{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01790_072.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1909 | mapsnap generated fit (2026-09-23)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-23"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"160"},{"label":"placed","value":"123"},{"label":"unplaced","value":"37"},{"label":"fit sources","value":"georef 71, georef-snap 41, snap:0 10, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"20 sheet(s) cut into 54 panels"},{"label":"unplaced pages","value":"p0a (tier 3, 41.81974,-87.81948 +/-2602m); p0b (tier 3, 41.81974,-87.81948 +/-2602m); p1 (tier 1, 41.89376,-87.86428 +/-256m); p115__1 (tier 1, 41.82092,-87.86738 +/-100m); p115__2 (tier 1, 41.81740,-87.86810 +/-245m); p115__4 (tier 1, 41.81037,-87.89522 +/-125m); p118__1 (tier 1, 41.81167,-87.89942 +/-260m); p118__3 (tier 1, 41.81228,-87.88523 +/-100m); p119__1 (tier 1, 41.94675,-87.85938 +/-100m); p119__2 (tier 1, 41.94503,-87.86283 +/-100m); p119__4 (tier 1, 41.94298,-87.86999 +/-100m); p123__1 (tier 4, 41.86490,-87.84265 +/-8348m); p123__3 (tier 4, 41.86490,-87.84265 +/-8348m); p124__1 (tier 1, 41.82032,-87.84498 +/-254m); p124__2 (tier 1, 41.82143,-87.86803 +/-100m); p13 (tier 1, 41.89867,-87.85376 +/-271m); p15__1 (tier 2, 41.88835,-87.84137 +/-1524m); p17 (tier 2, 41.89123,-87.84095 +/-100m); p18 (tier 2, 41.85986,-87.85682 +/-6975m); p2__2 (tier 1, 41.88498,-87.87374 +/-100m); p44 (tier 1, 41.85967,-87.84490 +/-271m); p47__2 (tier 3, 41.89023,-87.82759 +/-2602m); p53__3 (tier 1, 41.88718,-87.81643 +/-100m); p58__1 (tier 1, 41.87874,-87.79634 +/-142m); p58__2 (tier 2, 41.87923,-87.82329 +/-100m); p58__3 (tier 2, 41.87923,-87.82329 +/-100m); p82__1 (tier 2, 41.83218,-87.81706 +/-404m); p82__2 (tier 2, 41.83218,-87.81706 +/-404m); p82__4 (tier 2, 41.83218,-87.81706 +/-404m); p83__2 (tier 2, 41.82746,-87.81897 +/-100m); p84__2 (tier 2, 41.82098,-87.82182 +/-100m); p87__1 (tier 1, 41.81959,-87.81626 +/-192m); p88__1 (tier 4, 41.86490,-87.84265 +/-8348m); p88__2 (tier 4, 41.86490,-87.84265 +/-8348m); p88__3 (tier 4, 41.86490,-87.84265 +/-8348m); p89__1 (tier 2, 41.82273,-87.84277 +/-100m); p94__2 (tier 1, 41.81838,-87.85731 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p10","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0010","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1985.7 -0.0,1503.3 37.1,1509.6 38.7,171.8 74.2,183.3 98.9,191.2 104.0,0.0 1451.0,0.0 1451.0,1757.8 1252.6,1722.5 1248.6,2126.0 782.5,2126.0 -0.0,1985.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[551.0,338.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8541107,41.8928821]}},{"type":"Feature","properties":{"resourceCoords":[1058.0,497.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8528895,41.8926208]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p100","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0100","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"15.0,2043.8 6.1,49.2 502.4,51.0 499.9,0.0 1437.0,0.0 1437.0,1911.7 592.5,2126.0 589.6,2008.8 169.6,2004.5 15.0,2043.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0100/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87136220673221,41.819840419813204]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86782974447885,41.81994883664929]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86761602820182,41.8160264568552]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87114849045518,41.81591804001911]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p101","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0101","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1397.5,2126.0 70.7,2126.0 70.8,2083.3 30.0,2083.0 26.1,63.6 1089.0,65.7 1137.5,241.4 1130.7,1118.0 1397.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[30.0,566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8759382,41.8167753]}},{"type":"Feature","properties":{"resourceCoords":[30.0,2083.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8796788,41.8166798]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p102","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0102","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"273.7,2126.0 -0.0,1123.1 -0.0,63.6 1357.0,62.8 1357.0,563.0 1437.0,562.8 1437.0,619.1 1357.0,619.1 1357.1,2055.7 1437.0,2055.7 1437.0,2126.0 273.7,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1357.0,1075.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8770005,41.8122443]}},{"type":"Feature","properties":{"resourceCoords":[1357.0,563.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8757465,41.812269]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p103","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0103","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"276.7,2066.6 265.9,715.5 92.2,716.5 265.5,666.1 261.5,164.7 1199.1,157.9 1218.6,2061.2 276.7,2066.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[745.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8733693,41.8123158]}},{"type":"Feature","properties":{"resourceCoords":[745.0,1533.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8733965,41.8132894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p104","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0104","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1272.2,2084.7 189.0,2077.0 188.8,174.4 850.7,0.0 1274.0,0.0 1272.2,2084.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[189.0,1412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8722545,41.8135491]}},{"type":"Feature","properties":{"resourceCoords":[189.0,2077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8722043,41.812339]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p105","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0105","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"13.2,386.9 847.7,154.4 844.1,0.0 1363.8,0.0 1366.5,346.4 1437.0,611.0 1437.0,2126.0 36.0,2126.0 13.2,386.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0105/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86975463002008,41.8166824243444]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86617730697257,41.816730052460635]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8660834249378,41.812757660852924]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86966074798531,41.81271003273669]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p106","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0106","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,693.5 -0.0,-0.0 1437.0,0.0 1437.0,2126.0 61.2,2126.0 70.3,968.5 -0.0,693.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[126.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8660029,41.8152008]}},{"type":"Feature","properties":{"resourceCoords":[263.0,1690.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8656388,41.8142936]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p107","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0107","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1437.0,2015.3 -0.0,2013.2 -0.0,138.8 1437.0,138.1 1437.0,2015.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[485.0,1087.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8781544,41.8104893]}},{"type":"Feature","properties":{"resourceCoords":[485.0,2016.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8780952,41.8087939]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p108","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0108","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,153.6 1395.1,156.3 1388.6,2023.1 -0.0,2022.4 -0.0,153.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0108/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8756993160638,41.812551682693105]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87219046043256,41.81262615288679]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87204367813781,41.808729539713894]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87555253376905,41.808655069520206]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0109","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1322.3,110.2 1322.2,284.8 1437.0,285.3 1437.0,2106.1 -0.0,2109.6 -0.0,281.3 1092.5,282.5 1091.5,108.6 1322.3,110.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0109/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87229926141184,41.81286397298228]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86871610599262,41.81293056619216]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86858484883258,41.808951459575674]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8721680042518,41.808884866365794]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p11","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0011","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"197.3,1613.8 181.4,0.0 1346.8,0.0 1395.5,1789.8 1451.0,1789.2 1451.0,2126.0 231.1,2126.0 -0.0,2061.6 -0.0,1580.7 197.3,1613.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[808.0,678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8504387,41.8920919]}},{"type":"Feature","properties":{"resourceCoords":[1314.0,834.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8492146,41.8918248]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p110","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0110","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"116.5,311.4 -0.0,310.9 -0.0,133.8 1185.3,141.8 1186.3,0.0 1437.0,0.0 1437.0,2126.0 116.9,2126.0 116.5,311.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0110/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86900339080925,41.812965527361726]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86547384197402,41.813030509154544]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86534576072943,41.80911094001685]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86887530956466,41.80904595822403]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p111","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0111","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,42.1 1395.0,45.5 1395.1,0.0 1437.0,0.0 1437.