{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01720_005.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Aurora, Illinois | 1950 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"166"},{"label":"placed","value":"105"},{"label":"unplaced","value":"61"},{"label":"fit sources","value":"georef 63, georef-snap 38, snap:0 3, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"25 sheet(s) cut into 87 panels"},{"label":"unplaced pages","value":"p0 (tier 1, 41.75883,-88.28094 +/-248m); p14__2 (tier 1, 41.76020,-88.32517 +/-160m); p26__2 (tier 4, 41.75684,-88.31258 +/-5710m); p28__1 (tier 1, 41.82354,-88.33771 +/-207m); p28__3 (tier 2, 41.73601,-88.33281 +/-2031m); p29__1 (tier 4, 41.75684,-88.31258 +/-5710m); p29__2 (tier 4, 41.75684,-88.31258 +/-5710m); p30__1 (tier 1, 41.77353,-88.32872 +/-149m); p30__2 (tier 1, 41.77413,-88.31535 +/-131m); p33 (tier 1, 41.77182,-88.29506 +/-241m); p37__1 (tier 1, 41.76454,-88.29922 +/-121m); p3__2 (tier 2, 41.76796,-88.32261 +/-552m); p45 (tier 1, 41.75037,-88.30446 +/-250m); p46__2 (tier 2, 41.75683,-88.31053 +/-124m); p46__3 (tier 1, 41.74718,-88.30996 +/-100m); p65__1 (tier 2, 41.75084,-88.31919 +/-248m); p65__2 (tier 1, 41.75798,-88.32233 +/-100m); p79__2 (tier 1, 41.74469,-88.31544 +/-118m); p79__3 (tier 1, 41.74652,-88.31400 +/-100m); p79__4 (tier 1, 41.74803,-88.31202 +/-100m); p79__5 (tier 1, 41.74476,-88.31853 +/-100m); p80__2 (tier 2, 41.76373,-88.29661 +/-2709m); p80__3 (tier 1, 41.76020,-88.27801 +/-130m); p81__1 (tier 2, 41.74143,-88.31816 +/-635m); p82__1 (tier 2, 41.77043,-88.31317 +/-100m); p82__2 (tier 2, 41.77043,-88.31317 +/-100m); p82__3 (tier 2, 41.77043,-88.31317 +/-100m); p83__2 (tier 4, 41.75684,-88.31258 +/-5710m); p83__3 (tier 4, 41.75684,-88.31258 +/-5710m); p84__1 (tier 1, 41.76804,-88.30343 +/-195m); p84__2 (tier 1, 41.75631,-88.30300 +/-112m); p84__3 (tier 1, 41.76887,-88.29235 +/-104m); p84__4 (tier 1, 41.77087,-88.31419 +/-126m); p85__1 (tier 4, 41.75684,-88.31258 +/-5710m); p85__3 (tier 4, 41.75684,-88.31258 +/-5710m); p85__4 (tier 1, 41.74886,-88.32898 +/-126m); p85__5 (tier 4, 41.75684,-88.31258 +/-5710m); p86__1 (tier 2, 41.76773,-88.28141 +/-100m); p86__2 (tier 2, 41.76773,-88.28141 +/-100m); p86__3 (tier 2, 41.76773,-88.28141 +/-100m); p86__4 (tier 1, 41.77282,-88.28804 +/-100m); p87 (tier 1, 41.76738,-88.31515 +/-260m); p88__1 (tier 1, 41.82917,-88.33368 +/-146m); p88__2 (tier 4, 41.75684,-88.31258 +/-5710m); p88__3 (tier 4, 41.75684,-88.31258 +/-5710m); p88__4 (tier 4, 41.75684,-88.31258 +/-5710m); p90__1 (tier 1, 41.73214,-88.33816 +/-127m); p90__4 (tier 1, 41.77112,-88.31791 +/-100m); p90__5 (tier 1, 41.76510,-88.33529 +/-100m); p90__6 (tier 1, 41.72492,-88.34769 +/-100m); p91__1 (tier 1, 41.75917,-88.32031 +/-208m); p91__2 (tier 1, 41.75612,-88.33159 +/-151m); p91__5 (tier 1, 41.75167,-88.32090 +/-100m); p91__6 (tier 1, 41.75536,-88.32941 +/-100m); p91__7 (tier 1, 41.75870,-88.31693 +/-100m); p93__1 (tier 2, 41.77027,-88.32982 +/-100m); p93__2 (tier 1, 41.79736,-88.33406 +/-106m); p94__1 (tier 2, 41.75713,-88.32436 +/-100m); p94__2 (tier 2, 41.75713,-88.32436 +/-100m); p94__3 (tier 2, 41.75713,-88.32436 +/-100m); p95__1 (tier 2, 41.75748,-88.29188 +/-594m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p1","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"21"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0001","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"142.8,2008.0 -0.0,2008.0 -0.0,103.4 1592.7,121.2 1603.0,787.0 1266.2,784.2 1248.7,1486.1 1670.0,1496.5 1670.0,2008.0 736.3,2008.0 736.5,1787.5 143.1,1793.9 142.8,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[597.0,1028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3256356,41.77057]}},{"type":"Feature","properties":{"resourceCoords":[1603.0,787.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3244282,41.7670377]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0010","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1506.8,2008.0 193.1,2008.0 181.9,349.0 1506.1,296.0 1506.8,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32735803434846,41.76565102898034]}},{"type":"Feature","properties":{"resourceCoords":[1653.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32349413364516,41.76528205283195]}},{"type":"Feature","properties":{"resourceCoords":[1653.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32409083361138,41.76175631555972]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32795473431469,41.76212529170812]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p100","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"30"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0100","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1595.2 -0.0,128.8 284.6,126.8 283.9,0.0 1405.1,0.0 1673.0,0.0 1673.0,1872.8 1237.3,2008.0 778.4,2008.0 777.1,1866.9 270.3,2008.0 272.9,1595.9 -0.0,1595.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[797.0,431.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2839338,41.7618549]}},{"type":"Feature","properties":{"resourceCoords":[528.0,1941.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.285163,41.7564804]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0101","type":"ImageService3","width":1628,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.0,1730.0 215.4,1751.3 212.2,600.5 44.5,653.5 39.9,349.9 564.9,199.0 567.0,344.2 1043.0,341.7 1494.2,200.2 1493.1,0.0 1628.0,0.0 1628.0,2008.0 59.1,2008.0 55.0,1730.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28657345717224,41.75743345959937]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27909350042206,41.757446302388374]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27907241561022,41.75051512011029]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28655237236039,41.75050227732129]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p102","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"13"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0102","type":"ImageService3","width":1677,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"294.7,1565.9 270.3,1565.9 270.9,1258.7 304.9,1258.7 315.8,933.3 -0.0,922.8 -0.0,-0.0 1677.0,0.0 1677.0,339.5 1317.3,341.3 1319.3,727.1 1345.6,727.0 1347.2,1880.5 1540.6,1879.0 1540.7,1973.5 1540.7,1973.5 1540.7,2008.0 630.5,2008.0 630.5,1881.4 284.1,1881.1 294.7,1565.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[795.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2912896,41.7639945]}},{"type":"Feature","properties":{"resourceCoords":[131.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.294438,41.763977]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p103","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0103","type":"ImageService3","width":1625,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"481.5,744.4 481.3,659.4 512.4,659.5 511.3,353.7 335.9,354.4 336.4,10.8 1625.0,0.0 1625.0,426.0 1382.9,453.7 1406.3,657.4 1625.0,656.8 1625.0,1783.0 484.7,1781.7 485.2,1910.7 -0.0,1913.6 -0.0,746.1 481.5,744.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[482.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2864407,41.7662019]}},{"type":"Feature","properties":{"resourceCoords":[1507.0,1281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2816252,41.7651537]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0011","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1649.1,1939.5 -0.0,1804.3 -0.0,0.0 1411.0,0.0 1422.1,672.0 1629.3,656.6 1649.1,1939.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32775537350902,41.768250594280545]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32382885158161,41.768219902371705]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32387798268941,41.7646736483231]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32780450461682,41.76470434023194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p12","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"17"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0012","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1210.2,1967.4 34.9,1636.6 33.5,81.3 1563.9,84.2 1642.1,1967.8 1210.2,1967.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[594.0,1396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3210671,41.7627729]}},{"type":"Feature","properties":{"resourceCoords":[594.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3242259,41.7630623]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p13","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0013","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1294.0 -0.0,56.3 14.1,115.5 400.3,31.0 1670.0,237.6 1670.0,728.9 1603.5,1186.3 1383.5,1962.5 1345.1,1957.3 428.1,1816.7 504.4,1195.9 -0.0,1294.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[583.0,634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3187643,41.7624021]}},{"type":"Feature","properties":{"resourceCoords":[662.0,71.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.318073,41.76327]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p14 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"19"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6612.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.8,1920.3 0.0,1958.0 0.0,1993.2 1541.3,1960.2 1397.8,1604.3 1310.1,1603.6 1310.1,1535.6 537.2,30.9 77.9,242.7 226.2,615.3 228.8,1920.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[229.0,884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.318073,41.76327]}},{"type":"Feature","properties":{"resourceCoords":[1477.0,1965.