{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03573_031.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Baltimore, Maryland | 1950 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"130"},{"label":"placed","value":"111"},{"label":"unplaced","value":"19"},{"label":"fit sources","value":"georef 60, georef-snap 48, georef-street 2, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"16 sheet(s) cut into 35 panels"},{"label":"unplaced pages","value":"p0 (tier 1, 39.29624,-76.66384 +/-254m); p1221 (tier 1, 39.26659,-76.66908 +/-255m); p1227__1 (tier 1, 39.29340,-76.69285 +/-172m); p1241__2 (tier 1, 39.28987,-76.67439 +/-100m); p1244__2 (tier 1, 39.28625,-76.68563 +/-100m); p1249__2 (tier 2, 39.27986,-76.67059 +/-303m); p1257__2 (tier 1, 39.28373,-76.65885 +/-100m); p1265 (tier 1, 39.27986,-76.65483 +/-262m); p1267__2 (tier 4, 39.29323,-76.67166 +/-3776m); p1269__1 (tier 4, 39.29323,-76.67166 +/-3776m); p1277__1 (tier 2, 39.28876,-76.70492 +/-186m); p1281__1 (tier 1, 39.28728,-76.70902 +/-248m); p1281__2 (tier 1, 39.30216,-76.68549 +/-100m); p826__2 (tier 1, 39.30828,-76.67443 +/-100m); p830__2 (tier 2, 39.30920,-76.65978 +/-156m); p830__3 (tier 2, 39.30920,-76.65978 +/-156m); p838__2 (tier 2, 39.31218,-76.66741 +/-1476m); p890__3 (tier 4, 39.29323,-76.67166 +/-3776m); p890__4 (tier 4, 39.29323,-76.67166 +/-3776m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1201/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1201","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1201/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1201","type":"ImageService3","width":1418,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 1268.3,185.1 1291.7,235.0 1303.0,1751.7 -0.0,1766.1 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1201/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1299.0,1296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6582055,39.2856934]}},{"type":"Feature","properties":{"resourceCoords":[1299.0,748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6584683,39.2866546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1202/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1202","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1202/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1202","type":"ImageService3","width":1436,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.8,107.7 1436.0,316.4 1356.0,1400.1 1010.3,1347.5 913.8,1914.7 96.2,1791.1 79.0,157.1 55.8,107.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1202/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6589867571475,39.28780157717177]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65571764628146,39.288340655840905]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65473609806473,39.284724312653914]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65800520893077,39.28418523398478]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1203/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1203","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1203/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1203","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1344.5,220.4 1136.9,184.0 1105.5,349.3 1427.0,753.3 1427.0,798.0 1149.2,832.2 1289.3,1807.8 199.1,2020.5 105.8,1093.9 208.1,23.4 1386.6,0.0 1344.5,220.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1203/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65605413439808,39.287734046179196]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65278714652473,39.28833019138412]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65169484662489,39.284693402451204]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65496183449824,39.28409725724628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1204/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1204","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"28"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1204/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1204","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"316.2,781.8 435.8,780.4 -0.0,399.6 -0.0,230.9 209.7,227.9 209.8,3.0 -0.0,43.3 -0.0,-0.0 1392.5,0.0 1396.1,1852.8 809.0,1868.0 808.9,1773.2 450.9,1800.7 132.6,866.8 316.2,781.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1204/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[802.0,501.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6514324,39.2874484]}},{"type":"Feature","properties":{"resourceCoords":[809.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6512812,39.284951]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1205/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1205","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1205/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1205","type":"ImageService3","width":1424,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"46.2,1774.5 47.1,0.0 1424.0,0.0 1424.0,1781.3 46.2,1774.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1205/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65020265628254,39.288458270313306]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64686404256862,39.28857556877589]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64664866591106,39.28485123804321]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64998727962498,39.284733939580626]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1206/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1206","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1206/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1206","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.6,0.0 1440.0,0.0 1440.0,1433.5 1344.3,1187.5 78.9,1672.3 56.3,1614.5 50.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1206/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6500249333232,39.28521556055351]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64666212483458,39.28532066823161]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64647128534655,39.28161085787147]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.64983409383517,39.28150575019337]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1207/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1207","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1207/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1207","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"209.0,2038.0 -0.0,2038.0 -0.0,0.0 1317.6,0.0 1319.7,1352.8 402.7,1833.8 209.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1207/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[888.0,923.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.658488,39.283095]}},{"type":"Feature","properties":{"resourceCoords":[644.0,1705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6586458,39.281617]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1208/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1208","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1208/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1208","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"69.6,1977.0 64.3,754.5 884.5,885.6 986.2,316.6 1333.0,372.4 1440.0,1311.6 1258.3,1364.3 69.6,1977.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1208/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65842662021713,39.28596491597519]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65516918905654,39.28652436717192]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6541534026449,39.28293086071155]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65741083380549,39.28237140951482]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1209/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1209","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1209/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1209","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1427.0,1919.1 1427.0,2038.0 -0.0,2038.0 60.1,1497.6 204.8,1549.8 209.3,1484.2 178.5,1302.8 113.5,1283.4 152.4,1209.5 61.9,941.4 63.8,225.4 684.3,228.0 1427.0,530.8 1427.0,1918.3 1427.0,1919.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1209/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65756193010098,39.28247735425466]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65542875579888,39.28051303809112]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6590276110935,39.278138201335075]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66116078539561,39.28010251749861]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1210/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1210","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1210/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1210","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1440.0,215.9 1440.0,1762.8 253.2,1793.9 288.8,1237.1 96.2,659.0 1440.0,215.