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[494.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8779959,41.8068427]}},{"type":"Feature","properties":{"resourceCoords":[974.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8767695,41.8068673]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p112","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0112","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"8.4,2126.0 -0.0,27.1 1416.8,22.7 1420.9,2126.0 8.4,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0112/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87560124556438,41.808894933850375]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87201276219211,41.80896144618027]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87188167259025,41.80497617536275]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87547015596252,41.80490966303285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p113","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0113","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1437.0,2126.0 79.0,2126.0 63.5,13.3 1437.0,2.6 1437.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0113/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87221992686125,41.80894030249324]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86866025776345,41.80899182393828]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86855871369505,41.80503855747515]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87211838279285,41.80498703603011]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p114","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0114","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.7,5.2 1443.0,0.0 1443.0,2126.0 81.6,2126.0 90.7,5.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0114/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86888322450474,41.808992638191185]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86533724864965,41.809055307119564]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86521424735396,41.805133626567965]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86876022320905,41.805070957639586]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p115 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"3174.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2598.0"},{"label":"split_canvas_h","value":"4353.2"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1443.0,0.0 1174.5,0.0 975.0,380.8 793.5,1082.1 1443.0,1088.3 1443.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[793.5,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86210627844639,41.80711981681041]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86051579229611,41.80718817370869]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,1088.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86036211708142,41.805206010144296]}},{"type":"Feature","properties":{"resourceCoords":[793.5,1088.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8619526032317,41.80513765324602]}},{"type":"Feature","properties":{"resourceCoords":[1052.3,1043.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8613246,41.8052469]}},{"type":"Feature","properties":{"resourceCoords":[1052.3,1043.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8604174,41.805267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p115 [5]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"1400.8"},{"label":"split_canvas_y","value":"6184.0"},{"label":"split_canvas_w","value":"1762.4"},{"label":"split_canvas_h","value":"2320.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"740.0,2126.0 749.2,1546.9 516.8,1551.9 350.2,1555.5 357.2,2126.0 740.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0115__5/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[350.2,1546.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.88035325504906,41.81138611071851]}},{"type":"Feature","properties":{"resourceCoords":[790.8,1546.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87927333059373,41.81141994246865]}},{"type":"Feature","properties":{"resourceCoords":[790.8,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87921356932479,41.810362451082405]}},{"type":"Feature","properties":{"resourceCoords":[350.2,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.88029349378012,41.81032861933226]}},{"type":"Feature","properties":{"resourceCoords":[715.9,2070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.879403,41.8104588]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p116","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0116","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1443.0,0.0 1443.0,2126.0 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0116/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.90317673639527,41.80903539471545]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.89962416595705,41.809136613878515]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.89942550112487,41.80520764758488]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.90297807156308,41.805106428421816]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p117","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0117","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1443.0,2126.0 -0.0,2126.0 -0.0,-0.0 1443.0,0.0 1443.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0117/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.90483747515287,41.813125534060326]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.9012447039147,41.81308542772818]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.90132342621165,41.80911224432896]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.90491619744982,41.8091523506611]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0118__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p118 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"3606.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2166.0"},{"label":"split_canvas_h","value":"3911.2"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0118__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0118","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"901.5,0.0 930.5,977.8 1028.2,977.7 1443.0,977.6 1443.0,-0.0 901.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0118__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[926.5,100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9063481,41.8098744]}},{"type":"Feature","properties":{"resourceCoords":[926.5,930.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9083694,41.8098314]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p119 [3]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"3448.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2323.6"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1392.5,162.6 999.4,0.0 908.0,0.0 907.8,120.2 862.1,122.5 862.2,602.7 862.3,1127.0 862.4,2019.0 862.5,2126.0 1391.5,2126.0 1391.4,1991.0 1392.5,162.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[904.1,1921.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8702275,41.9330782]}},{"type":"Feature","properties":{"resourceCoords":[1392.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8691398,41.9363842]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p119 [5]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"1410.0"},{"label":"split_canvas_y","value":"2392.4"},{"label":"split_canvas_w","value":"2039.2"},{"label":"split_canvas_h","value":"2115.6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"824.6,1004.3 862.3,1006.1 862.2,602.7 542.1,599.8 352.5,598.1 359.4,903.3 819.3,1107.9 824.6,1004.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__5/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[352.5,598.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87159781753225,41.9373305429958]}},{"type":"Feature","properties":{"resourceCoords":[862.3,598.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87035173838645,41.937404174181374]}},{"type":"Feature","properties":{"resourceCoords":[862.3,1127.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87024916062178,41.93644184161706]}},{"type":"Feature","properties":{"resourceCoords":[352.5,1127.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87149523976758,41.93636821043149]}},{"type":"Feature","properties":{"resourceCoords":[826.3,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8703676,41.9367226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__6/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p119 [6]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3604.4"},{"label":"split_canvas_w","value":"3450.0"},{"label":"split_canvas_h","value":"4899.6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__6/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 185.0,2126.0 862.5,2126.0 862.4,2019.0 862.3,1127.0 359.4,903.3 0.0,901.1 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0119__6/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,901.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86210180455656,41.938999437418786]}},{"type":"Feature","properties":{"resourceCoords":[862.5,901.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85999041773916,41.93905573852146]}},{"type":"Feature","properties":{"resourceCoords":[862.5,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85988295654428,41.93682169984791]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86199434336169,41.93676539874524]}},{"type":"Feature","properties":{"resourceCoords":[55.0,2075.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8618641,41.936862]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0012","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"870.8,1984.6 49.7,1974.2 55.0,1781.7 -0.0,1780.8 -0.0,-0.0 1451.0,0.0 1451.0,2126.0 868.0,2126.0 870.8,1984.