{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01846_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Elgin, Illinois | 1891 | mapsnap generated fit (2026-09-23)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-23"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"40"},{"label":"placed","value":"26"},{"label":"unplaced","value":"14"},{"label":"fit sources","value":"georef 17, georef-snap 6, snap:0 2, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"11 sheet(s) cut into 26 panels"},{"label":"unplaced pages","value":"p20__1 (tier 2, 42.03819,-88.28566 +/-100m); p20__3 (tier 2, 42.03819,-88.28566 +/-100m); p20__4 (tier 1, 42.03538,-88.29579 +/-135m); p21__1 (tier 1, 42.04788,-88.28930 +/-100m); p21__2 (tier 1, 42.04872,-88.28748 +/-232m); p21__3 (tier 1, 42.04516,-88.28832 +/-214m); p22__2 (tier 1, 42.04916,-88.27840 +/-100m); p23 (tier 1, 42.04146,-88.28878 +/-256m); p24__1 (tier 1, 42.04533,-88.27545 +/-111m); p24__2 (tier 1, 42.04450,-88.27720 +/-100m); p25__1 (tier 1, 42.04479,-88.27547 +/-254m); p25__2 (tier 1, 42.04785,-88.27177 +/-116m); p2__2 (tier 1, 42.03678,-88.28043 +/-100m); p3__1 (tier 2, 42.04431,-88.28040 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p1","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"562.0,1187.5 584.5,1109.7 -0.0,764.4 600.7,843.1 316.1,133.4 619.0,0.0 1151.5,0.0 1566.4,955.7 1608.7,961.1 1613.0,1834.5 562.0,1187.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0001/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27648239008238,42.0350057142017]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27253881246335,42.03371691225432]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27458233282927,42.03021859806317]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2785259104483,42.03150740001056]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1833.0 -0.0,173.0 826.5,168.7 909.4,0.0 1613.0,0.0 1613.0,1748.6 520.1,1752.5 520.4,1825.8 1.1,1833.3 -0.0,1833.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28025234146615,42.044053803185626]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27624853030707,42.04403134167251]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27628414925114,42.040479997530504]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28028796041022,42.04050245904362]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1886.7 -0.0,1882.3 -0.0,0.7 1613.0,0.0 1613.0,1886.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27899401315891,42.040794584748156]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27491619484134,42.040784550555465]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27493210600402,42.037167374908186]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27900992432158,42.03717740910088]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p12","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1550.7,-0.0 1568.8,1913.0 87.8,1913.0 78.8,-0.0 1550.7,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1065.0,731.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2781612,42.0354184]}},{"type":"Feature","properties":{"resourceCoords":[579.0,1321.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796155,42.036326]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p13 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3049.6"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"4602.4"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"81.3,1848.0 1529.3,1858.7 1526.8,1309.6 1613.0,1112.4 1613.0,762.4 510.4,764.8 510.3,796.1 86.9,799.7 81.3,1848.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1043.0,796.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2736692,42.0354164]}},{"type":"Feature","properties":{"resourceCoords":[84.0,1657.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2758383,42.0372204]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p13 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3063.6"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,0.0 -0.0,-0.0 42.3,765.8 1613.0,762.4 1613.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0013__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1044.0,379.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.271111,42.0371411]}},{"type":"Feature","properties":{"resourceCoords":[1253.0,379.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2705771,42.03714]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p14 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,-0.0 1544.5,-0.0 718.6,433.2 -0.0,1619.6 -0.0,1913.0 1178.0,1913.0 1456.0,1913.0 1613.0,1913.0 1613.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1600.0,1250.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2798845,42.0323977]}},{"type":"Feature","properties":{"resourceCoords":[957.0,33.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2781688,42.0345105]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p14 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3658.0"},{"label":"split_canvas_h","value":"6248.8"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.0,87.0 73.4,1436.8 850.1,110.0 71.0,87.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0014__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[71.0,1038.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2781688,42.0345105]}},{"type":"Feature","properties":{"resourceCoords":[71.0,87.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2758521,42.0345092]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p15","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1607.0 -0.0,187.8 1603.3,335.0 1613.0,1034.0 1528.0,1055.5 1535.0,1866.7 -0.0,1607.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[407.0,1683.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.277692,42.0302349]}},{"type":"Feature","properties":{"resourceCoords":[1535.0,1867.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2751738,42.0311913]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p16","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1081.8,1380.5 1042.9,1357.6 1032.9,250.0 714.1,113.8 1064.0,110.9 1063.0,0.0 1613.0,0.0 1613.0,1913.0 862.4,1913.0 1081.8,1380.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1040.0,874.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2736667,42.0329145]}},{"type":"Feature","properties":{"resourceCoords":[167.0,34.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2758521,42.0345092]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1913.0 -0.0,71.2 1521.7,50.1 1574.9,560.1 1613.0,527.0 1613.0,1913.0 -0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27870783709508,42.03004180057054]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27501932220986,42.03135121129421]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27294332280093,42.02807884874646]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27663183768615,42.02676943802279]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0018","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1913.0 39.5,-0.0 1613.0,-0.0 1613.0,1913.0 -0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0018/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28630475459508,42.036940906818785]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28427995992598,42.0343542626533]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28838131322918,42.03255807502693]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29040610789828,42.03514471919241]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p19 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4124.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3528.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"53.7,1515.4 -0.0,1516.9 0.0,1538.5 -0.0,1913.0 1613.0,1913.0 1613.0,1866.8 1578.9,1865.2 1612.4,1045.8 165.0,1032.5 75.3,1323.3 242.2,1324.1 244.3,1389.0 60.9,1394.8 53.7,1515.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1117.0,1369.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28971,42.039606]}},{"type":"Feature","properties":{"resourceCoords":[1580.0,1369.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2891012,42.0388217]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p19 [2]","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":"6452.0"},{"label":"split_canvas_h","value":"4183.2"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1513.3,1039.5 1516.9,64.2 1613.0,63.3 1613.0,-0.0 -0.0,0.0 -0.0,175.3 129.6,174.7 99.5,1019.1 1513.3,1039.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0019__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,516.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2884911,42.0380261]}},{"type":"Feature","properties":{"resourceCoords":[98.0,516.