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1210/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65864651036033,39.28318721769522]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65549186655865,39.2841601478307]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65372539633385,39.2806799090811]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65688004013553,39.279706978945626]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1211/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1211","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1211/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1211","type":"ImageService3","width":1424,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1074.8,1839.2 445.1,1956.5 191.9,334.1 436.7,215.9 1403.8,20.1 1074.8,1839.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1211/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65591896310382,39.2843124619706]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65264654599595,39.2848879799295]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65158987170729,39.28123729145057]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65486228881515,39.28066177349167]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1212/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1212","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"26"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1212/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1212","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1315.0,1539.8 123.2,1987.2 138.8,123.5 446.5,0.0 737.1,0.0 736.4,95.2 1325.9,85.4 1315.0,1539.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1212/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1029.0,574.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6505358,39.2841071]}},{"type":"Feature","properties":{"resourceCoords":[426.0,1204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6518776,39.282905]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1213/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1213","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1213/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1213","type":"ImageService3","width":1421,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1335.0,230.4 1352.7,0.0 1421.0,0.0 1421.0,247.1 1333.3,245.2 1275.7,757.0 1421.0,756.0 1421.0,793.6 1271.5,795.9 1234.2,1150.2 1120.2,1150.8 1137.5,2038.0 -0.0,2038.0 -0.0,820.4 28.8,803.1 -0.0,759.2 28.2,758.7 27.3,641.2 1335.0,230.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1213/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65945739160794,39.27933751504246]}},{"type":"Feature","properties":{"resourceCoords":[1421.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65638950558304,39.28034322434011]}},{"type":"Feature","properties":{"resourceCoords":[1421.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65453920732871,39.27691325568982]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65760709335362,39.27590754639217]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1214/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1214","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1214/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1214","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.5,784.8 308.4,784.5 307.2,746.9 162.4,745.9 252.7,0.0 1443.6,0.0 1439.7,95.7 1322.0,95.0 1322.0,754.2 1444.0,755.1 1444.0,2038.0 -0.0,2038.0 -0.0,1138.0 113.6,1139.0 157.5,784.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1214/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1322.0,774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6534918,39.2797705]}},{"type":"Feature","properties":{"resourceCoords":[1322.0,409.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6538379,39.2803789]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1215/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1215","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1215/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1215","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"457.1,761.4 333.1,761.9 325.3,91.8 1097.4,87.5 1084.3,758.6 985.7,759.1 993.6,2038.0 471.9,2038.0 457.1,761.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1215/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1083.0,419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6522249,39.2808957]}},{"type":"Feature","properties":{"resourceCoords":[329.0,411.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6538379,39.2803789]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1216/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1216","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1216/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1216","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,759.0 96.9,759.1 113.8,99.5 1385.8,98.5 1363.8,765.0 1280.9,765.0 1280.8,803.0 1365.1,803.4 1367.0,1199.0 1444.0,1327.9 1444.0,2038.0 -0.0,2038.0 -0.0,759.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1216/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[730.0,427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6508568,39.2813516]}},{"type":"Feature","properties":{"resourceCoords":[1367.0,1199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6487565,39.2805226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1217/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1217","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1217/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1217","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"86.0,218.8 85.6,0.0 1430.0,0.0 1430.0,2038.0 -0.0,2038.0 -0.0,1826.4 163.9,1826.3 163.4,1117.0 86.4,988.3 -0.0,554.9 86.0,218.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1217/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[719.0,991.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6473848,39.2809767]}},{"type":"Feature","properties":{"resourceCoords":[719.0,220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6481071,39.282268]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1220/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1220","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1220/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1220","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"75.7,118.3 774.2,118.6 779.1,595.1 846.9,595.8 1444.0,298.2 1444.0,2038.0 71.3,2038.0 75.7,118.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1220/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6611107957995,39.2946888709324]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66095611630297,39.29203577056796]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66576056836993,39.29186562660775]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66591524786647,39.294518726972186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1222/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1222","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1222/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1222","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1364.4,1302.8 1444.0,1289.8 1444.0,2038.0 -0.0,2038.0 -0.0,601.0 595.4,390.5 1345.8,11.7 1364.4,1302.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1222/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65893222446842,39.29004363462537]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65877010038326,39.28745658777027]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66345455352116,39.28727824031911]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66361667760631,39.28986528717421]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1223/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1223","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1223/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1223","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,735.5 470.7,725.3 463.2,35.1 1430.0,21.5 1430.0,798.9 1430.0,2038.0 609.3,2038.0 -0.0,804.6 -0.0,735.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1223/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66249000538454,39.29457582548166]}},{"type":"Feature","properties":{"resourceCoords":[1430.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65907703875402,39.29466650223755]}},{"type":"Feature","properties":{"resourceCoords":[1430.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65891122748648,39.29087553299054]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.662324194117,39.29078485623465]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1224/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1224","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1224/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1224","type":"ImageService3","width":1441,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"198.6,2038.0 214.2,29.1 1441.0,25.1 1441.0,2038.0 198.6,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1224/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65958179001703,39.29466344064698]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65619342238745,39.29477400915145]}},{"type":"Feature","properties":{"resourceCoords":[1441.