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0012/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84916864991109,41.89335617902277]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84564454985028,41.8934697049517]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84542266663694,41.889598817502]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84894676669775,41.88948529157307]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p120","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0120","type":"ImageService3","width":1443,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"67.7,176.6 -0.0,149.4 -0.0,-0.0 1443.0,0.0 1443.0,1949.3 1186.8,1950.0 1188.2,2126.0 83.9,2126.0 67.7,176.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0120/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8693163260788,41.9367079628918]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86575490046873,41.936766517740004]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86563974409154,41.93283561225776]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86920116970161,41.93277705740956]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p121","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0121","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"272.4,0.0 1438.0,0.0 1438.0,511.4 1362.2,512.1 1373.1,2126.0 -0.0,2126.0 -0.0,1635.5 258.6,1637.0 272.4,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0121/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.866403182771,41.93614628061597]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86288747890121,41.93622629532391]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8627295729023,41.932332328650354]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86624527677208,41.93225231394241]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p122","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0122/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0122","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1615.9 55.6,1616.5 60.8,0.0 1438.0,0.0 1438.0,2126.0 -0.0,2126.0 -0.0,1615.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1076.0,1149.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8604298,41.9332582]}},{"type":"Feature","properties":{"resourceCoords":[565.0,614.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8617367,41.9341983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0123__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p123 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5692.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0123__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0123","type":"ImageService3","width":1423,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.0,2126.0 1423.0,0.0 1005.4,0.0 983.2,211.9 914.9,711.7 0.0,712.5 -0.0,2126.0 1423.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0123__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84211598052273,41.93203229951553]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83865276624962,41.93172489892441]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83926960123806,41.927872495314276]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84273281551117,41.928179895905394]}},{"type":"Feature","properties":{"resourceCoords":[749.0,1361.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8406879,41.9294043]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0014","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"421.7,1916.3 -0.0,1843.8 -0.0,-0.0 1451.0,0.0 1451.0,2126.0 419.2,2126.0 421.7,1916.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0014/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84544599550252,41.89265755637104]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84187633715545,41.89275676033825]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84168244797446,41.88883578770462]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84525210632152,41.88873658373741]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0015__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p15 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1925.2"},{"label":"split_canvas_h","value":"4225.6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0015__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0015","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 0.0,1056.4 481.3,1056.1 474.3,0.0 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0015__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[46.0,97.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8462051,41.8771873]}},{"type":"Feature","properties":{"resourceCoords":[457.3,97.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.844964,41.8770711]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0016","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,-0.0 490.9,0.0 498.0,1656.0 967.5,1660.1 964.0,715.1 1438.2,716.6 1442.2,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0016/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84082955335445,41.89671173828031]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83710679659187,41.89678389949958]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83696575034047,41.89269507310882]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84068850710307,41.892622911889546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p19","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"5"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0019","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2063.4 22.9,65.9 1451.0,43.9 1451.0,1024.3 1264.8,1045.9 1140.6,1850.1 1142.4,2126.0 1107.8,2042.5 -0.0,2063.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[644.0,1050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8392883,41.8897213]}},{"type":"Feature","properties":{"resourceCoords":[919.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8368564,41.8892476]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0020","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 4.1,5.4 1012.9,14.4 1012.6,99.5 1132.6,100.5 1133.4,0.0 1451.0,0.0 1451.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83692860073438,41.89087778281037]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83341422461469,41.89096051260913]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83325253785824,41.88710015574843]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83676691397794,41.88701742594967]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p21","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0021","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1367.0,123.2 1298.3,2126.0 -0.0,2126.0 0.0,-0.0 1392.3,24.2 1367.0,123.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[356.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8590303,41.8880771]}},{"type":"Feature","properties":{"resourceCoords":[860.0,31.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8579007,41.8901832]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p22","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0022","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,55.0 1361.0,41.0 1373.1,2126.0 -0.0,2126.0 -0.0,55.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[862.0,1393.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8576576,41.8839844]}},{"type":"Feature","properties":{"resourceCoords":[862.0,384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8577115,41.8858002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p23","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0023","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"57.8,1930.4 -0.0,1932.4 18.6,0.0 505.1,0.0 509.1,147.2 1228.4,255.0 1450.0,248.9 1450.0,288.1 1398.4,280.5 1450.0,2126.0 64.0,2126.0 57.8,1930.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[494.0,1100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8553711,41.8880597]}},{"type":"Feature","properties":{"resourceCoords":[961.0,1100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8541448,41.8880578]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0024","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,2055.6 85.7,2059.1 110.9,51.7 167.1,62.2 168.8,19.7 385.2,22.6 383.3,102.8 578.3,139.4 623.6,201.5 613.5,172.4 1337.5,189.2 1322.1,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85326144887817,41.88974591666055]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84978328564242,41.88984672936539]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84958612542349,41.88602344631377]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85306428865924,41.885922633608935]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p25","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0025","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,133.5 497.5,141.0 499.6,0.0 1327.9,0.0 1326.9,143.6 1450.0,142.0 1450.0,2078.3 -0.0,2084.8 -0.0,133.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[862.0,2080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8478162,41.8860535]}},{"type":"Feature","properties":{"resourceCoords":[862.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.847898,41.8880531]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0026","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"756.0,0.0 809.9,0.0 812.4,336.5 1244.1,407.6 1239.6,2076.8 294.2,2076.9 292.6,151.6 757.9,145.5 756.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84725720501874,41.889820520856034]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84376735697941,41.88989855933742]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84361473632961,41.88606243616103]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84710458436894,41.88598439767965]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0027","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1431.0,2060.2 -0.0,2071.8 -0.0,842.0 127.9,43.7 166.7,20.5 1450.0,-0.0 1431.0,2060.