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.314365,41.7641161]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p14 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"5102.8"},{"label":"split_canvas_y","value":"5079.2"},{"label":"split_canvas_w","value":"1509.2"},{"label":"split_canvas_h","value":"1346.8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1653.0,1585.5 1653.0,1269.8 1310.1,1270.3 1275.7,1270.3 1310.1,1342.4 1310.1,1603.6 1325.6,1603.7 1653.0,1585.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0014__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1275.7,1269.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33006895679038,41.767417199588984]}},{"type":"Feature","properties":{"resourceCoords":[1653.0,1269.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32918143904732,41.76754071139576]}},{"type":"Feature","properties":{"resourceCoords":[1653.0,1606.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32903296272404,41.76695040414834]}},{"type":"Feature","properties":{"resourceCoords":[1275.7,1606.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32992048046711,41.76682689234156]}},{"type":"Feature","properties":{"resourceCoords":[1625.0,1580.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3291113,41.7669865]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p15 [1]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"23"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6680.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"151.0,1150.4 149.9,2008.0 1670.0,2008.0 1670.0,242.3 868.5,240.9 865.5,1156.3 151.0,1150.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[775.0,1473.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3316818,41.7580029]}},{"type":"Feature","properties":{"resourceCoords":[1090.0,471.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3296536,41.761431]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p15 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2997.2"},{"label":"split_canvas_h","value":"4453.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"619.2,135.1 620.3,0.0 56.4,0.0 51.9,891.6 -0.0,891.0 0.0,1112.7 598.2,1113.4 749.3,556.4 743.1,135.8 619.2,135.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0015__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[54.0,720.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3380675,41.7576128]}},{"type":"Feature","properties":{"resourceCoords":[619.2,135.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3350905,41.7594474]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p16","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"24"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0016","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"847.0,162.8 1478.2,166.0 1236.5,1012.0 1355.2,1045.9 962.5,1540.5 1032.8,1596.5 638.1,2008.0 354.8,2008.0 346.1,234.4 845.5,240.2 847.0,162.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1004.0,837.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3240139,41.7596333]}},{"type":"Feature","properties":{"resourceCoords":[1515.0,471.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3214133,41.7607073]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0017","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 -0.0,202.8 118.6,185.1 1592.8,210.1 1589.2,383.0 1670.0,393.9 1670.0,2008.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34727848832998,41.758448820314754]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33948001342391,41.758512661854404]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33937783523713,41.75146817578982]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3471763101432,41.75140433425017]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0018","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"378.3,1691.3 247.1,2008.0 -0.0,2008.0 -0.0,248.2 689.8,56.6 822.9,63.2 744.5,688.6 1656.0,830.6 1196.9,2008.0 1092.8,2008.0 626.0,1827.6 378.3,1691.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[744.0,689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3201938,41.7605696]}},{"type":"Feature","properties":{"resourceCoords":[444.0,1519.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3216043,41.7594206]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p19","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0019","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1068.3,455.8 1074.5,1888.3 430.0,1871.0 524.2,1834.5 526.8,1642.2 529.0,579.4 1068.3,455.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1216.0,1146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.318085,41.7581491]}},{"type":"Feature","properties":{"resourceCoords":[1216.0,422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3168908,41.7590789]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p2","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"24"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0002","type":"ImageService3","width":1639,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1639.0,0.0 1639.0,476.2 1383.9,445.6 1196.3,1871.3 1078.9,1889.4 1079.3,2008.0 -0.0,2008.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[908.0,1093.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.348099,41.760536]}},{"type":"Feature","properties":{"resourceCoords":[583.0,1925.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.349605,41.7576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0020","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,561.6 147.9,527.2 152.3,-0.0 1662.0,-0.0 1662.0,1696.9 1367.6,1742.7 1210.8,1695.2 1092.7,1721.5 959.7,1828.2 724.6,1921.2 737.6,2008.0 -0.0,2008.0 -0.0,561.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31628443413283,41.75993641991426]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31344967580463,41.757899307157665]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31672589820084,41.75532640594608]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31956065652903,41.757363518702675]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p21","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0021","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"661.5,1917.5 -0.0,1912.8 114.8,1104.5 120.2,0.0 1668.0,0.0 1668.0,1613.4 784.9,1401.8 661.5,1917.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,1106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3156003,41.7601661]}},{"type":"Feature","properties":{"resourceCoords":[820.0,147.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3144555,41.7616177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0022","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1630.0,290.9 1645.0,2008.0 -0.0,2008.0 -0.0,1642.8 209.0,1638.5 209.1,858.6 209.0,821.0 -0.0,804.6 0.0,-0.0 1662.0,0.0 1630.0,290.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[209.0,1284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3221846,41.7558866]}},{"type":"Feature","properties":{"resourceCoords":[209.0,1638.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3216129,41.7554586]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0023","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"104.8,817.5 154.4,668.3 -0.0,668.8 -0.0,58.6 780.1,57.8 804.0,0.0 1668.0,0.0 1668.0,1572.8 1574.0,1572.0 1636.9,2008.0 505.2,1991.1 439.3,1578.2 275.4,1600.5 104.8,817.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32943869047757,41.753322422867136]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32676517606048,41.75548592588298]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32329842477274,41.75306794605115]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32597193918984,41.7509044430353]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0024","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.8,145.3 1421.8,745.1 1624.6,762.0 1625.8,1555.1 1423.1,1558.2 1423.6,1912.5 1662.0,1913.8 1662.0,2008.0 127.9,2007.0 48.7,1572.0 143.0,1569.3 85.0,0.0 1423.8,145.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32689162726922,41.75536991371203]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32413395158713,41.75744223993187]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3208012230792,41.754939205908684]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32355889876129,41.752866879688845]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p25","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0025","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 -0.0,-0.0 1448.0,0.0 1360.5,547.5 1522.0,571.6 1445.2,719.4 1491.0,890.2 1492.9,1563.8 1668.0,1566.6 1668.0,2008.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3310004,41.7511457]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3289148,41.7534532]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32519130000001,41.7515801]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3272769,41.7492726]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0026__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p26 [1]","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":"6648.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0026__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0026","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1662.0,0.0 601.9,0.0 -0.0,-0.0 -0.0,2008.0 335.2,2008.0 334.5,1785.3 532.9,1784.4 536.2,2008.0 1285.0,2008.0 1453.0,2008.0 1662.0,2008.0 1662.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0026__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1521.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.331117,41.744244]}},{"type":"Feature","properties":{"resourceCoords":[211.