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65599278032032,39.29103909723681]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6593811479499,39.29092852873234]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1225/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1225","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1225/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1225","type":"ImageService3","width":1431,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,640.3 0.0,0.0 61.4,0.0 144.0,167.2 987.8,140.2 987.8,129.5 1431.0,126.1 1431.0,677.5 1267.6,1951.0 971.0,1959.7 584.9,1221.7 339.7,635.3 -0.0,640.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1225/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66121742222361,39.29111704405655]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65789569590929,39.291205453391065]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65773415188494,39.28751822395192]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66105587819926,39.287429814617404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1226/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1226","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1226/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1226","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1299.1 -0.0,1009.8 513.4,696.2 525.1,145.8 1339.5,157.0 1341.6,0.0 1444.0,0.0 1444.0,1934.5 1284.6,1962.7 323.0,1963.9 -0.0,1299.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1226/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65912432666507,39.291188444379465]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65577020197448,39.29133383433269]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65550693230831,39.287644170912806]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6588610569989,39.28749878095958]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1227__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1227 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5720.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1227__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1227","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,147.2 0.0,903.3 1288.3,2038.0 1430.0,2038.0 1430.0,143.9 -0.0,147.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1227__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[678.0,830.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6825278,39.2924639]}},{"type":"Feature","properties":{"resourceCoords":[1106.0,1296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.681477,39.2916462]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1228/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1228","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1228/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1228","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.0,1786.6 1338.0,1786.3 1337.5,1866.1 770.7,1858.0 551.6,2003.9 574.4,2038.0 275.7,2038.0 292.1,132.4 1348.0,134.1 1341.0,1298.0 1444.0,1298.0 1444.0,1786.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1228/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[376.0,1298.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6804959,39.2916834]}},{"type":"Feature","properties":{"resourceCoords":[1341.0,1298.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6782597,39.2917671]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1229/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1229","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1229/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1229","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"219.8,1224.2 118.8,1225.2 114.3,83.8 1311.3,77.5 1313.4,1513.3 1338.8,1643.9 1409.3,1729.1 1150.2,2038.0 948.9,2038.0 722.0,1803.5 696.4,1870.0 509.4,2038.0 121.4,2038.0 120.7,1704.0 224.6,1703.2 219.8,1224.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1229/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[716.0,1219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6768477,39.2918203]}},{"type":"Feature","properties":{"resourceCoords":[117.0,758.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6783064,39.2926221]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1230/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1230","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"24"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1230/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1230","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.0,0.0 1444.0,1607.0 1444.0,1607.0 1444.0,2038.0 1302.8,1998.3 462.6,2038.0 157.2,1720.2 102.0,1596.8 101.5,0.0 1444.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1230/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[835.0,1304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6737252,39.2918102]}},{"type":"Feature","properties":{"resourceCoords":[106.0,763.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6754712,39.2927318]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1231/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1231","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1231/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1231","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"600.7,543.0 606.4,0.0 928.0,0.0 851.9,80.0 1423.0,615.8 1423.0,2038.0 61.0,2038.0 43.9,1824.4 118.6,1825.5 138.7,334.6 352.5,474.6 600.7,543.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1231/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68249115521897,39.28510432054645]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67914784285051,39.28523574979795]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67890636194944,39.281503379187974]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6822496743179,39.28137194993648]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1232/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1232","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1232/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1232","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1060.7,1468.5 1436.5,1482.4 1417.4,2038.0 0.0,2038.0 0.0,497.4 1136.0,263.1 1104.0,514.4 776.1,1049.1 1008.5,1060.4 947.2,1398.7 1060.7,1468.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1232/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68006544073053,39.28188716759874]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67955360268924,39.28447403067919]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67486979069838,39.283910937168734]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67538162873967,39.28132407408828]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1233/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1233","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1233/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1233","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1748.4 -0.0,-0.0 1423.0,0.0 1423.0,212.0 1319.8,211.6 1320.0,1502.0 1124.5,1503.0 1124.6,2038.0 945.0,2038.0 790.5,1766.9 462.4,1953.9 329.1,1954.6 204.2,1635.1 -0.0,1748.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1233/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1320.0,1096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6765374,39.285564]}},{"type":"Feature","properties":{"resourceCoords":[1320.0,1502.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6758173,39.2850882]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1234/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1234","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1234/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1234","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 -0.0,1491.0 194.0,1490.0 194.0,209.5 1328.6,213.4 1337.5,1012.2 1257.2,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1234/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[194.0,1490.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6758173,39.2850882]}},{"type":"Feature","properties":{"resourceCoords":[194.0,210.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6781062,39.2866002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1235/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1235","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1235/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1235","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"341.2,1940.5 393.9,848.7 358.0,0.0 1268.7,0.0 1243.9,820.8 1423.0,855.2 1423.0,1372.2 1309.9,1483.2 1423.0,1475.2 1423.0,2026.1 797.9,1984.3 743.0,2038.0 401.3,2038.0 341.2,1940.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1235/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6770142333047,39.28773482086983]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67479167780468,39.289659048004]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6712559994189,39.28717800235653]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67347855491893,39.28525377522236]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1236/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1236","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1236/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1236","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"203.0,1369.4 285.5,548.5 -0.0,528.5 0.0,-0.0 897.6,0.0 860.7,377.3 1435.0,993.5 1435.0,2038.0 222.8,2038.0 343.9,1934.8 380.2,1416.5 203.0,1369.