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83915805070444,41.88883493036819]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83908931062281,41.88617850246535]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84428447711399,41.886102941217274]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84435321719562,41.888759369120116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0028","type":"ImageService3","width":1450,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"84.4,1867.8 96.9,60.0 1450.0,109.8 1450.0,2126.0 -0.0,2126.0 -0.0,1866.7 84.4,1867.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0028/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85675422176374,41.88616001549761]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85315101538997,41.88625395239896]}},{"type":"Feature","properties":{"resourceCoords":[1450.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85296731258549,41.88229299568167]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85657051895926,41.882199058780316]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p29","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0029","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"930.5,2095.8 930.5,2126.0 837.0,2126.0 837.4,2090.1 253.5,2085.5 261.7,94.4 289.6,95.6 289.6,162.7 1370.0,169.9 1351.0,2094.1 930.5,2095.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1130.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8515249,41.8841396]}},{"type":"Feature","properties":{"resourceCoords":[860.0,166.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8516193,41.885958]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p2 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5804.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0002","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1451.0,688.4 955.7,675.0 955.8,0.0 -0.0,0.0 -0.0,2126.0 1451.0,2126.0 1451.0,688.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[920.0,1530.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8675141,41.887545]}},{"type":"Feature","properties":{"resourceCoords":[708.0,32.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8638187,41.888018]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0003","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.9,1747.1 -0.0,-0.0 1451.0,0.0 1451.0,2126.0 1.9,1747.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8641875315334,41.89808558875562]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86055859046257,41.89818717698137]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86036002390873,41.89420143768838]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86398896497955,41.894099849462634]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p30","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0030","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.9,75.2 1441.0,77.6 1441.0,2092.3 1076.3,2089.7 1046.2,2126.0 1046.2,2089.4 40.0,2082.0 54.9,75.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[566.0,1079.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8489972,41.8842056]}},{"type":"Feature","properties":{"resourceCoords":[40.0,2082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8501869,41.8823568]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p31","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0031","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1196.8,2076.7 92.9,2077.4 83.6,79.1 1441.0,83.3 1441.0,2078.0 1243.4,2076.7 1244.1,2126.0 1173.9,2126.0 1196.8,2076.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[746.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8452598,41.8843032]}},{"type":"Feature","properties":{"resourceCoords":[746.0,2077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.845182,41.8824682]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0032","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,895.6 1441.0,2059.8 1093.0,2063.6 1093.3,2126.0 -0.0,2126.0 -0.0,0.0 1153.2,-0.0 1153.6,62.0 1329.6,61.2 1331.9,896.4 1441.0,895.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0032/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83528494299932,41.885073523317274]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83521101118666,41.882447820414015]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84037779288977,41.88236603885515]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84045172470243,41.88499174175841]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0033","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"107.6,2062.4 100.0,313.1 -0.0,313.1 0.0,-0.0 1451.0,0.0 1451.0,2067.6 1103.8,2064.8 1100.8,1070.0 599.9,1068.5 603.6,2066.7 107.6,2062.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0033/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83983238187123,41.89730138823392]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8363086848551,41.89736950539276]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83617555818964,41.89349887479454]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83969925520577,41.8934307576357]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p34","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0034","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,173.6 833.2,176.8 833.6,0.0 1441.0,0.0 1441.0,2126.0 -0.0,2126.0 -0.0,173.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[342.0,1675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8364598,41.8799071]}},{"type":"Feature","properties":{"resourceCoords":[1340.0,1675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8340292,41.8799577]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0035","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,2126.0 -0.0,2126.0 -0.0,180.3 1441.0,172.2 1441.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0035/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85522659245505,41.88258405762262]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85150030237871,41.88266081291693]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85134927133366,41.878538724220036]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85507556141,41.87846196892573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p36","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0036","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,55.1 1441.0,62.8 1441.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[958.0,1059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8488336,41.8805722]}},{"type":"Feature","properties":{"resourceCoords":[958.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.848749,41.8787587]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p37","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0037","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,81.0 1439.5,2126.0 -0.0,2126.0 -0.0,84.7 1441.0,81.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0037/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8476743,41.8825656]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8441391,41.8826413]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84398910000002,41.878758000000005]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8475243,41.8786823]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p38","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0038","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,2065.6 -0.0,2059.4 -0.0,218.5 167.0,218.8 166.0,0.0 1396.5,0.0 1398.0,322.1 1441.0,322.3 1441.0,2065.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[947.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.841285,41.8789155]}},{"type":"Feature","properties":{"resourceCoords":[488.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8424986,41.8788911]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0039","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,2126.0 -0.0,2126.0 -0.0,0.0 1441.0,-0.0 1441.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85055374454437,41.89982053129082]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85048672835255,41.89721033916586]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.855623845374,41.89713621986392]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85569086156582,41.89974641198888]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0004","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1451.0,0.0 1451.0,2048.4 653.3,2033.0 650.9,2126.0 560.1,2126.0 -0.0,1964.8 -0.0,-0.0 1451.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86043729163036,41.897790965074115]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85687066534054,41.89785658381563]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85674240641653,41.89393925879332]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86030903270635,41.8938736400518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p40","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0040","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1043.2 313.1,1043.1 310.2,542.0 655.5,543.6 654.0,0.0 1439.0,0.0 1439.0,2126.0 1320.0,2126.0 1319.5,2041.0 -0.0,2041.0 -0.0,1043.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[816.0,2041.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8357043,41.8908887]}},{"type":"Feature","properties":{"resourceCoords":[319.0,2041.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8369183,41.8908682]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0041","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1268.7,566.5 1264.8,2126.0 -0.0,2126.0 2.7,-0.0 88.9,0.0 85.8,554.2 1268.7,566.