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3337896,41.7454177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p27 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4942.0"},{"label":"split_canvas_w","value":"3735.6"},{"label":"split_canvas_h","value":"3090.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1542.1 -0.0,2008.0 930.3,2008.0 933.9,1751.9 695.0,1235.5 519.3,1235.6 518.9,1283.0 386.7,1278.7 224.1,1274.1 236.0,1309.4 171.5,1332.9 252.4,1545.3 -0.0,1542.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[331.0,1748.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3394392,41.7295931]}},{"type":"Feature","properties":{"resourceCoords":[252.0,1545.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.340196,41.72991]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p27 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"22"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6672.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 0.0,294.0 0.0,1267.8 386.7,1278.7 518.9,1283.0 519.3,1235.6 695.0,1235.5 933.9,1751.9 930.3,2008.0 931.9,2008.0 1171.5,1295.5 1568.5,1434.7 1553.6,1055.9 1668.0,1053.1 1668.0,0.0 1373.7,0.0 1381.0,44.5 547.5,75.0 507.0,0.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0027__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[509.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3442962,41.7295823]}},{"type":"Feature","properties":{"resourceCoords":[545.0,1084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.342201,41.728688]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0028__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p28 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4449.6"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"3582.4"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0028__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0028","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1662.0,1310.0 1662.0,1126.8 1121.1,1112.4 402.3,1310.8 445.3,1486.2 729.4,1464.0 772.0,2008.0 1279.1,2008.0 1526.5,2008.0 1662.0,2008.0 1662.0,1310.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0028__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[588.0,1534.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.343054,41.7311255]}},{"type":"Feature","properties":{"resourceCoords":[1131.0,1950.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.341432,41.731477]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p30 [3]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"2706.0"},{"label":"split_canvas_y","value":"3510.8"},{"label":"split_canvas_w","value":"3958.0"},{"label":"split_canvas_h","value":"4521.2"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"901.0,2008.0 1666.0,2008.0 1666.0,877.7 676.5,884.6 688.4,1371.5 698.9,1843.0 886.8,1838.6 901.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[803.4,1293.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3141973,41.7727659]}},{"type":"Feature","properties":{"resourceCoords":[1146.3,1850.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3123289,41.7708068]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p30 [4]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5486.0"},{"label":"split_canvas_w","value":"2810.4"},{"label":"split_canvas_h","value":"2546.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 702.6,2008.0 688.7,1386.6 17.8,1371.9 0.0,1371.9 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0030__4/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1371.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31525922439667,41.77065867886618]}},{"type":"Feature","properties":{"resourceCoords":[702.6,1371.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31359311102544,41.77081452274377]}},{"type":"Feature","properties":{"resourceCoords":[702.6,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.313403266673,41.76969156134523]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31506938004424,41.76953571746764]}},{"type":"Feature","properties":{"resourceCoords":[661.6,1413.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3136788,41.7707304]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p31","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0031","type":"ImageService3","width":1674,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"148.0,0.0 1674.0,0.0 1674.0,2008.0 297.2,2008.0 286.7,1651.2 93.5,1657.0 148.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[980.0,1796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3005198,41.7676515]}},{"type":"Feature","properties":{"resourceCoords":[980.0,67.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3046202,41.767923]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p32","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0032","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.2,0.0 1666.0,0.0 1666.0,535.9 1505.2,556.0 1620.2,1317.2 1666.0,1311.8 1666.0,2008.0 134.2,1992.0 62.2,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1593.0,1117.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3014879,41.7715775]}},{"type":"Feature","properties":{"resourceCoords":[342.0,1278.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3014772,41.769363]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p34","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0034","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"88.4,457.4 0.0,395.8 0.0,-0.0 1666.0,0.0 1666.0,1755.0 645.0,1819.5 644.1,1855.4 46.7,1857.3 88.4,457.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[656.0,1362.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3022928,41.7643583]}},{"type":"Feature","properties":{"resourceCoords":[58.0,1362.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3024704,41.7632728]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0035","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1146.5,1965.8 -0.0,1866.0 37.1,1251.3 -0.0,1248.1 -0.0,-0.0 1670.0,0.0 1670.0,1931.2 1146.5,1965.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30100928059504,41.766447211458846]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29707201118224,41.766273239518185]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29735049452196,41.7627171752846]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30128776393477,41.76289114722526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p36","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0036","type":"ImageService3","width":1674,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"129.3,1957.5 192.5,7.8 1674.0,0.0 1674.0,655.7 1605.5,658.0 1624.9,1276.3 1674.0,1274.7 1674.0,1909.9 129.3,1957.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1606.0,658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2937855,41.7650674]}},{"type":"Feature","properties":{"resourceCoords":[1364.0,1920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2944299,41.7628629]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0037__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p37 [2]","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":"6680.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0037__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0037","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1564.0,1276.0 1552.1,61.0 623.6,43.4 561.6,135.0 155.6,140.9 153.5,0.0 -0.0,-0.0 0.0,1341.3 76.3,1341.0 110.4,1258.0 1052.0,1271.0 1486.9,1452.4 1487.8,1275.0 1564.0,1276.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0037__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[307.0,656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3056111,41.7625231]}},{"type":"Feature","properties":{"resourceCoords":[1564.0,1276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.302836,41.7611245]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0038","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"89.8,1907.9 81.8,1505.8 -0.0,1472.5 -0.0,1293.9 77.3,1294.4 59.1,71.3 1294.8,74.6 1576.4,1918.5 89.8,1907.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30258448229431,41.76341257199713]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29870659993516,41.76299609449598]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29937644710228,41.75947663616189]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30325432946142,41.75989311366304]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p39","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0039","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1529.8,1958.3 460.5,1956.5 -0.0,1889.1 -0.0,16.3 426.3,83.2 1533.2,86.8 1529.8,1958.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1212.0,708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2967069,41.761758]}},{"type":"Feature","properties":{"resourceCoords":[1212.0,85.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2967209,41.7628566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0003__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p3 [1]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"22"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6680.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0003__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0003","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.0,1955.9 1270.0,1943.0 1272.0,2008.0 1294.3,2008.0 1302.2,1963.5 1670.0,2008.0 1670.0,1621.0 1315.4,1614.4 1316.4,1226.7 1380.0,1226.6 1344.1,946.4 1474.6,929.8 1411.0,0.0 -0.0,-0.0 -0.0,365.1 63.7,364.1 72.0,1955.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0003__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[717.0,943.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3182242,41.770675]}},{"type":"Feature","properties":{"resourceCoords":[1270.0,1943.