{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03603_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Frederick, Maryland | 1892 | 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":"27"},{"label":"placed","value":"14"},{"label":"unplaced","value":"13"},{"label":"fit sources","value":"georef 10, georef-snap 3, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"8 sheet(s) cut into 17 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 39.40914,-77.39900 +/-122m); p12 (tier 1, 39.41346,-77.40731 +/-253m); p13__1 (tier 1, 39.41485,-77.40427 +/-107m); p13__2 (tier 1, 39.41370,-77.40340 +/-254m); p15 (tier 1, 39.40915,-77.41040 +/-256m); p16__1 (tier 3, 39.41061,-77.41056 +/-833m); p17__1 (tier 1, 39.42351,-77.40839 +/-250m); p18__1 (tier 1, 39.41229,-77.40352 +/-100m); p18__2 (tier 1, 39.41103,-77.40383 +/-100m); p2__2 (tier 1, 39.41701,-77.41301 +/-195m); p4__1 (tier 1, 39.41338,-77.41785 +/-102m); p4__2 (tier 1, 39.41325,-77.41753 +/-211m); p7__2 (tier 4, 39.41528,-77.41189 +/-940m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p10","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1448.4,71.3 1473.1,1021.0 1613.0,1020.5 1613.0,1913.0 0.0,1913.0 0.0,59.1 1448.4,71.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4090867,39.4150833]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4087148,39.4180215]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40420429999999,39.4176808]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4045762,39.4147426]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p11","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1427.0,22.9 1426.1,112.3 1613.0,113.8 1613.0,1828.9 125.8,1875.1 122.0,28.0 1427.0,22.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[640.0,659.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4109832,39.414176]}},{"type":"Feature","properties":{"resourceCoords":[122.0,28.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.412108,39.4154526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p14","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1913.0 -0.0,1579.3 85.1,1593.9 110.0,93.0 1007.0,76.1 979.5,651.8 1613.0,682.0 1613.0,1913.0 -0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[119.0,775.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4125947,39.410773]}},{"type":"Feature","properties":{"resourceCoords":[110.0,93.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4125039,39.4119719]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p16 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"3140.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3311.6"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"819.2,1913.0 810.5,1762.3 863.6,1588.4 1613.0,1545.1 1613.0,0.0 785.1,-0.0 788.9,769.1 794.6,1913.0 819.2,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[879.1,570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.421303,39.4105987]}},{"type":"Feature","properties":{"resourceCoords":[1251.0,682.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4208999,39.4112977]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p16 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3076.4"},{"label":"split_canvas_w","value":"3178.4"},{"label":"split_canvas_h","value":"4575.6"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1913.0 794.6,1913.0 792.3,1447.0 599.0,1452.8 562.6,770.0 0.0,772.4 0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0016__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,769.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41061853662859,39.41088100588424]}},{"type":"Feature","properties":{"resourceCoords":[794.6,769.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41039745712317,39.41230399479728]}},{"type":"Feature","properties":{"resourceCoords":[794.6,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40774583625266,39.412058322400014]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40796691575808,39.41063533348698]}},{"type":"Feature","properties":{"resourceCoords":[381.8,1817.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4080832,39.4113397]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0017__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p17 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"2136.4"},{"label":"split_canvas_y","value":"4792.4"},{"label":"split_canvas_w","value":"4315.6"},{"label":"split_canvas_h","value":"2859.6"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0017__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1913.0 1613.0,1198.1 599.6,1243.8 716.1,1913.0 1613.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0017__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[644.1,1527.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.409591,39.422779]}},{"type":"Feature","properties":{"resourceCoords":[1559.0,1651.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4087685,39.424255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p2 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"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":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1509.2,1350.8 1613.0,1350.1 1613.0,0.0 1398.1,0.0 1328.0,0.0 1240.2,0.0 746.7,0.0 747.1,621.1 363.7,496.4 364.6,601.2 0.0,518.0 0.0,1089.7 86.2,1298.9 95.2,1805.3 1517.6,1816.1 1509.2,1350.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[797.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4145498,39.4156333]}},{"type":"Feature","properties":{"resourceCoords":[797.0,1805.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.412108,39.4154526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,562.4 1283.4,483.5 1278.5,1004.4 1354.8,1196.1 1358.7,1658.2 153.0,1659.6 81.0,159.9 0.0,142.1 -0.0,0.0 1613.0,0.0 1613.0,562.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41656854831625,39.41195165033159]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41623248879598,39.41500127066104]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41158385892253,39.41469117319769]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41191991844279,39.41164155286824]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p5 [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":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1838.3 295.4,1841.4 280.6,0.0 -0.0,0.0 0.0,1838.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,21.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.416656,39.411018]}},{"type":"Feature","properties":{"resourceCoords":[832.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4125947,39.410773]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p5 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3477.6"},{"label":"split_canvas_y","value":"2064.8"},{"label":"split_canvas_w","value":"2974.4"},{"label":"split_canvas_h","value":"5587.2"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1455.6,1815.0 1430.5,1033.6 1388.0,1021.3 1389.2,947.1 1613.0,950.4 1613.0,557.6 1613.0,554.6 1482.5,548.4 1458.3,546.6 1065.3,516.2 1065.2,516.4 882.3,847.7 869.4,871.0 874.2,1079.7 886.1,1598.7 889.2,1732.4 890.4,1787.7 890.6,1804.7 1455.6,1815.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0005__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[869.4,516.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41874539543637,39.41018973406561]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,516.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41850264372275,39.412865682054]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41199607299602,39.412513688461026]}},{"type":"Feature","properties":{"resourceCoords":[869.4,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41223882470965,39.40983774047264]}},{"type":"Feature","properties":{"resourceCoords":[1455.1,1815.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4125039,39.4119719]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,0.0 1613.0,798.4 1490.8,774.2 1476.5,1482.5 1613.0,1509.5 1613.0,1913.0 238.1,1913.0 240.0,1790.3 105.5,1787.8 109.9,0.0 1613.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41238783008515,39.420286153375265]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41209571174103,39.423172668357545]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40769517868931,39.42290314986791]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40798729703343,39.420016634885634]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0007__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p7 [1]","metadata":[{"label":"streets","value":"5"},{"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":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0007__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,762.5 144.8,763.3 146.7,1701.3 1465.6,1724.8 1464.5,835.8 1613.0,834.9 1613.0,0.0 1322.7,0.0 1316.3,285.5 965.3,281.8 966.4,0.0 0.0,-0.0 0.0,762.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0007__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[797.0,1716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.410343,39.4190753]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,707.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4126855,39.4205006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.2,157.9 1471.1,169.0 1482.8,979.3 1613.0,979.6 1613.0,1913.0 143.2,1913.0 117.2,157.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0008/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4109150012009,39.41765457150027]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41055260141071,39.42063467222152]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40600956528448,39.42030029714781]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40637196507467,39.417320196426566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1892 | sanborn03603_002 p9","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-23T02:08:38Z","modified":"2026-09-23T02:08:38Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"132.6,1719.0 128.0,410.0 784.8,424.1 779.7,0.0 1441.9,0.0 1448.5,1740.9 132.6,1719.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031892:03603_1892-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[128.0,410.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.412108,39.4154526]}},{"type":"Feature","properties":{"resourceCoords":[1449.0,948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4105136,39.4178434]}}]}}]}