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84404151627976,41.879877660157355]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84054985602545,41.879963263371955]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84038120089423,41.876094898536685]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84387286114854,41.876009295322085]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0042","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,45.5 387.7,48.2 387.8,0.0 1439.0,0.0 1439.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84092140728211,41.87900500943601]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83743558679447,41.87908392671038]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83728009333875,41.87522230335625]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84076591382639,41.87514338608188]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0043","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,28.6 1439.0,0.0 1439.0,2126.0 -0.0,2126.0 -0.0,28.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83640119722777,41.87914326186281]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8328233380398,41.879214458235914]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83268305830794,41.87525084636908]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8362609174959,41.87517964999597]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0045","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.0,2126.0 -0.0,2126.0 -0.0,-0.0 1439.0,0.0 1439.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8387120680534,41.869039245085446]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83524460827056,41.8691127880709]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83509974834091,41.86527032810699]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83856720812373,41.86519678512153]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0046","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.0,2126.0 -0.0,2126.0 -0.0,559.2 -0.0,559.2 -0.0,0.0 1439.0,-0.0 1439.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0046/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83613644126953,41.87505664231546]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83605084371464,41.872445537102514]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84119528016917,41.87235070555092]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84128087772406,41.874961810763864]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0047__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p47 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5756.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0047__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0047","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 1439.0,2065.6 1434.5,0.0 994.8,0.0 994.6,291.6 376.3,842.6 0.0,840.6 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0047__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82916520718899,41.89188806818439]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82562947314594,41.891901237584776]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82560351977901,41.88798511013795]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82913925382205,41.887971940737565]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0048","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2059.7 -0.0,102.7 1439.0,110.1 1439.0,2099.6 -0.0,2059.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0048/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82540933562397,41.89192612204465]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82184873877802,41.892021103088894]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82166155728547,41.88807742216832]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82522215413142,41.88798244112408]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p49","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0049","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.0,2126.0 -0.0,2117.4 -0.0,-0.0 1439.0,0.0 1439.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[757.0,2074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8196436,41.8882395]}},{"type":"Feature","properties":{"resourceCoords":[757.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8197579,41.8918643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p5","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0005","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1451.0,0.0 1451.0,2126.0 0.0,2126.0 0.0,-0.0 1451.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[510.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8429681,41.855575]}},{"type":"Feature","properties":{"resourceCoords":[510.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8453537,41.8555169]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p50","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0050","type":"ImageService3","width":1439,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.0,0.0 1439.0,2064.7 -0.0,2066.0 -0.0,-0.0 1439.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1230.0,2066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8147682,41.8883421]}},{"type":"Feature","properties":{"resourceCoords":[1230.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8149013,41.8919719]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p51","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0051","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 1441.0,-0.0 1441.0,954.3 1378.8,2126.0 -0.0,2126.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[761.0,1505.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8085655,41.890739]}},{"type":"Feature","properties":{"resourceCoords":[761.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.805119,41.8908098]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p52","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0052","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 82.0,-0.0 1441.0,-0.0 1390.3,2126.0 1349.6,2126.0 1350.0,2061.9 690.8,2050.7 639.0,2056.0 638.4,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[639.0,2056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8098253,41.888456]}},{"type":"Feature","properties":{"resourceCoords":[639.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8050418,41.8885873]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p53 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3004.8"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.4,1873.4 52.0,2083.0 701.5,2085.4 701.3,2126.0 751.2,2126.0 751.2,1364.5 751.1,73.7 102.9,66.5 52.0,72.0 51.9,140.8 -0.0,141.1 -0.0,1873.2 51.4,1873.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[52.0,2083.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8147682,41.8883421]}},{"type":"Feature","properties":{"resourceCoords":[52.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8098253,41.888456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p53 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"3004.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2759.6"},{"label":"split_canvas_h","value":"5458.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,62.6 782.1,64.0 784.9,1316.2 751.2,1316.3 751.2,1364.5 1441.0,1364.5 1441.0,62.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0053__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[782.1,639.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8161611,41.8883161]}},{"type":"Feature","properties":{"resourceCoords":[782.1,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8147682,41.8883421]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p54 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2825.2"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 -0.0,1873.7 662.3,1862.0 685.5,1843.7 694.3,1066.2 682.2,0.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[662.3,1862.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8234066,41.8869185]}},{"type":"Feature","properties":{"resourceCoords":[662.3,286.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8195925,41.8869514]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p54 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"2728.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3035.2"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,2126.0 1438.4,114.6 732.2,129.0 728.0,860.7 692.0,860.8 693.7,1015.0 727.1,1015.9 720.8,2126.0 1441.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0054__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.2,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8255001,41.8880986]}},{"type":"Feature","properties":{"resourceCoords":[732.2,129.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8234549,41.8881505]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0055","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,2106.4 -0.0,2126.0 -0.0,-0.0 1441.0,0.0 1441.0,2106.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0055/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82622954201226,41.88675479483168]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82272119307169,41.8868240437132]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82258492293398,41.88294331388283]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82609327187456,41.88287406500132]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p56","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0056","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6.6,27.8 1441.0,27.6 1441.0,2126.0 -0.0,2126.0 6.6,27.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1372.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8226252,41.8811014]}},{"type":"Feature","properties":{"resourceCoords":[710.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8241742,41.8792488]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0057","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,0.0 1441.0,2040.0 101.4,2047.5 102.2,2126.0 9.7,2126.0 -0.0,-0.0 1441.