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3156186,41.7671453]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p4","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"29"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0004","type":"ImageService3","width":1645,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 1455.6,0.0 1457.4,207.4 1458.5,260.0 1645.0,235.5 1645.0,1836.4 0.0,1848.6 0.0,1487.6 173.6,1467.8 0.0,330.1 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[763.0,829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3424438,41.7600794]}},{"type":"Feature","properties":{"resourceCoords":[457.0,1846.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3379181,41.758588]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0040","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1021.8,1955.6 -0.0,1953.3 -0.0,82.5 1662.0,86.3 1662.0,2008.0 1021.8,2008.0 1021.8,1955.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29596289126907,41.763004141149864]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29206019564096,41.763026921308494]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2920235569779,41.75948493248909]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29592625260601,41.75946215233046]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0041","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1500.2,1646.0 1670.0,1581.8 1670.0,2008.0 1607.9,2008.0 135.2,1897.1 125.3,2008.0 -0.0,2008.0 -0.0,353.7 887.7,0.0 1453.5,0.0 1670.0,504.8 1670.0,1011.7 1293.6,1162.6 1500.2,1646.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30585235708271,41.762048213369454]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30245539217572,41.76055987761373]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30483764757885,41.757491575426144]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30823461248585,41.75897991118187]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0042","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1102.7,1494.2 11.3,1367.5 13.9,860.1 414.6,871.3 613.9,412.1 614.9,266.9 1631.8,297.9 1637.8,1491.2 1102.7,1494.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30439103611181,41.760650529299525]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30045870876361,41.760298715763675]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30102452878701,41.756729693360285]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3049568561352,41.757081506896135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0043","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.4,1688.6 77.3,363.1 924.8,402.2 1517.1,341.5 1536.0,1736.2 61.4,1688.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30070600870926,41.76042096894637]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29684121503776,41.76011987113733]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29732314800476,41.75662893625554]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30118794167626,41.75693003406458]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0044","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,354.7 1581.6,203.9 1586.7,255.8 1662.0,248.4 1662.0,1799.7 -0.0,1729.9 -0.0,354.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29720201300216,41.76018003162045]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29329576743359,41.75991586882916]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2937206162178,41.75637049377002]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29762686178637,41.75663465656131]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0046__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p46 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6680.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0046__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0046","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"427.5,1927.8 427.5,1533.2 427.5,1295.5 639.7,1293.1 644.7,1293.0 636.4,1526.8 635.5,1592.7 634.1,1592.3 623.6,1930.1 1445.1,1939.7 1461.2,-0.0 -0.0,0.0 -0.0,1922.8 427.5,1927.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0046__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[361.0,521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3109479,41.7591396]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,1244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3097806,41.7569647]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p47","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0047","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"86.4,1677.3 79.7,54.5 1558.8,47.5 1574.3,1686.0 86.4,1677.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1566.0,763.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3059236,41.7564918]}},{"type":"Feature","properties":{"resourceCoords":[82.0,1485.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3097806,41.7569647]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0048","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"91.2,-0.0 1576.9,-0.0 1580.4,1918.5 86.8,1943.1 91.2,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0048/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31021002776848,41.75677639880261]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3069902332761,41.75505679332809]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30974243639831,41.75214828063346]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31296223089069,41.75386788610798]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p49","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0049","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1654.6,1877.0 920.8,1902.4 923.2,1974.5 424.5,1919.0 -0.0,1819.2 -0.0,1599.2 460.6,392.8 520.1,410.9 642.4,0.0 1662.0,0.0 1662.0,683.3 1520.7,689.0 1654.6,1877.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[425.0,1919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3058853,41.7549571]}},{"type":"Feature","properties":{"resourceCoords":[1521.0,689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3027008,41.7566069]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p5","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0005","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1030.1,908.9 1670.0,1148.1 1670.0,1731.2 341.2,2008.0 -0.0,2008.0 -0.0,0.0 1381.8,-0.0 1030.1,908.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[633.0,1947.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3155757,41.7660637]}},{"type":"Feature","properties":{"resourceCoords":[1738.0,1174.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.314365,41.7641161]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0050","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.8,677.6 236.1,10.7 684.9,0.0 684.9,101.2 1653.1,124.0 1670.0,1981.3 -0.0,1841.7 13.2,666.2 152.8,677.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30255334853956,41.75779130167966]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29861028841502,41.757454823308514]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29914882803708,41.75389304105485]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30309188816162,41.754229519426]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p51","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0051","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.2,1895.5 135.6,85.8 1449.6,56.6 1529.0,1949.5 224.2,1895.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[168.0,747.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2988591,41.7560355]}},{"type":"Feature","properties":{"resourceCoords":[1529.0,1950.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2960234,41.7534767]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0052","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"742.1,1985.7 95.6,1959.3 97.0,21.1 866.8,32.5 866.0,0.0 962.2,0.0 966.4,34.8 1670.0,50.1 1670.0,1602.7 742.1,1985.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29571524898121,41.75697343890706]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29177025369864,41.756631568169986]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29231741753,41.753067996404916]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29626241281257,41.75340986714199]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p53","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0053","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"698.6,74.9 801.7,-0.0 800.7,318.1 1137.8,328.3 1105.0,1719.0 433.9,1710.1 698.6,74.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[756.0,1719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3155848,41.7553829]}},{"type":"Feature","properties":{"resourceCoords":[1105.0,1719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3148852,41.7550267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p54","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0054","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1447.2,276.9 1444.0,1701.0 324.0,1701.0 331.2,286.2 1447.2,276.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1444.0,1701.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.312706,41.7538725]}},{"type":"Feature","properties":{"resourceCoords":[324.0,1701.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3148852,41.7550267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p55","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0055","type":"ImageService3","width":1655,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"763.9,1500.0 -0.0,1339.6 256.4,0.0 769.8,27.8 1267.7,0.0 1533.0,1279.4 1480.2,1298.0 1633.0,1785.2 999.5,2008.0 903.8,1995.4 763.9,1500.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[916.0,2037.