{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn00440_003.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Calexico, California | 1920 | 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":"22"},{"label":"placed","value":"18"},{"label":"unplaced","value":"4"},{"label":"fit sources","value":"georef 11, georef-snap 7"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"3 sheet(s) cut into 7 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 32.66651,-115.49083 +/-100m); p4__1 (tier 1, 32.68032,-115.50786 +/-154m); p4__3 (tier 1, 32.68021,-115.50469 +/-100m); p6__1 (tier 1, 32.67445,-115.49602 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1894.3 126.0,1898.7 147.4,-0.0 1613.0,27.4 1613.0,1894.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49066650712552,32.67319261723774]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49067384980361,32.67015132623402]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4949287304321,32.670158708442244]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.494921387754,32.67319999944596]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p11","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1573.0,-0.0 1577.7,1913.0 -0.0,1913.0 -0.0,0.0 1573.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[445.0,1376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4895411,32.6718809]}},{"type":"Feature","properties":{"resourceCoords":[1572.0,1376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4895484,32.6698095]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1579.4,1201.1 1587.7,1793.1 1459.5,1791.0 1457.7,1913.0 -0.0,1913.0 12.9,0.0 1004.7,0.0 1004.6,49.5 1589.1,54.2 1580.4,1127.8 1613.0,1128.1 1613.0,1201.7 1579.4,1201.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0012/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.50209227101666,32.66991415338885]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49862917093365,32.66992864132929]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4986089025545,32.6664467606847]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.5020720026375,32.66643227274426]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p13","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,65.5 1613.0,61.8 1613.0,1809.3 -0.0,1816.9 -0.0,65.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[542.0,1261.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4974847,32.6698308]}},{"type":"Feature","properties":{"resourceCoords":[542.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4948914,32.6698208]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p14","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.6,1870.9 243.1,46.1 1613.0,50.5 1613.0,1872.9 1476.5,1874.2 1476.0,1913.0 1434.8,1913.0 1435.0,1873.8 235.6,1870.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[956.0,645.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4920942,32.6687834]}},{"type":"Feature","properties":{"resourceCoords":[956.0,1871.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4948842,32.6687786]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.8,1804.1 39.9,1771.0 -0.0,1771.6 -0.0,62.1 1613.0,-0.0 1613.0,1913.0 622.4,1913.0 622.5,1786.9 39.8,1804.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0015/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.494753563572,32.66778031914955]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49479102812421,32.664798365095486]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49896264529848,32.66483603358904]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49892518074627,32.667817987643105]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p16","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"572.5,1835.2 579.8,2.2 1613.0,-0.0 1613.0,1810.5 1578.8,1811.2 1578.5,1829.8 572.5,1835.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1583.0,599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4920748,32.6656097]}},{"type":"Feature","properties":{"resourceCoords":[1583.0,1230.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4935024,32.6656025]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.0,1913.0 30.8,41.5 1613.0,41.8 1613.0,1913.0 33.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49080797911455,32.66988136206199]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.48715488640084,32.669881330718326]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.48715493025006,32.66620842359633]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49080802296376,32.66620845494]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0018","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"165.1,21.8 1613.0,0.0 1613.0,1913.0 153.7,1913.0 165.1,21.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0018/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4875237521528,32.66984052107436]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4839230749488,32.669858914094384]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.48389734343989,32.66623870892785]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.48749802064388,32.66622031590783]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1559.0,1913.0 -0.0,1913.0 -0.0,0.0 1613.0,34.8 1613.0,567.1 1323.5,564.9 1316.6,1080.0 1566.3,1083.9 1559.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49625094761895,32.67914062494536]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49620884866683,32.67603383602755]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.50055565005492,32.67599151322273]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.50059774900704,32.679098302140545]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p3","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1501.9,683.8 1613.0,902.2 1613.0,1913.0 -0.0,1913.0 -0.0,-0.0 1362.6,0.0 1360.5,266.3 1501.9,683.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[659.0,669.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.5052136,32.6740172]}},{"type":"Feature","properties":{"resourceCoords":[659.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.5052229,32.6750492]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0004__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p4 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"1616.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4836.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0004__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"654.7,1515.7 654.8,1526.5 690.5,1623.5 690.8,1761.5 1558.2,1750.0 1556.8,175.2 1613.0,175.2 1613.0,0.0 404.0,0.0 417.8,557.9 556.7,926.9 548.7,1238.2 613.4,1414.0 654.7,1515.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0004__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1559.0,738.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.5011651,32.6750514]}},{"type":"Feature","properties":{"resourceCoords":[1008.5,168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.5023794,32.6761097]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p5 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4920.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"2732.0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"46.6,1346.0 46.0,1863.0 1576.0,1863.0 1577.7,1346.8 1089.7,1346.6 1079.0,1346.6 46.6,1346.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[46.0,1863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4999357,32.6729643]}},{"type":"Feature","properties":{"resourceCoords":[1576.0,1863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4999349,32.669833]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p5 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"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":"4921.2"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1575.8,1129.2 1579.2,102.5 42.2,101.0 44.8,878.4 -0.0,878.9 -0.0,1079.9 44.7,1079.9 44.6,1131.4 1575.8,1129.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0005__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[556.0,621.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4999343,32.6750519]}},{"type":"Feature","properties":{"resourceCoords":[1579.0,621.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4999357,32.6729643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0006__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p6 [2]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"16"},{"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":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0006__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"10.1,1427.2 202.8,1427.2 211.1,1913.0 1577.8,1913.0 1613.0,0.0 1023.7,0.0 1018.3,306.1 516.3,305.3 518.9,30.3 33.0,23.0 10.1,1427.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0006__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[510.0,946.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4974922,32.6747219]}},{"type":"Feature","properties":{"resourceCoords":[33.0,23.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4986706,32.6765808]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1562.8,1880.7 -0.0,1873.3 -0.0,0.0 1613.0,-0.0 1562.8,1880.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0007/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4906552918971,32.67597112446212]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.4906397663214,32.67288139415961]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49496254682795,32.67286578547497]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-115.49497807240365,32.67595551577748]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p8","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"125.0,0.0 1029.0,0.0 1028.0,109.0 1587.3,120.0 1566.5,1761.3 599.1,1753.7 596.6,1913.0 -0.0,1913.0 -0.0,738.8 121.1,739.4 125.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1028.0,109.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.501167,32.6729714]}},{"type":"Feature","properties":{"resourceCoords":[1566.0,1810.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4999349,32.669833]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Calexico, California | 1920 | sanborn00440_003 p9","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-23T04:43:05Z","modified":"2026-09-23T04:43:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1601.5,110.2 1613.0,1845.8 581.5,1848.2 558.6,110.8 1601.5,110.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004401920:00440_1920-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1031.0,1303.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4974938,32.6719208]}},{"type":"Feature","properties":{"resourceCoords":[1031.0,749.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-115.4962835,32.6719208]}}]}}]}