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1236/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67644515302963,39.289654360112216]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67439288195116,39.29170215308983]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67066151240934,39.289430421227536]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67271378348781,39.28738262824992]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1237/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1237","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1237/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1237","type":"ImageService3","width":1428,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"66.8,1935.2 71.0,864.8 0.0,881.1 28.4,597.1 1428.0,545.6 1428.0,1709.8 527.3,1932.6 67.2,1978.6 67.3,2038.0 0.0,2038.0 0.0,1939.8 66.8,1935.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1237/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[163.0,1940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6721953,39.281105]}},{"type":"Feature","properties":{"resourceCoords":[814.0,395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.675502,39.2828081]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1238/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1238","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1238/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1238","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"181.9,2038.0 168.5,1853.7 0.5,1865.5 209.5,1803.7 124.7,383.3 1398.2,1037.3 1374.0,1093.0 1293.2,1099.2 868.7,1287.1 1076.3,2038.0 181.9,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1238/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6763732422643,39.28389594917799]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67555413491061,39.286427877024444]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67094092134221,39.28552111536909]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6717600286959,39.28298918752264]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1239/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1239","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1239/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1239","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"103.2,206.1 515.8,170.3 1261.2,0.0 1429.0,0.0 1429.0,2038.0 60.2,2038.0 103.2,206.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1239/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6726696,39.2807988]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.672081,39.2833685]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6673462,39.2827186]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6679348,39.2801489]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1240/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1240","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1240/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1240","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,821.1 1435.0,2038.0 267.8,2038.0 240.6,398.2 1085.2,443.2 1185.4,880.5 1435.0,821.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1240/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[138.0,212.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6721562,39.2831857]}},{"type":"Feature","properties":{"resourceCoords":[486.0,131.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6721883,39.283869]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1241__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1241 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5728.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1241__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1241","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.5,1386.5 116.4,1466.5 175.8,1931.7 1432.0,1954.9 1432.0,234.7 485.1,1087.8 485.3,1165.2 261.4,1395.7 133.5,1386.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1241__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[486.0,1412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6722927,39.2858143]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,1412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6704184,39.2858743]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1242/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1242","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1242/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1242","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"386.7,207.8 -0.0,558.2 -0.0,-0.0 1432.0,0.0 1432.0,1869.5 390.8,1625.1 386.7,207.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1242/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[859.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6689788,39.2859203]}},{"type":"Feature","properties":{"resourceCoords":[859.0,653.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6690433,39.2872183]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1243 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5740.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1145.2,712.7 894.2,745.6 574.0,527.6 717.8,315.4 258.7,0.0 0.0,-0.0 -0.0,2029.1 503.1,1914.1 491.9,1868.2 1099.9,1741.6 961.8,1239.0 1426.3,1107.8 1259.6,994.3 1203.8,672.0 1145.2,712.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1262.0,585.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6767925,39.2909412]}},{"type":"Feature","properties":{"resourceCoords":[331.0,1244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.677637,39.2889614]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1243 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3022.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2717.2"},{"label":"split_canvas_h","value":"2542.4"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,71.0 1248.6,39.1 1255.1,-0.0 755.7,-0.0 1101.9,372.2 1274.3,508.5 1422.2,379.9 1435.0,71.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1243__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[755.7,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68341747398347,39.313216090384934]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68308829624013,39.31200403579981]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,635.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68455351945252,39.31176583387962]}},{"type":"Feature","properties":{"resourceCoords":[755.7,635.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68488269719586,39.312977888464744]}},{"type":"Feature","properties":{"resourceCoords":[1271.2,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6832668,39.3122803]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1244__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1244 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5780.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1244__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1244","type":"ImageService3","width":1445,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1113.0,1919.9 1113.2,2038.0 1445.0,2038.0 1445.0,703.2 871.7,703.5 866.6,703.5 870.4,595.5 863.6,0.0 -0.0,-0.0 -0.0,200.2 78.3,199.9 83.5,1699.6 682.6,1692.2 1113.0,1919.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1244__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1118.0,930.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6836514,39.2781306]}},{"type":"Feature","properties":{"resourceCoords":[82.0,1277.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6845362,39.2799591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1245/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1245","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1245/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1245","type":"ImageService3","width":1436,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.0,2005.8 229.6,-0.0 1180.2,-0.0 1170.6,2038.0 -0.0,2038.0 -0.0,2006.0 229.0,2005.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1245/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[700.0,1121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.684671,39.282562]}},{"type":"Feature","properties":{"resourceCoords":[229.0,271.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6827214,39.283478]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1246/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1246","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1246/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1246","type":"ImageService3","width":1445,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1214.0,1708.0 258.4,1705.2 258.3,238.4 472.4,239.0 468.6,-0.0 1445.0,-0.0 1445.0,45.5 1131.9,45.6 1132.0,240.9 1208.5,241.2 1214.0,1708.