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3074303,41.7515892]}},{"type":"Feature","properties":{"resourceCoords":[269.0,-62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3068932,41.7554487]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p56","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0056","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1430.6 56.5,1428.6 194.7,55.1 1632.4,200.3 1618.8,1888.8 -0.0,1942.0 -0.0,1430.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0056/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30518268654076,41.75491269451571]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30126595650073,41.754620479014854]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30173195795098,41.75109499289808]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30564868799101,41.75138720839894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0057","type":"ImageService3","width":1672,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"17.1,54.5 1672.0,201.3 1657.6,1662.7 1590.0,1665.6 1592.4,2008.0 36.6,2008.0 17.1,54.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30144091783686,41.75437580328873]}},{"type":"Feature","properties":{"resourceCoords":[1672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29751145285138,41.7540624420461]}},{"type":"Feature","properties":{"resourceCoords":[1672.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29801236750066,41.75051700448109]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30194183248614,41.75083036572372]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0058","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 -0.0,1507.0 67.3,1504.6 91.7,49.6 1472.1,137.2 1676.0,1962.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29776670687828,41.75381101679464]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29380827132906,41.753516135005476]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29427851656229,41.749953047259574]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29823695211151,41.75024792904874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p59","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0059","type":"ImageService3","width":1672,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1597.2,1368.5 1516.2,2008.0 -0.0,2008.0 -0.0,137.8 207.1,99.9 353.6,-0.0 520.3,-0.0 649.6,62.5 1617.1,63.8 1597.2,1368.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1266.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3155848,41.7553829]}},{"type":"Feature","properties":{"resourceCoords":[1266.0,672.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3164207,41.7544928]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p6","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0006","type":"ImageService3","width":1645,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"187.9,0.0 1645.0,0.0 1645.0,1743.4 199.2,1764.0 187.9,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1329.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3151613,41.7631228]}},{"type":"Feature","properties":{"resourceCoords":[200.0,1897.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3158631,41.7622606]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0060","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"195.4,1743.1 246.4,78.7 1369.5,71.3 1385.5,1537.3 195.4,1743.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0060/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31525241032611,41.755396424880296]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31201555833128,41.75365815700371]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31478760888875,41.750744638452545]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31802446088358,41.75248290632913]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p61","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"19"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0061","type":"ImageService3","width":1672,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1590.5,-0.0 1672.0,-0.0 1672.0,1080.6 1672.0,1083.1 1099.9,1403.0 804.8,1478.7 813.8,1522.5 61.9,1686.4 80.2,194.8 1587.5,196.6 1590.5,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1100.0,1403.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3123452,41.751115]}},{"type":"Feature","properties":{"resourceCoords":[728.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3114597,41.7532205]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0062","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.1,1464.1 725.5,518.3 653.6,480.9 912.8,0.0 919.6,47.9 1610.5,412.9 1608.2,1893.0 221.2,1955.5 224.1,1464.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0062/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31092056025888,41.75363597385042]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30699307261678,41.75328092662417]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30755926139683,41.749745685172236]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31148674903893,41.75010073239849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0063","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1626.9,1828.0 915.2,1860.5 3.5,1871.7 27.0,163.9 1498.0,103.5 1633.8,1164.6 1626.9,1828.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0063/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30745305279042,41.75188084187161]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3035713330378,41.75157420246089]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30406265882702,41.74806330688008]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30794437857965,41.7483699462908]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0064","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"498.3,2008.0 540.1,1034.1 144.6,1036.8 158.7,706.0 108.0,174.5 568.6,172.4 574.9,311.6 1341.9,337.2 1472.4,1744.8 1676.0,1725.9 1676.0,2008.0 498.3,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30443822991892,41.752065083793205]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2966011607171,41.75163751746126]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29728295861344,41.74458277907734]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30512002781525,41.745010345409284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0065__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p65 [3]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6672.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0065__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0065","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.5,284.1 0.0,748.2 -0.0,2008.0 886.5,2000.3 1435.5,1825.5 1469.5,2008.0 1668.0,1979.2 1668.0,319.5 1311.3,299.6 1324.5,-0.0 768.8,-0.0 714.2,305.0 223.5,284.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0065__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[546.0,1241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3192912,41.7510417]}},{"type":"Feature","properties":{"resourceCoords":[193.0,1241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3199918,41.7513754]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0066","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.4,18.2 1643.7,0.0 1651.1,1549.8 199.2,2008.0 501.9,393.2 156.9,310.9 225.4,18.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31665264856909,41.752326225459946]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31298750868635,41.75120567685208]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31477438755616,41.74790650050545]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3184395274389,41.749027049113316]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p67","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0067","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1447.8,119.5 1437.8,1533.7 90.4,1587.1 510.8,59.3 801.7,130.8 1447.8,119.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1441.0,1888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.311294,41.747876]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,606.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3109535,41.7501464]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p68","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0068","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1512.3,488.4 1519.6,1797.0 149.4,1852.1 130.4,558.7 1512.3,488.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1514.0,594.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3077133,41.7497771]}},{"type":"Feature","properties":{"resourceCoords":[141.0,1495.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3112075,41.7485035]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0069","type":"ImageService3","width":1668,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"652.8,1938.6 649.5,2008.0 -0.0,2008.0 -0.0,0.0 291.1,-0.0 290.3,288.8 1610.8,283.6 1598.6,1951.2 652.8,1938.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32155032672398,41.751123601777984]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31827873396752,41.749551703915024]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32079732954148,41.74659259840954]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32406892229794,41.7481644962725]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0007","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1489.7,1844.5 33.2,1855.3 48.1,134.2 177.2,132.4 178.0,87.9 390.1,129.6 1606.2,114.0 1628.3,-0.0 1670.0,-0.0 1489.7,1844.