{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03603_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Frederick, Maryland | 1887 | mapsnap generated fit (2026-09-22)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-22"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"21"},{"label":"placed","value":"13"},{"label":"unplaced","value":"8"},{"label":"fit sources","value":"georef 7, georef-snap 6"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"4 sheet(s) cut into 9 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 39.42263,-77.42419 +/-241m); p14 (tier 1, 39.40795,-77.40970 +/-243m); p15__1 (tier 1, 39.40845,-77.39969 +/-124m); p15__2 (tier 1, 39.41147,-77.40408 +/-127m); p15__3 (tier 1, 39.41122,-77.40364 +/-188m); p16__1 (tier 1, 39.41266,-77.39643 +/-257m); p2__1 (tier 1, 39.41272,-77.42271 +/-203m); p2__2 (tier 1, 39.41306,-77.41843 +/-207m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0010/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6452.0,0.0 6452.0,3047.3 6018.4,2964.7 5999.9,4300.5 6018.6,5802.5 6452.0,5885.1 6452.0,7652.0 498.8,7652.0 362.1,0.0 6452.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41236781298726,39.420321574962884]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41200364482198,39.42316723563313]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40766539515374,39.422831241454695]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40802956331902,39.41998558078445]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0011/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6452.0,7652.0 -0.0,7652.0 -0.0,4778.1 214.5,4732.3 291.9,4487.3 199.3,200.1 6436.9,28.9 6452.0,3158.2 6297.7,5808.3 6452.0,5798.1 6452.0,7652.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40902764790987,39.41534248427865]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40525534761277,39.41500363502924]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40577186790442,39.41152277465132]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40954416820152,39.411861623900734]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p12","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0012/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"454.3,352.1 5764.4,429.7 5788.6,1101.4 6452.0,1096.8 6452.0,7652.0 1129.3,7652.0 1111.9,7236.8 474.2,6423.3 454.3,352.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[472.0,2664.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.407531,39.4151497]}},{"type":"Feature","properties":{"resourceCoords":[5828.0,6568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4048834,39.4174768]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p13","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0013/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 2666.7,327.6 5828.8,516.8 6452.0,1383.7 6452.0,7652.0 0.0,7652.0 0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0013/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40573761974885,39.41236958986375]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40555032017194,39.41528442471549]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40107374818498,39.415112884329666]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40126104776189,39.41219804947793]}},{"type":"Feature","properties":{"resourceCoords":[3208.0,1636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4046874,39.4137822]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0016__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 | 1887 | sanborn03603_001 p16 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"2179.2"},{"label":"split_canvas_y","value":"4804.0"},{"label":"split_canvas_w","value":"4272.8"},{"label":"split_canvas_h","value":"2848.0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0016__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0016/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6452.0,7652.0 6452.0,4804.0 2424.7,4958.6 2930.6,7649.6 6452.0,7652.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0016__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2626.9,6150.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.409591,39.422779]}},{"type":"Feature","properties":{"resourceCoords":[6332.1,6597.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4087685,39.424255]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0003/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,7435.0 0.0,-0.0 6452.0,0.0 6452.0,1351.8 5815.5,1161.4 6090.0,7524.0 3407.5,7484.7 3406.2,7582.5 0.0,7435.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41709830833936,39.40952744464101]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41679934449267,39.41240460593187]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41241374676791,39.412128729059376]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4127127106146,39.409251567768514]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0004/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6452.0,6778.4 699.9,6736.2 449.7,664.1 1056.7,847.0 1058.4,0.0 6452.0,0.0 6452.0,6778.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.4165834072522,39.411893234363625]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41627755901484,39.41490859556375]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41168113990462,39.41462637613536]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41198698814198,39.41161101493523]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__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 | 1887 | sanborn03603_001 p5 [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":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4544.0,0.0 3396.0,0.0 2909.2,0.0 2924.8,2494.8 1276.3,1970.7 1459.7,7218.6 3219.3,7184.8 3176.9,5586.3 4483.1,5542.6 4506.6,7179.3 5952.6,7175.5 5858.0,3633.2 6452.0,3747.6 6452.0,0.0 4544.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[560.0,7236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4122561,39.4142517]}},{"type":"Feature","properties":{"resourceCoords":[5856.0,3632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4140014,39.4168242]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__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 | 1887 | sanborn03603_001 p5 [2]","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":"2924.8"},{"label":"split_canvas_h","value":"2494.8"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1362.3,0.0 1375.4,483.7 1076.3,434.6 1157.0,1932.8 1945.6,2183.5 2541.4,2166.5 2499.5,1356.1 2917.5,1332.3 2909.2,0.0 1362.3,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0005__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41468326256813,39.4159159177332]}},{"type":"Feature","properties":{"resourceCoords":[2924.8,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41420064753619,39.41853474639145]}},{"type":"Feature","properties":{"resourceCoords":[2924.8,2494.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41130580254318,39.418216607296706]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2494.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41178841757512,39.41559777863846]}},{"type":"Feature","properties":{"resourceCoords":[1076.3,435.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4140014,39.4168242]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0006/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7652.0 -0.0,6426.9 385.4,6430.5 427.6,6249.6 530.2,368.6 6452.0,288.6 6452.0,7652.0 -0.0,7652.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41279416191068,39.412154100227326]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40907727067008,39.411947267500004]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40939253920685,39.408517381494114]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41310943044745,39.40872421422144]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p7","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0007/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6151.2,7652.0 6142.3,7313.6 486.8,7534.9 413.8,51.8 5700.2,0.0 5720.0,4195.9 5640.6,4434.8 5431.0,4475.8 5383.9,7293.7 6452.0,7303.2 6452.0,7652.0 6151.2,7652.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2532.0,2592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4109832,39.414176]}},{"type":"Feature","properties":{"resourceCoords":[2536.0,7436.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4112667,39.4119249]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p8","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0008/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5902.1,1752.1 5884.3,7116.2 451.3,6979.2 499.0,0.0 1793.8,0.0 1762.7,1621.2 5902.1,1752.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3204.0,3780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.410682,39.41661]}},{"type":"Feature","properties":{"resourceCoords":[488.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.412108,39.4154526]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Frederick, Maryland | 1887 | sanborn03603_001 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-22T19:23:21Z","modified":"2026-09-22T19:23:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0009/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6452.0,134.9 5949.1,127.7 5976.1,7487.0 6452.0,7493.7 6452.0,7652.0 516.5,7652.0 494.3,0.0 6452.0,0.0 6452.0,134.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844fm:g3844fm_g036031887:03603_1887-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41272215929979,39.41775397186907]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.41239747084956,39.42071727471389]}},{"type":"Feature","properties":{"resourceCoords":[6452.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40788003467222,39.420417695237106]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7652.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-77.40820472312245,39.41745439239229]}}]}}]}