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1246/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[996.0,242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6820703,39.2804213]}},{"type":"Feature","properties":{"resourceCoords":[1214.0,1708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6855114,39.27993]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1247 [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":"5716.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1063.6,355.2 945.5,353.3 945.0,0.0 506.1,0.0 516.8,157.9 120.7,185.1 109.8,0.0 -0.0,-0.0 -0.0,2038.0 113.8,2038.0 97.0,1747.4 128.7,1745.5 142.0,1972.5 1153.0,1914.4 1063.6,355.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[142.0,1972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6867908,39.2833526]}},{"type":"Feature","properties":{"resourceCoords":[142.0,548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6867314,39.2859588]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1247 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"split_canvas_x","value":"3780.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1936.0"},{"label":"split_canvas_h","value":"1444.4"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1029.6,354.6 1429.0,361.1 1429.0,0.0 945.0,0.0 945.2,170.0 1031.2,175.8 1029.6,354.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1247__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[945.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68700808167327,39.28727604366894]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68587203537906,39.28732092986317]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,361.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68582908464894,39.28666044640764]}},{"type":"Feature","properties":{"resourceCoords":[945.0,361.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68696513094314,39.2866155602134]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1248/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1248","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1248/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1248","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"983.0,1827.0 -0.0,1827.1 0.0,-0.0 1440.0,0.0 1440.0,1486.7 1193.3,1416.1 979.9,1278.7 983.0,1827.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1248/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[707.0,1827.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6827214,39.283478]}},{"type":"Feature","properties":{"resourceCoords":[983.0,1827.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6820668,39.2834981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1249__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1249 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5708.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1249__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1249","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1427.0,1982.5 1427.0,1264.4 1352.1,1261.9 1373.2,504.3 581.9,313.7 574.3,346.7 525.5,335.4 530.9,301.8 -0.0,177.3 0.0,1603.1 0.0,1684.4 -0.0,2038.0 906.0,2038.0 1150.0,2038.0 1244.0,2038.0 1427.0,1982.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1249__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[637.0,1245.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6715904,39.2775538]}},{"type":"Feature","properties":{"resourceCoords":[542.0,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.672199,39.2809259]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1256/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1256","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1256/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1256","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"166.6,1960.9 149.1,1262.1 74.3,1260.4 87.3,509.8 170.1,529.0 279.5,0.0 1444.0,0.0 1444.0,1465.2 1303.3,1521.2 1302.5,1549.4 1444.0,1904.5 1444.0,2038.0 420.0,2038.0 301.3,1916.3 166.6,1960.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1256/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66877013922493,39.28216228635457]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66203979646686,39.282306104623586]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66177941339951,39.27490131927378]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66850975615759,39.274757501004764]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1257__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1257 [1]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"11"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5732.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1257__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1257","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"985.0,2038.0 1069.3,2038.0 1063.0,1860.8 1063.0,1860.7 1102.2,1858.9 1061.6,1832.8 1058.5,1769.7 1058.4,1767.9 1058.2,1763.1 1045.0,1758.2 1057.7,1753.2 1056.5,1730.1 1212.4,1691.7 1433.0,1649.7 1433.0,1624.0 1433.0,1420.3 1295.0,1419.2 1303.5,807.2 1433.0,0.0 1292.0,0.0 1138.0,0.0 42.5,0.0 -0.0,93.2 -0.0,2038.0 985.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1257__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1318.0,976.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6583352,39.2774159]}},{"type":"Feature","properties":{"resourceCoords":[1318.0,788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6586869,39.2780434]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1264/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1264","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1264/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1264","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"163.5,1939.5 135.5,1858.0 60.4,1856.2 55.9,2038.0 -0.0,2038.0 -0.0,1744.1 172.5,1303.0 195.4,940.5 352.7,875.8 705.4,-0.0 1444.0,-0.0 1444.0,1908.6 1013.2,1947.3 163.5,1939.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1264/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66346492559897,39.277243341981944]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66078117478811,39.272432259692614]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66949100681211,39.269479356785745]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67217475762297,39.274290439075074]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1266/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1266","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1266/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1266","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"524.4,2038.0 342.6,2038.0 325.5,2014.0 369.3,1958.0 390.8,1660.6 -0.0,1866.9 -0.0,0.0 75.0,-0.0 104.9,80.5 1071.1,64.2 1444.0,-0.0 1444.0,1858.0 1365.5,1677.8 524.4,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1266/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67128544292534,39.274352856365326]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66874717045647,39.26947978621602]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6775688540663,39.26668683469381]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68010712653516,39.271559904843116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1267__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1267 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"22"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5732.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1267__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1267","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1113.0,2038.0 1208.7,2038.0 1280.0,2038.0 1433.0,2038.0 1433.0,1023.3 1433.0,422.7 1110.4,395.0 950.7,310.0 946.8,281.0 1024.9,234.9 1163.7,-0.0 222.9,0.0 233.6,252.8 236.9,316.4 247.7,521.2 231.6,665.2 0.0,807.2 -0.0,2038.0 1113.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1267__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[413.0,927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.683326,39.2699417]}},{"type":"Feature","properties":{"resourceCoords":[572.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.684182,39.2682447]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1268/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1268","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1268/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1268","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"597.5,342.2 600.9,544.9 827.8,-0.0 1444.0,-0.0 1444.0,2038.0 138.6,2019.5 -0.0,348.5 597.5,342.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1268/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67695012448264,39.2697956404894]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67234924127295,39.26617082723004]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67891074350206,39.26110794833514]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68351162671175,39.264732761594495]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1269__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1269 [2]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"20"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5708.