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31530313389655,41.767234636303016]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31523894191781,41.76426847145112]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31998707685237,41.764210495555055]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32005126883111,41.76717666040695]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0070","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"555.8,1886.0 -0.0,1723.1 -0.0,1584.5 427.7,139.4 -0.0,0.0 596.5,0.0 578.5,182.2 775.5,208.6 1619.3,35.3 1411.4,728.4 1623.2,1688.6 602.7,1732.0 555.8,1886.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31962371015983,41.7496415128003]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31581977162176,41.748794580555256]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31717027404186,41.745370324907114]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32097421257993,41.74621725715216]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p71","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0071","type":"ImageService3","width":1666,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1666.0,1958.5 1666.0,2008.0 1322.9,2008.0 1326.1,1940.7 938.5,1920.4 933.8,2008.0 -0.0,2008.0 -0.0,667.4 353.1,33.9 1535.8,36.5 1516.9,1950.7 1666.0,1958.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31679834511093,41.74886744844223]}},{"type":"Feature","properties":{"resourceCoords":[1666.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31287342696994,41.74865771633492]}},{"type":"Feature","properties":{"resourceCoords":[1666.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31320986672432,41.745103321742455]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3171347848653,41.74531305384977]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p72","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0072","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,41.6 835.5,33.5 827.6,387.1 1447.3,389.9 1426.5,926.5 1469.4,927.9 1454.3,1594.2 1676.0,1602.5 1676.0,2008.0 1438.8,2008.0 1438.6,2008.0 -0.0,2008.0 -0.0,1946.0 -0.0,1946.0 -0.0,41.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0072/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31317832432944,41.748683548985454]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30921220071036,41.74844200792766]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30959735352957,41.744871717729325]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31356347714865,41.74511325878712]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p73","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0073","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"740.6,2008.0 740.9,1844.2 54.0,1844.0 43.3,1167.0 -0.0,1167.2 -0.0,621.8 753.9,597.1 756.2,57.9 1662.0,21.4 1662.0,2008.0 740.6,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[54.0,1844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3100427,41.7456394]}},{"type":"Feature","properties":{"resourceCoords":[1255.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3067363,41.7485053]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0074","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1676.0,2008.0 287.4,2008.0 291.4,1647.2 181.1,1662.4 187.6,132.0 1676.0,53.3 1676.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30618274035488,41.74873071436437]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30224920659722,41.748388204437816]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30279536084167,41.74484725178649]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30672889459933,41.74518976171304]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0075","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 -0.0,114.1 68.6,113.3 71.1,44.5 1632.6,42.4 1626.8,1594.1 1662.0,1695.3 1662.0,2008.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0075/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32278388876851,41.7477861054958]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31951849977067,41.7461784636905]}},{"type":"Feature","properties":{"resourceCoords":[1662.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3221035306749,41.74321415208158]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32536891967274,41.74482179388688]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0076","type":"ImageService3","width":1676,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1676.0,2008.0 -0.0,2008.0 -0.0,1581.0 560.2,0.0 1574.2,0.0 1635.3,346.4 1676.0,339.2 1676.0,753.5 1547.8,767.0 1676.0,1795.2 1676.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32071633972582,41.74662744591147]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3168397904231,41.745897358701825]}},{"type":"Feature","properties":{"resourceCoords":[1676.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31800391973775,41.742407577373534]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32188046904047,41.74313766458318]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p77","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0077","type":"ImageService3","width":1662,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"183.1,654.0 235.3,233.6 1131.7,189.9 1132.0,101.0 1662.0,103.2 1662.0,1814.4 1136.8,1811.6 1136.3,2008.0 51.5,2008.0 24.8,1927.4 51.6,1711.4 52.1,651.2 183.1,654.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[50.0,1637.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3178634,41.7429071]}},{"type":"Feature","properties":{"resourceCoords":[1132.0,101.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.314909,41.74535]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p78","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0078","type":"ImageService3","width":1682,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"137.9,183.2 1630.8,134.7 1627.2,2008.0 949.5,2008.0 948.1,1820.4 132.7,1815.9 137.9,183.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[952.0,1185.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.31205,41.7432]}},{"type":"Feature","properties":{"resourceCoords":[952.0,665.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.311906,41.744114]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p79 [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":"2922.4"},{"label":"split_canvas_h","value":"2576.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"707.5,0.0 -0.0,-0.0 -0.0,493.6 37.0,498.1 37.8,628.4 323.3,635.0 707.3,623.0 730.6,0.0 707.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.7,625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3014879,41.7715775]}},{"type":"Feature","properties":{"resourceCoords":[548.7,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3014788,41.772671]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__6/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p79 [6]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3904.4"},{"label":"split_canvas_w","value":"6624.0"},{"label":"split_canvas_h","value":"4127.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__6/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1656.0,1297.2 1038.8,1274.0 1013.4,1137.0 676.3,1133.6 685.4,986.1 680.5,986.0 0.0,976.1 -0.0,2008.0 1656.0,2008.0 1656.0,1297.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0079__6/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[405.0,1810.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.286406,41.7640298]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,1190.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2839778,41.7651288]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p8","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0008","type":"ImageService3","width":1653,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1562.0,99.7 1377.9,1940.0 81.0,1921.5 81.0,106.0 1562.0,99.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[81.0,1922.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3239407,41.767061]}},{"type":"Feature","properties":{"resourceCoords":[81.0,106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.319689,41.767122]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0080__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p80 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3070.8"},{"label":"split_canvas_h","value":"4231.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0080__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0080","type":"ImageService3","width":1689,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"601.2,-0.0 0.0,-0.0 -0.0,1057.9 767.7,1051.4 763.0,61.2 600.8,61.0 601.2,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0080__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":[-88.28632905298099,41.76836321319425]}},{"type":"Feature","properties":{"resourceCoords":[767.7,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28630611463042,41.766998757069445]}},{"type":"Feature","properties":{"resourceCoords":[767.7,1057.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28883312981833,41.76697525193151]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1057.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2888560681689,41.76833970805632]}},{"type":"Feature","properties":{"resourceCoords":[600.8,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2864568,41.7672941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p81 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4942.0"},{"label":"split_canvas_w","value":"2725.6"},{"label":"split_canvas_h","value":"3090.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2008.0 681.4,2008.0 680.9,1240.1 234.3,1237.1 235.4,1280.7 0.0,1281.3 0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1235.