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0057/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82580196785516,41.89578164218215]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82199875709706,41.89585236501324]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82185956722327,41.89164605819415]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82566277798136,41.89157533536306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0059","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1338.7,10.8 1345.2,799.5 1441.0,901.2 1440.8,2092.3 314.0,2081.8 313.6,2126.0 -0.0,2126.0 -0.0,-0.0 1338.7,10.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81558127038564,41.88689837392471]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81204213576262,41.88696934642682]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81190247356918,41.88305457058664]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81544160819219,41.88298359808453]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0006","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2072.3 -0.0,-0.0 1451.0,0.0 1451.0,2050.4 -0.0,2072.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8506208158789,41.89711121415139]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84709702290851,41.89714248814031]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.84703589518212,41.89327216598961]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8505596881525,41.893240892000684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0060","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.4,895.8 -0.0,792.5 -0.0,-0.0 1441.0,0.0 1441.0,921.2 1362.7,920.0 1094.2,1406.6 1019.4,1723.3 1006.2,2105.7 85.2,2092.1 95.4,895.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0060/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81229277096219,41.88694453393775]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80877093539378,41.887037140466596]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80858870085169,41.8831415029461]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8121105364201,41.88304889641726]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p61","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0061","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"273.8,2126.0 181.6,2126.0 221.8,2103.7 238.2,-0.0 1083.0,-0.0 1090.8,1615.3 266.5,1628.3 273.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1200.0,605.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8062392,41.8853869]}},{"type":"Feature","properties":{"resourceCoords":[1200.0,1703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8089055,41.8853459]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p62","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0062","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"926.1,2037.7 430.1,1898.6 -0.0,1620.6 -0.0,0.0 1441.0,-0.0 1441.0,68.7 1325.1,68.6 1313.8,2047.4 926.1,2037.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[114.0,611.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8062392,41.8853869]}},{"type":"Feature","properties":{"resourceCoords":[713.0,1691.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8088248,41.8842537]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p63","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0063","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1295.2,48.8 1298.0,316.0 1441.0,315.2 1441.0,964.5 1441.0,1532.8 1395.5,1533.2 1400.0,2019.5 -0.0,2030.8 -0.0,49.0 1295.2,48.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[571.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8132695,41.8830955]}},{"type":"Feature","properties":{"resourceCoords":[53.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8144559,41.8794565]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p64","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0064","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,298.9 -0.0,28.3 1441.0,40.6 1441.0,2029.5 1231.4,2029.7 1232.1,2126.0 1208.2,2126.0 1208.4,2028.2 85.3,2025.5 86.0,1533.0 132.1,1533.1 144.9,299.6 -0.0,298.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[228.0,300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8109176,41.882644]}},{"type":"Feature","properties":{"resourceCoords":[86.0,1533.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8111774,41.8804096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0065","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,1990.7 175.9,1993.5 171.0,39.9 1441.0,47.7 1441.0,1990.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0065/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80841444071253,41.88323968466936]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80488151592948,41.88330853233825]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80474604284247,41.87940040088685]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80827896762551,41.879331553217966]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p66","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0066","type":"ImageService3","width":1441,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.4,2076.0 355.7,1584.3 -0.0,1581.1 0.0,0.0 391.0,0.0 390.0,87.6 1425.8,93.8 1426.8,2079.1 242.4,2076.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[580.0,590.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8140809,41.8785394]}},{"type":"Feature","properties":{"resourceCoords":[242.0,2076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8148066,41.8757874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p67","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0067","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"987.6,2126.0 987.8,2071.0 26.9,2071.1 20.9,132.2 1446.0,130.7 1446.0,2126.0 987.6,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[504.0,1113.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8107375,41.8776746]}},{"type":"Feature","properties":{"resourceCoords":[504.0,2071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8106727,41.8758698]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0068","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,2126.0 -0.0,2126.0 -0.0,104.8 1446.0,115.4 1446.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0068/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80837395346195,41.879765910127425]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80478906222612,41.87986319190641]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80459831097556,41.875911072765405]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8081832022114,41.87581379098642]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p69 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5784.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.1,2126.0 908.1,2126.0 905.7,1533.8 1241.1,1004.4 1446.0,1000.5 1446.0,-0.0 48.9,9.4 49.1,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[49.0,1006.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8118799,41.8758457]}},{"type":"Feature","properties":{"resourceCoords":[49.0,2008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8143244,41.8757972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p69 [2]","metadata":[{"label":"streets","value":"1"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3622.8"},{"label":"split_canvas_y","value":"4002.0"},{"label":"split_canvas_w","value":"2161.2"},{"label":"split_canvas_h","value":"4502.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,2126.0 1446.0,1220.7 1143.1,1159.1 905.7,1533.8 908.1,2126.0 1446.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0069__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[905.7,1000.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8139914514152,41.8768375489425]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,1000.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8139160383884,41.87486383350233]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81943340199143,41.8747469692847]}},{"type":"Feature","properties":{"resourceCoords":[905.7,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81950881501824,41.876720684724866]}},{"type":"Feature","properties":{"resourceCoords":[1188.3,1076.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8143244,41.8757972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0007","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"313.4,0.0 1425.5,269.8 1451.0,2126.0 -0.0,2126.0 -0.0,-0.0 313.4,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0007/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86500450201474,41.894832117582226]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86151042935124,41.89489322662448]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86139099075372,41.89105540831953]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86488506341722,41.890994299277274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0070","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,782.1 1446.0,2126.0 -0.0,2126.0 -0.0,165.9 791.8,184.6 796.2,-0.0 1405.5,-0.0 1388.2,746.9 1446.0,782.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81416959549179,41.874714814721706]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81399220288436,41.872077659241555]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.819162746761,41.87188207900846]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81934013936842,41.874519234488616]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p71","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0071","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2082.2 -0.0,2021.8 1113.4,108.0 1376.5,109.1 1377.3,2089.8 -0.0,2082.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-36.0,2082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8185027,41.8684139]}},{"type":"Feature","properties":{"resourceCoords":[1113.0,108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8158158,41.8721144]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p72","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0072","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2118.4 -0.0,106.2 480.0,108.4 478.0,0.0 1367.2,0.0 1366.9,112.3 1394.5,112.5 1385.5,2126.0 -0.0,2118.