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1269__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1269","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1427.0,2038.0 1427.0,-0.0 0.0,0.0 0.0,1027.5 231.7,1030.2 622.6,1235.8 624.3,2038.0 1427.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1269__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[925.0,1215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6624464,39.2650323]}},{"type":"Feature","properties":{"resourceCoords":[1022.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6627817,39.2642556]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1277__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1277 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5692.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1277__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1277","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.0,1644.2 1423.0,1402.7 1337.4,1350.8 1205.5,1533.2 1203.9,1064.2 1423.0,763.5 1423.0,688.8 1323.5,595.2 1273.1,398.0 1423.0,373.0 1423.0,30.5 1288.5,127.0 1233.7,130.4 1080.3,95.3 1022.1,146.9 948.2,179.3 218.3,355.1 301.5,475.9 223.6,490.0 142.4,372.7 79.7,387.4 84.7,515.2 -0.0,530.5 0.0,1807.2 217.0,1802.2 226.5,2038.0 387.0,2038.0 558.0,2038.0 1423.0,2038.0 1423.0,2001.0 1206.7,1861.1 1206.5,1835.5 1280.5,1875.0 1423.0,1644.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1277__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1272.0,1886.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7106755,39.2878881]}},{"type":"Feature","properties":{"resourceCoords":[218.0,355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7034865,39.2917321]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1278/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1278","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1278/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1278","type":"ImageService3","width":1444,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.0,2038.0 267.6,2038.0 -0.0,1858.8 -0.0,1833.1 22.4,1833.3 73.4,1872.9 81.0,1860.7 215.8,1642.3 216.7,1400.5 131.8,1348.2 -0.0,1530.5 -0.0,1060.7 255.2,710.5 120.5,591.5 71.1,393.9 140.9,384.5 221.2,369.1 221.4,26.3 220.0,26.7 193.3,39.7 112.9,112.4 58.6,128.2 -0.0,118.0 -0.0,0.0 1444.0,-0.0 1444.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1278/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70183096956215,39.288161766741865]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.7017945709749,39.282877341882134]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.71136297621092,39.282837299798594]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.71139937479818,39.288121724658325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1279/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1279","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1279/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1279","type":"ImageService3","width":1431,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,327.3 -0.0,247.6 131.7,188.5 128.3,123.6 -0.0,105.3 0.0,0.0 608.4,0.0 600.2,145.5 782.9,167.5 1370.5,162.2 1373.3,188.8 1431.0,192.0 1431.0,233.6 1381.2,263.3 1431.0,742.1 1389.8,884.5 1356.4,1206.4 1377.8,1265.6 1431.0,1303.2 1431.0,2038.0 175.4,2038.0 307.1,1303.5 189.4,1282.4 238.7,1168.2 197.7,1101.1 178.8,1022.0 135.5,266.9 -0.0,327.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1279/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70432895151816,39.29259133609817]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69780581626067,39.293530884919996]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69608904188813,39.286290000651434]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70261217714562,39.28535045182961]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1280/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1280","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1280/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1280","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.5,877.5 254.1,814.4 453.7,549.5 573.5,437.1 774.9,0.0 978.4,0.0 1210.1,142.6 1432.0,316.7 1432.0,2038.0 -0.0,2038.0 -0.0,1382.5 273.5,945.9 241.5,877.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1280/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.7004548,39.2907522]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6955695,39.2940977]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6894177,39.2887166]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.694303,39.2853711]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1288/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1288","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1288/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1288","type":"ImageService3","width":1454,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 -0.0,1805.9 148.1,1806.2 149.4,1590.4 148.1,1477.3 -0.0,1478.2 -0.0,-0.0 1454.0,0.0 1454.0,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1288/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69618117012325,39.28467802539938]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69276372072707,39.28475949325241]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6926172284617,39.281025674651126]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69603467785788,39.2809442067981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1289/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1289","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"17"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1289/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1289","type":"ImageService3","width":1434,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 -0.0,972.6 167.6,973.7 167.0,1049.0 285.2,1049.5 289.8,313.6 -0.0,311.7 -0.0,199.4 1161.7,192.2 1161.8,-0.0 1434.0,-0.0 1434.0,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1289/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[531.0,1471.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6979482,39.2800049]}},{"type":"Feature","properties":{"resourceCoords":[168.0,369.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6928952,39.2814562]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1296/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p1296","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"11"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1296/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1296","type":"ImageService3","width":1454,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1422.7,1028.6 1418.4,1822.2 1302.6,2038.0 -0.0,2029.5 0.0,-0.0 1139.8,0.0 1104.9,574.2 1163.4,577.8 1162.0,1027.0 1422.7,1028.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-1296/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1180.0,545.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6867908,39.2833526]}},{"type":"Feature","properties":{"resourceCoords":[781.0,1024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6885242,39.2815931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0801/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p801","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0801/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0801","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.8,635.1 -0.0,554.6 -0.0,76.3 1432.0,67.8 1432.0,1050.0 1026.7,1051.3 1024.5,1558.8 1432.0,1987.6 1432.0,2038.0 64.2,2037.3 65.8,635.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0801/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[811.0,1599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6649579,39.2952285]}},{"type":"Feature","properties":{"resourceCoords":[811.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6651146,39.2980382]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0802/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p802","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0802/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0802","type":"ImageService3","width":1439,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1547.6 -0.0,1041.2 407.4,1038.4 403.1,58.1 233.3,59.8 233.4,0.0 1270.5,0.0 1270.6,49.6 1439.0,47.9 1439.0,1031.2 1273.0,1032.4 1280.7,2020.6 462.6,2027.1 -0.0,1547.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0802/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66459783449909,39.29817243363421]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66119404172277,39.29827618822791]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66100549322742,39.29451924920052]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66440928600375,39.29441549460682]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0803/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p803","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0803/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0803","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"354.4,1030.2 367.6,53.8 559.4,53.5 560.6,0.0 1043.1,0.0 1043.0,8.7 1110.3,9.9 1085.9,2014.4 183.8,2010.5 189.5,1029.1 354.4,1030.