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29248975575135,41.74365802034648]}},{"type":"Feature","properties":{"resourceCoords":[681.4,1235.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29246757705072,41.74244814939435]}},{"type":"Feature","properties":{"resourceCoords":[681.4,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29431384725594,41.742429423410194]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29433602595657,41.743639294362325]}},{"type":"Feature","properties":{"resourceCoords":[345.2,1280.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.292586,41.743044]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p81 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"2723.6"},{"label":"split_canvas_y","value":"4960.4"},{"label":"split_canvas_w","value":"1960.0"},{"label":"split_canvas_h","value":"3071.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"935.8,2008.0 937.6,1935.4 1170.8,1940.7 1170.7,1675.7 941.3,1242.0 680.9,1240.1 681.4,2008.0 935.8,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0081__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[680.9,1240.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29096949116493,41.744164885574534]}},{"type":"Feature","properties":{"resourceCoords":[1170.9,1240.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29092402807062,41.74328760440225]}},{"type":"Feature","properties":{"resourceCoords":[1170.9,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2927502131613,41.743234171044854]}},{"type":"Feature","properties":{"resourceCoords":[680.9,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29279567625561,41.74411145221714]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0083__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p83 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6616.0"},{"label":"split_canvas_h","value":"8032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0083__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0083","type":"ImageService3","width":1654,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 1654.0,2008.0 1654.0,544.4 1139.7,536.8 1140.3,944.0 706.3,946.6 707.4,533.4 707.4,529.9 833.3,531.9 832.9,0.0 -0.0,-0.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0083__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1521.0,1374.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3220997,41.8068308]}},{"type":"Feature","properties":{"resourceCoords":[295.0,1476.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3254396,41.8062865]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p85 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"1918.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4706.0"},{"label":"split_canvas_h","value":"5032.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1656.0,6.4 1390.6,9.6 1390.5,8.0 487.6,20.2 479.5,438.9 810.1,439.9 810.5,523.1 813.2,1172.0 976.1,1169.6 976.2,1258.0 1363.4,1257.4 1656.0,1257.0 1656.0,6.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[479.5,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32923656621203,41.772130868128755]}},{"type":"Feature","properties":{"resourceCoords":[1656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32919923614784,41.77003978891724]}},{"type":"Feature","properties":{"resourceCoords":[1656.0,1258.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33220391798736,41.770010110612795]}},{"type":"Feature","properties":{"resourceCoords":[479.5,1258.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33224124805155,41.77210118982431]}},{"type":"Feature","properties":{"resourceCoords":[1399.1,1186.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3320401,41.7704684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__6/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p85 [6]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"5453.6"},{"label":"split_canvas_y","value":"5028.0"},{"label":"split_canvas_w","value":"1170.4"},{"label":"split_canvas_h","value":"3004.0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__6/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085","type":"ImageService3","width":1656,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1656.0,1257.0 1363.4,1257.4 1364.4,2008.0 1656.0,2008.0 1656.0,1257.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0085__6/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1363.4,1257.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32069353290551,41.7360325344722]}},{"type":"Feature","properties":{"resourceCoords":[1656.0,1257.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31999367225097,41.73603643322351]}},{"type":"Feature","properties":{"resourceCoords":[1656.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31998023774567,41.73470211300768]}},{"type":"Feature","properties":{"resourceCoords":[1363.4,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3206800984002,41.73469821425637]}},{"type":"Feature","properties":{"resourceCoords":[1568.1,1641.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.320197,41.735353]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p86 [5]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"4341.2"},{"label":"split_canvas_y","value":"3241.6"},{"label":"split_canvas_w","value":"2414.8"},{"label":"split_canvas_h","value":"1802.4"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086","type":"ImageService3","width":1689,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1621.7,1255.7 1689.0,1255.0 1689.0,810.4 1085.3,811.8 1098.1,1214.3 1621.7,1255.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__5/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1085.3,810.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2822409884867,41.76804074432565]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,810.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28080914071367,41.768172465216345]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,1261.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28067691433884,41.76737719883755]}},{"type":"Feature","properties":{"resourceCoords":[1085.3,1261.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28210876211187,41.76724547794686]}},{"type":"Feature","properties":{"resourceCoords":[1223.2,1229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.281791,41.767332]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__6/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p86 [6]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5632.4"},{"label":"split_canvas_w","value":"2142.4"},{"label":"split_canvas_h","value":"2399.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__6/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086","type":"ImageService3","width":1689,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2008.0 535.6,2008.0 535.0,1409.4 0.0,1408.1 0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0086__6/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1408.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28305986543947,41.76893359412295]}},{"type":"Feature","properties":{"resourceCoords":[535.6,1408.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28305667252252,41.76798124596239]}},{"type":"Feature","properties":{"resourceCoords":[535.6,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28448987000728,41.7679785873792]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28449306292423,41.76893093553976]}},{"type":"Feature","properties":{"resourceCoords":[407.7,1808.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2840129,41.7682069]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p89","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"23"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0089","type":"ImageService3","width":1643,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.0,1777.5 215.6,1046.7 -0.0,1044.7 -0.0,-0.0 1485.8,0.0 1484.7,984.4 1643.0,984.8 1643.0,1917.0 784.0,1912.8 784.9,1776.4 215.0,1777.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[786.0,1583.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3349047,41.7605946]}},{"type":"Feature","properties":{"resourceCoords":[785.0,617.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3343922,41.763957]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0009","type":"ImageService3","width":1670,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2008.0 -0.0,-0.0 1278.8,0.0 1314.4,334.7 1641.2,334.4 1635.4,2008.0 -0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33077640619855,41.76591987050345]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32687827434712,41.765578174343815]}},{"type":"Feature","properties":{"resourceCoords":[1670.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32742523500097,41.76205742577791]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3313233668524,41.76239912193755]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p90 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3519.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3172.8"},{"label":"split_canvas_h","value":"3845.2"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"962.0,890.4 1673.0,587.4 1673.0,0.0 879.8,-0.0 879.9,961.3 991.2,961.1 962.0,890.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[879.8,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.33039524403526,41.75463154564512]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3286682000517,41.75521460231241]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,961.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32771948130907,41.75365977395064]}},{"type":"Feature","properties":{"resourceCoords":[879.8,961.