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1390.0,1119.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8117042,41.8703724]}},{"type":"Feature","properties":{"resourceCoords":[395.0,108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.814204,41.8721472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p73","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0073","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,2090.8 23.7,2086.5 26.5,148.2 -0.0,148.1 -0.0,-0.0 1446.0,0.0 1446.0,2090.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[508.0,1118.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8104829,41.8703963]}},{"type":"Feature","properties":{"resourceCoords":[508.0,2088.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8104122,41.8685695]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0074","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,2061.9 7.0,2084.1 -0.0,-0.0 1446.0,0.0 1446.0,2061.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80804405841013,41.87253189313042]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80442127793741,41.87255971385944]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80436673297112,41.868565366946314]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80798951344384,41.8685375462173]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p75","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0075","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,699.4 1335.0,699.3 1337.3,1375.7 1446.0,1376.0 1446.0,2048.2 1339.7,2048.4 1339.9,2126.0 -0.0,2126.0 0.0,-0.0 1446.0,19.2 1446.0,699.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[411.0,698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8188753,41.8671871]}},{"type":"Feature","properties":{"resourceCoords":[411.0,1373.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8188356,41.8659722]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0076","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"105.7,2038.6 108.0,1375.2 -0.0,1374.5 -0.0,706.9 110.3,707.4 112.6,36.2 1446.0,39.3 1446.0,1046.6 1213.2,1046.6 1213.5,2096.7 -0.0,2126.0 -0.0,2038.4 105.7,2038.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81669049437023,41.86851431039481]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81317462128501,41.86858806608086]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8130300257325,41.86471135267484]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81654589881772,41.864637596988786]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p77","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0077","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"232.6,25.4 1365.4,27.8 1366.8,2088.7 -0.0,2093.6 -0.0,1038.0 232.3,1038.0 232.6,25.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[862.0,1038.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8115696,41.8667115]}},{"type":"Feature","properties":{"resourceCoords":[1366.0,1038.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8103419,41.8667371]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p78","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0078","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.8,2100.9 108.3,14.1 1446.0,16.8 1446.0,1036.9 1446.0,2050.4 1296.2,2051.1 1296.2,2101.6 109.8,2100.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[613.0,1037.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8091295,41.8667623]}},{"type":"Feature","properties":{"resourceCoords":[109.0,1037.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8103419,41.8667371]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p79","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0079","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"321.2,2081.8 -0.0,2081.5 -0.0,2031.4 148.6,2030.9 149.4,14.5 1446.0,0.0 1446.0,2126.0 321.1,2122.9 321.2,2081.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[321.0,1026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8067083,41.8668128]}},{"type":"Feature","properties":{"resourceCoords":[1325.0,1026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8042725,41.8668642]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p8","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0008","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"196.2,0.0 1451.0,377.8 1451.0,2126.0 -0.0,2126.0 -0.0,1823.5 52.1,1824.2 48.5,0.0 196.2,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[552.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8603306,41.89419]}},{"type":"Feature","properties":{"resourceCoords":[1058.0,247.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8590968,41.8939529]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0080","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1436.0,91.6 1446.0,2126.0 -0.0,2126.0 -0.0,88.6 1436.0,91.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0080/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81384118342231,41.86509162242092]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80659844114075,41.86525067838705]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80628664292362,41.8572639428707]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81352938520519,41.85710488690457]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p81 [1]","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"14"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5784.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,1795.0 1446.0,0.0 610.9,0.0 610.9,975.5 0.0,975.5 -0.0,2126.0 1204.4,2126.0 1356.0,2092.9 1257.7,1850.7 1446.0,1795.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[183.0,1883.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.824762,41.8272822]}},{"type":"Feature","properties":{"resourceCoords":[183.0,1647.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8247936,41.8281456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p81 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2443.6"},{"label":"split_canvas_h","value":"3902.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"610.9,975.5 610.9,-0.0 -0.0,-0.0 -0.0,975.5 610.9,975.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0081__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8130007801567,41.83427124680282]}},{"type":"Feature","properties":{"resourceCoords":[610.9,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81150342834398,41.834253303300294]}},{"type":"Feature","properties":{"resourceCoords":[610.9,975.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81154188544714,41.832474281309395]}},{"type":"Feature","properties":{"resourceCoords":[0.0,975.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81303923725986,41.83249222481192]}},{"type":"Feature","properties":{"resourceCoords":[224.0,612.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8124768,41.833148]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0082__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p82 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"4131.6"},{"label":"split_canvas_y","value":"7370.0"},{"label":"split_canvas_w","value":"1652.4"},{"label":"split_canvas_h","value":"1134.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0082__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0082","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.0,1842.5 1038.2,1950.9 1032.9,2126.0 1446.0,2126.0 1446.0,1842.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0082__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1032.9,1842.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81049213795151,41.831483782814026]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,1842.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80947746467609,41.83148962956977]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80947207777638,41.83097138080059]}},{"type":"Feature","properties":{"resourceCoords":[1032.9,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8104867510518,41.83096553404485]}},{"type":"Feature","properties":{"resourceCoords":[1262.4,2051.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8099241,41.8311054]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0083__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p83 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5784.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0083__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0083","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 -0.0,2119.9 158.2,2110.2 270.4,2084.3 267.2,2126.0 405.0,2126.0 551.7,2126.0 595.7,1914.2 1349.9,1336.7 1446.0,1304.5 1446.0,1301.4 1446.0,-0.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0083__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[143.0,958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8139096,41.828191]}},{"type":"Feature","properties":{"resourceCoords":[459.0,958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8134886,41.8270983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0084__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p84 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4079.6"},{"label":"split_canvas_w","value":"2052.4"},{"label":"split_canvas_h","value":"4424.4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0084__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0084","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"504.1,2126.0 513.1,1397.0 139.2,1122.2 0.0,1156.9 0.0,2126.0 504.1,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0084__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1019.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82307315345628,41.82666545656914]}},{"type":"Feature","properties":{"resourceCoords":[513.1,1019.