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0803/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66207151023987,39.29825160872048]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65866288217933,39.29839171344858]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65840703131738,39.29461105150651]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66181565937792,39.294470946778404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0804/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p804","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0804/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0804","type":"ImageService3","width":1439,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2018.0 -0.0,13.9 1439.0,0.0 1439.0,2038.0 -0.0,2018.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0804/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65942880502364,39.29836761102073]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65600071218489,39.29847593574355]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65580385810634,39.29469218503293]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65923195094508,39.29458386031011]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0805/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p805","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0805/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0805","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,480.1 43.0,480.2 37.2,109.5 1239.2,93.2 1262.3,1919.0 89.6,1936.2 90.5,2038.0 -0.0,2038.0 -0.0,480.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0805/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66740407427109,39.30147310311426]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66406246972834,39.30156190738766]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66390063227142,39.29786350271059]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66724223681418,39.297774698437195]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0806/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p806","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"17"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0806/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0806","type":"ImageService3","width":1439,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1370.1,96.1 1370.5,0.0 1439.0,0.0 1439.0,1292.4 1170.8,1291.7 1167.5,1877.7 117.0,1870.2 116.5,1931.2 -0.0,1931.5 -0.0,98.2 1370.1,96.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0806/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[616.0,1620.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6629081,39.2986841]}},{"type":"Feature","properties":{"resourceCoords":[413.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.663547,39.3014157]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0807/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p807","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"26"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0807/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0807","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,1907.7 80.5,1916.8 81.4,2038.0 -0.0,2038.0 -0.0,733.4 172.5,733.4 167.9,143.1 1435.0,136.8 1435.0,723.2 1435.0,1907.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0807/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[578.0,732.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6662474,39.3034821]}},{"type":"Feature","properties":{"resourceCoords":[926.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6653681,39.302429]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0808/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p808","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0808/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0808","type":"ImageService3","width":1443,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"254.4,1917.2 255.6,137.0 488.0,136.0 486.7,0.0 1443.0,0.0 1443.0,1910.3 254.4,1917.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0808/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[114.0,1918.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6644375,39.3013838]}},{"type":"Feature","properties":{"resourceCoords":[488.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6637342,39.3046555]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0809/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p809","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0809/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0809","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"605.5,121.2 1329.8,119.2 1331.8,416.4 1244.3,416.3 1243.5,1073.3 1284.8,1073.4 1285.6,1197.5 1264.2,1197.3 1257.3,1975.2 1302.5,1975.7 1302.6,2038.0 -0.0,2038.0 -0.0,150.0 605.4,144.7 605.5,121.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0809/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67349816108751,39.30475413316322]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66680897786715,39.30497767461727]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66640158585336,39.29757441108325]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67309076907372,39.2973508696292]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0816/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p816","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0816/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0816","type":"ImageService3","width":1443,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1054.9,61.1 1057.8,106.2 1095.3,106.6 1168.2,998.7 1301.0,999.4 1308.4,1661.2 1443.0,1659.7 1443.0,2038.0 -0.0,2038.0 -0.0,-0.0 1088.1,37.1 1090.6,61.3 1054.9,61.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0816/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68513690048304,39.31412529316954]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6785438168952,39.314396545096294]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67805215013857,39.30714106315254]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68464523372641,39.30686981122579]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0817/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p817","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0817/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0817","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1435.0,0.0 1435.0,54.4 1363.3,54.0 1354.1,2038.0 -0.0,2038.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0817/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67408787463087,39.30793763875651]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67070533183082,39.308074033566726]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67045674211741,39.30433066533891]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67383928491746,39.3041942705287]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0818/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p818","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0818/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0818","type":"ImageService3","width":1443,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"427.0,1997.3 424.8,32.7 1117.4,32.8 1117.0,1997.4 427.0,1997.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0818/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1116.0,547.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.669194,39.3070936]}},{"type":"Feature","properties":{"resourceCoords":[1116.0,1619.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6690788,39.3051509]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0819/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p819","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"17"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0819/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0819","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"147.8,30.0 1435.0,40.2 1435.0,551.5 1270.3,550.5 1262.7,1241.4 1435.0,1242.2 1435.0,2000.2 132.1,1990.6 147.8,30.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0819/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[894.0,548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6674294,39.3071582]}},{"type":"Feature","properties":{"resourceCoords":[134.0,1613.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6690788,39.3051509]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0820/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p820","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0820/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0820","type":"ImageService3","width":1434,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"162.0,1242.0 164.5,557.0 327.8,556.8 311.1,0.0 1424.2,0.0 1434.0,1858.6 1287.2,1858.0 1286.8,1993.1 338.4,1993.1 332.9,1241.6 162.0,1242.