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32944652529264,41.75307671728335]}},{"type":"Feature","properties":{"resourceCoords":[481.2,409.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3308592,41.7536769]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p90 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3845.2"},{"label":"split_canvas_w","value":"3520.0"},{"label":"split_canvas_h","value":"4186.8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1885.5 880.0,2002.0 880.0,1457.9 880.0,1457.7 879.9,961.3 0.0,962.5 0.0,1885.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0090__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,961.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3461605803514,41.73023305205639]}},{"type":"Feature","properties":{"resourceCoords":[880.0,961.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34541150099237,41.731600310256205]}},{"type":"Feature","properties":{"resourceCoords":[880.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34324703984501,41.73093049259979]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34399611920404,41.729563234399976]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p91 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"4475.6"},{"label":"split_canvas_y","value":"2096.0"},{"label":"split_canvas_w","value":"2096.4"},{"label":"split_canvas_h","value":"2066.4"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091","type":"ImageService3","width":1643,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1643.0,532.4 1197.8,524.0 1118.9,621.9 1122.7,960.4 1123.6,1033.4 1643.0,1040.6 1643.0,532.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1118.9,524.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30513927534494,41.771948872360355]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,524.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30489453916915,41.77103400163189]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,1040.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30610807895188,41.77085438572453]}},{"type":"Feature","properties":{"resourceCoords":[1118.9,1040.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30635281512767,41.771769256453]}},{"type":"Feature","properties":{"resourceCoords":[1560.2,665.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3052659,41.7711294]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p91 [4]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"1858.4"},{"label":"split_canvas_y","value":"3837.2"},{"label":"split_canvas_w","value":"2662.4"},{"label":"split_canvas_h","value":"4194.8"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091","type":"ImageService3","width":1643,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"795.5,2008.0 795.9,1623.8 1130.2,1622.1 1129.3,1545.5 1123.6,1033.4 1122.7,960.4 503.4,959.3 567.0,1418.4 470.3,1414.4 464.6,2008.0 795.5,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0091__4/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[464.6,959.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.348869087345,41.755847740086296]}},{"type":"Feature","properties":{"resourceCoords":[1130.2,959.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34727825803742,41.75585435380008]}},{"type":"Feature","properties":{"resourceCoords":[1130.2,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34726425344465,41.7539905464803]}},{"type":"Feature","properties":{"resourceCoords":[464.6,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.34885508275222,41.753983932766516]}},{"type":"Feature","properties":{"resourceCoords":[715.5,992.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3482691,41.7557916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p92","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0092","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"207.2,2008.0 -0.0,2008.0 -0.0,575.8 16.9,578.0 7.2,659.5 863.6,737.9 873.0,126.1 1549.7,187.2 1540.4,585.1 1673.0,587.0 1673.0,2008.0 207.2,2008.0 207.2,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0092/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29833088170193,41.752539834957666]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29059022263601,41.75265579625241]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29040497669752,41.7456754360233]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29814563576343,41.74555947472855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0094__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p94 [4]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5658.4"},{"label":"split_canvas_w","value":"2399.2"},{"label":"split_canvas_h","value":"2373.6"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0094__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0094","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2008.0 599.7,2008.0 599.8,1414.6 0.0,1415.8 0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0094__4/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1414.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32277368006832,41.79802639581481]}},{"type":"Feature","properties":{"resourceCoords":[599.8,1414.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32136891315547,41.79783264863848]}},{"type":"Feature","properties":{"resourceCoords":[599.8,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.3216244057224,41.79678857346062]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32302917263526,41.79698232063694]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0095__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p95 [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":"1425.6"},{"label":"split_canvas_h","value":"2544.4"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0095__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0095","type":"ImageService3","width":1643,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.4,508.7 355.2,513.5 355.2,489.3 336.4,94.7 356.2,81.6 356.2,81.5 24.7,195.8 47.0,195.8 72.4,508.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0095__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[336.4,95.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2928811,41.753621]}},{"type":"Feature","properties":{"resourceCoords":[47.0,196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2943219,41.7533086]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p96","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0096","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"480.1,2008.0 483.5,1615.0 119.5,1586.0 115.1,1151.6 259.2,1105.2 353.5,323.0 -0.0,272.5 0.0,-0.0 1506.5,0.0 1508.5,716.5 1673.0,665.1 1673.0,1793.4 1515.7,1772.0 1518.5,2008.0 480.1,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0096/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2934483579421,41.757673196991895]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28560853421287,41.75770362195735]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28555992708864,41.75063439378521]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29339975081787,41.75060396881976]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p97","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0097","type":"ImageService3","width":1643,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1466.6,0.0 1371.0,731.1 1330.5,744.4 1328.4,1293.2 1427.0,1294.0 1422.1,1976.7 1326.9,1977.1 1326.9,2008.0 1148.9,2008.0 1149.5,1978.0 128.9,1968.9 125.6,1825.4 0.0,1823.0 0.0,-0.0 1466.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0097/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32210779812948,41.73795233087092]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.32122886347283,41.743643670216706]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31197230094753,41.742836484215594]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31285123560419,41.73714514486981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p98","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0098","type":"ImageService3","width":1673,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2008.0 0.0,0.0 660.6,0.0 666.5,141.4 1673.0,131.7 1673.0,368.9 1579.6,370.2 1580.7,448.4 1581.2,472.1 1583.0,493.8 1599.7,1644.7 1598.5,1856.2 1601.6,2008.0 0.0,2008.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0098/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31404187469131,41.735338731613176]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.31298857056939,41.74120133576562]}},{"type":"Feature","properties":{"resourceCoords":[1673.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30362481882567,41.74025132177941]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2008.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.30467812294759,41.73438871762696]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Aurora, Illinois | 1950 | sanborn01720_005 p99","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"}],"created":"2026-09-21T11:11:34Z","modified":"2026-09-21T11:11:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0099","type":"ImageService3","width":1634,"height":2008},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"102.3,609.4 223.2,604.7 214.8,396.8 448.8,396.4 448.8,479.2 914.4,478.5 914.0,263.1 970.0,255.1 969.0,439.4 1634.0,436.7 1634.0,1843.5 -0.0,1841.2 -0.0,1563.7 103.6,1563.4 102.3,609.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104am:g017201950:01720_1950-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[707.0,1841.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3080502,41.7404045]}},{"type":"Feature","properties":{"resourceCoords":[103.0,1841.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.3108446,41.7406564]}}]}}]}