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2891012,42.0388217]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0020__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p20 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"3238.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3214.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0020__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0020","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1009.9,1738.9 1313.2,1843.0 1311.2,1913.0 1613.0,1913.0 1613.0,1691.1 1613.0,0.0 809.5,-0.0 810.1,553.2 810.5,909.6 811.4,1709.9 935.4,1721.5 936.4,1913.0 1004.4,1913.0 1009.9,1738.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0020__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[809.5,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29369521632353,42.04399469185118]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29197837893352,42.0447870941468]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2894574144292,42.04173199013992]}},{"type":"Feature","properties":{"resourceCoords":[809.5,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2911742518192,42.040939587844306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0022__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p22 [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":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0022__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0022","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1456.9,0.0 1374.7,0.0 -0.0,-0.0 -0.0,1913.0 528.0,1913.0 813.6,1913.0 1086.0,1913.0 1086.0,1361.5 1613.0,1361.5 1613.0,0.0 1456.9,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0022__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[103.0,1377.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796601,42.053286]}},{"type":"Feature","properties":{"resourceCoords":[103.0,479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796393,42.0569207]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0024__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p24 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3767.2"},{"label":"split_canvas_y","value":"5108.0"},{"label":"split_canvas_w","value":"2684.8"},{"label":"split_canvas_h","value":"2544.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0024__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0024","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1283.7 954.4,1277.2 941.8,1277.0 954.0,1381.5 952.2,1913.0 1613.0,1913.0 1613.0,1283.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0024__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[941.8,1277.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2777468062405,42.04578959168703]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1277.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2760552251766,42.04571026158805]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27615616200819,42.04451941222656]}},{"type":"Feature","properties":{"resourceCoords":[941.8,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27784774307209,42.04459874232555]}},{"type":"Feature","properties":{"resourceCoords":[1344.3,1369.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2767479,42.0455698]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p2 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1491.3,731.9 1485.1,144.8 75.3,145.2 81.6,1691.1 170.9,1913.0 648.9,1913.0 1059.5,1668.7 1060.2,1147.1 1613.0,1146.3 1613.0,929.2 1491.3,731.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[75.0,709.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825446,42.0372547]}},{"type":"Feature","properties":{"resourceCoords":[1021.0,709.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825695,42.0354228]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0003__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p3 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0003__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"364.4,1913.0 562.3,1837.5 1590.0,1831.0 1586.8,118.3 -0.0,125.1 0.0,1413.7 158.7,1415.4 344.7,1703.3 342.2,1913.0 364.4,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0003__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1590.0,581.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825145,42.0395679]}},{"type":"Feature","properties":{"resourceCoords":[1590.0,1831.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825446,42.0372547]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"8.6,1821.4 33.9,115.6 614.0,122.2 612.9,193.8 826.0,196.0 931.5,0.0 1450.5,0.0 1431.6,1841.7 8.6,1821.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28259737581263,42.04063836311664]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27859085528912,42.04065911708041]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27855794589695,42.037105179710544]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28256446642045,42.03708442574678]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p5","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"603.8,1779.0 603.2,1913.0 -0.0,1913.0 -0.0,-0.0 1588.7,18.2 1590.8,1779.3 603.8,1779.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0005/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2879708,42.0437902]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2838878,42.0437747]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28391260000001,42.0401784]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2879956,42.0401939]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"42.7,43.9 1540.9,42.9 1534.3,1714.0 1431.2,1913.0 1216.6,1913.0 1216.9,1840.9 42.0,1839.2 42.7,43.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28405466519574,42.04382192847972]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28007748245213,42.04381138666903]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2800941993349,42.04028364586982]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28407138207851,42.040294187680516]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p7","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1529.8,1913.0 -0.0,1913.0 -0.0,45.7 1554.8,49.4 1529.8,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1073.0,1211.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2853955,42.0446354]}},{"type":"Feature","properties":{"resourceCoords":[106.0,630.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2839462,42.04643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p8 [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":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1913.0 1613.0,413.4 1257.1,413.2 1256.0,0.0 -0.0,-0.0 -0.0,1862.6 1613.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[819.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796304,42.0472769]}},{"type":"Feature","properties":{"resourceCoords":[819.0,21.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796668,42.0499218]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p8 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"5024.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1428.0"},{"label":"split_canvas_h","value":"1653.6"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,0.0 1256.0,-0.0 1257.0,369.3 1613.0,375.9 1613.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0008__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1256.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28051462255993,42.050613364296744]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27961183005515,42.050626260879824]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,413.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.27959182841937,42.049851565188575]}},{"type":"Feature","properties":{"resourceCoords":[1256.0,413.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28049462092416,42.049838668605496]}},{"type":"Feature","properties":{"resourceCoords":[1584.1,375.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796668,42.0499218]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1891 | sanborn01846_002 p9","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-23T01:28:46Z","modified":"2026-09-23T01:28:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1531.7,132.1 1530.4,1853.8 -0.0,1856.8 -0.0,1544.2 81.5,1543.0 83.0,-0.0 1363.0,-0.0 1362.8,48.9 1531.7,132.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461891:01846_1891-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[81.0,709.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796277,42.046417]}},{"type":"Feature","properties":{"resourceCoords":[1051.0,1853.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2824867,42.0446303]}}]}}]}