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82187661643661,41.82646661596217]}},{"type":"Feature","properties":{"resourceCoords":[513.1,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82244835639823,41.82452888631798]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82364489341789,41.82472772692495]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p85","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0085","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1448.0,0.0 1448.0,75.2 1386.8,78.2 1440.5,278.2 1448.0,2126.0 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0085/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82467467110982,41.82102811929172]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82100509271795,41.82107613743056]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82091115727405,41.81703241443781]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82458073566592,41.81698439629897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p86","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0086","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.5,2126.0 54.2,292.9 -0.0,10.3 1448.0,0.0 1448.0,149.1 1368.7,149.6 1371.5,575.8 1448.0,568.1 1448.0,2126.0 50.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[610.0,666.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8196123,41.8197496]}},{"type":"Feature","properties":{"resourceCoords":[610.0,2088.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8195303,41.8171302]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0087__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p87 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5792.0"},{"label":"split_canvas_h","value":"3576.4"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0087__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0087","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1448.0,0.0 0.0,-0.0 -0.0,431.0 78.0,423.8 74.9,894.0 1448.0,891.4 1448.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0087__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81776636303573,41.82073216132143]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81425334838487,41.82081155153237]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,894.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81418803716011,41.819183766680204]}},{"type":"Feature","properties":{"resourceCoords":[0.0,894.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81770105181097,41.819104376469255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0089__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p89 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5792.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0089__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0089","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 0.0,1645.8 385.1,1645.4 390.8,2126.0 1004.0,2126.0 1413.9,2126.0 1425.1,0.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0089__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1414.0,1560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8489706,41.8248876]}},{"type":"Feature","properties":{"resourceCoords":[1414.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8490137,41.8257981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p9","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0009","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,1943.3 299.4,1932.5 236.4,188.8 -0.0,120.1 -0.0,5.1 1451.0,0.0 1451.0,532.2 1391.0,514.5 1424.3,1835.3 1387.5,1830.1 1395.4,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[338.0,218.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8578917,41.8936904]}},{"type":"Feature","properties":{"resourceCoords":[1391.0,515.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.855345,41.8931539]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p90","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0090","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1448.0,0.0 1448.0,2050.3 1056.9,2052.7 1040.6,2126.0 969.4,2052.7 -0.0,2048.6 -0.0,-0.0 1448.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[978.0,1048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8465636,41.8258598]}},{"type":"Feature","properties":{"resourceCoords":[491.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8478535,41.8276586]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p91","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0091","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"20.6,0.0 47.8,0.0 48.5,60.6 1025.0,54.0 1097.5,127.0 1113.2,53.1 1118.8,1296.8 1448.0,1207.9 1433.7,2126.0 -0.0,2126.0 20.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[426.0,1766.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8478216,41.8208963]}},{"type":"Feature","properties":{"resourceCoords":[1025.0,54.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8464865,41.8240273]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p92","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0092","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"309.5,2126.0 327.9,1215.5 -0.0,1302.4 -0.0,65.2 412.9,60.0 413.1,0.0 1448.0,0.0 1448.0,2126.0 309.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[313.0,1499.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8453908,41.821444]}},{"type":"Feature","properties":{"resourceCoords":[908.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.844055,41.8240948]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p93","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0093","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1179.8,0.0 1182.7,912.5 1448.0,937.6 1448.0,2126.0 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0093/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86024838673822,41.81881588576239]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8567521790459,41.818906273827295]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.85657535832104,41.81505357959407]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86007156601336,41.814963191529166]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0094__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p94 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5752.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0094__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0094","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1438.0,2126.0 1438.0,1371.5 1438.0,0.0 225.1,0.0 226.0,228.5 0.0,231.2 -0.0,1242.0 259.4,1267.4 256.8,2126.0 1438.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0094__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[420.0,1283.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8562763,41.8171892]}},{"type":"Feature","properties":{"resourceCoords":[926.0,661.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8550844,41.8183678]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p95","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0095","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1438.0,2025.6 40.1,2015.0 44.1,1705.0 -0.0,1495.9 -0.0,-0.0 1438.0,0.0 1438.0,2025.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0095/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87637242612497,41.823473806071036]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87271545326797,41.823586571043585]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87249330802533,41.819528985480204]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87615028088233,41.819416220507655]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p96","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0096","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"9.6,0.0 1438.0,0.0 1438.0,2025.0 980.8,2023.5 983.2,2075.2 -0.0,2067.8 9.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0096/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8727336914802,41.823491074093816]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86923816034755,41.823606369729795]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.86901103048906,41.81972789861188]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.87250656162172,41.8196126029759]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p97","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0097","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,-0.0 1434.2,0.0 1397.0,240.9 1398.5,2085.9 388.1,2085.3 387.8,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1397.0,1097.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.877264,41.8185588]}},{"type":"Feature","properties":{"resourceCoords":[898.0,2086.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8784188,41.8167085]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p98","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0098","type":"ImageService3","width":1438,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"191.2,2111.3 207.3,246.2 247.2,3.0 690.7,0.0 715.5,544.1 1228.0,551.0 1207.3,2111.7 191.2,2111.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[709.0,1190.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8760104,41.8184543]}},{"type":"Feature","properties":{"resourceCoords":[1228.0,551.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.874807,41.8196573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1909 | sanborn01790_072 p99","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-23T20:56:08Z","modified":"2026-09-23T20:56:08Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0099","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1437.0,2015.0 1018.6,2126.0 37.4,2126.0 35.5,38.0 1425.5,27.1 1437.0,2015.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901909C:01790_C_1909-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[36.0,1569.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8746998,41.8168141]}},{"type":"Feature","properties":{"resourceCoords":[35.0,38.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.874807,41.8196573]}}]}}]}