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0820/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[540.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6655839,39.3059677]}},{"type":"Feature","properties":{"resourceCoords":[162.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6664785,39.3059356]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0821/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p821","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0821/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0821","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1098.5,0.0 1097.1,1240.8 903.5,1240.4 905.9,1862.2 490.6,1859.6 479.5,0.0 1098.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0821/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66475670376836,39.30825780442731]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6614028842741,39.30838387582878]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66117310858523,39.30467231360482]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6645269280795,39.30454624220335]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0822/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p822","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0822/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0822","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 -0.0,270.1 1085.0,277.4 1083.4,535.5 1150.0,617.6 1139.7,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0822/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66957791883262,39.29795968477393]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6662240323486,39.2980893998817]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66598847123092,39.294390107236374]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66934235771494,39.294260392128606]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0823/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p823","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0823/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0823","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"194.0,1265.1 200.1,60.7 707.8,63.4 702.0,0.0 956.1,0.0 948.4,1269.8 1435.0,1272.8 1435.0,2038.0 396.1,2038.0 397.6,1891.2 -0.0,1887.1 -0.0,1264.0 194.0,1265.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0823/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66265921847223,39.30837496769717]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65931291904857,39.30851110171088]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.65906480307723,39.304807866610744]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66241110250088,39.304671732597036]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0824/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p824","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0824/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0824","type":"ImageService3","width":1434,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1434.0,1738.5 471.7,1738.4 468.8,1263.5 -0.0,1263.8 -0.0,-0.0 1434.0,0.0 1434.0,92.0 1366.0,92.0 1366.0,236.8 1434.0,236.3 1434.0,1738.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0824/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1366.0,92.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6571157,39.3084704]}},{"type":"Feature","properties":{"resourceCoords":[1366.0,1263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6569858,39.3062763]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0825/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p825","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"19"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0825/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0825","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1376.2,2038.0 1369.3,1616.8 1261.7,1618.5 1261.6,1773.1 1222.3,1803.4 198.7,1793.7 190.8,985.6 118.1,986.3 105.8,348.1 211.3,350.8 211.5,302.8 414.7,303.0 685.7,139.3 685.9,299.1 1287.1,298.6 1287.0,344.8 1433.0,368.1 1433.0,2038.0 1376.2,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0825/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[685.0,1042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6741554,39.3099313]}},{"type":"Feature","properties":{"resourceCoords":[685.0,1790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.675932,39.3098653]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0826__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p826 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"25"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5736.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0826__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0826","type":"ImageService3","width":1434,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1775.8 -0.0,1819.2 761.5,1814.1 761.8,1869.0 1326.9,1868.8 1327.0,1840.6 1329.2,1457.9 1319.7,1506.7 1317.9,1429.2 1294.7,1429.7 1252.8,1430.6 1071.7,1434.6 1071.3,1434.6 1048.4,1435.1 1036.0,1259.3 1056.2,1258.4 1278.1,1248.2 1330.4,1251.4 1377.8,1253.0 1376.2,146.5 91.5,144.9 90.4,456.2 256.2,729.2 95.0,729.8 97.2,1336.2 50.5,1336.1 27.4,1483.5 -0.0,1483.6 0.0,1775.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0826__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[690.0,1334.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.670925,39.3089432]}},{"type":"Feature","properties":{"resourceCoords":[690.0,1869.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6708678,39.3079681]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0827/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p827","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0827/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0827","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.5,1860.8 155.0,135.6 1429.0,132.3 1429.0,1860.3 157.5,1860.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0827/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[907.0,1007.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6675749,39.3096409]}},{"type":"Feature","properties":{"resourceCoords":[907.0,134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.667668,39.3112284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0828/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p828","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0828/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0828","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1310.3,1818.8 193.4,1813.9 202.5,135.4 1183.0,138.0 1178.3,1254.4 1200.4,1300.2 1076.2,1301.1 1075.5,1348.5 1233.9,1348.3 1310.3,1818.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0828/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[430.0,1012.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6658019,39.3097037]}},{"type":"Feature","properties":{"resourceCoords":[1183.0,138.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6641371,39.3113614]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0829/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p829","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0829/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0829","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"102.7,1278.8 90.0,148.0 355.4,144.7 353.9,0.0 1311.6,0.0 1380.0,1883.2 251.2,1858.0 160.4,1373.1 -0.0,1375.8 -0.0,1327.8 125.8,1324.9 102.7,1278.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0829/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1320.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6612077,39.3098016]}},{"type":"Feature","properties":{"resourceCoords":[90.0,148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6641371,39.3113614]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0830__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p830 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5760.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0830__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0830","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"126.3,1347.7 137.9,1799.8 389.5,1798.4 389.5,1765.5 1034.6,1766.2 1033.2,1432.4 1033.2,1413.4 1268.9,1419.0 1304.2,1419.8 1304.2,1420.9 1316.2,1766.4 1440.0,1766.5 1440.0,1657.0 1440.0,1421.9 1440.0,0.0 172.6,0.0 97.8,0.0 90.8,1258.3 126.3,1347.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0830__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[96.0,819.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.661229,39.3102262]}},{"type":"Feature","properties":{"resourceCoords":[144.0,1863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6610009,39.3083269]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0831/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p831","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0831/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0831","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.1,1785.8 226.7,0.0 1254.5,0.0 1249.9,1315.9 1112.2,1315.1 1130.8,1473.3 1429.0,1477.6 1429.0,2038.0 576.9,2038.0 578.0,1885.3 649.7,1885.8 650.4,1788.8 216.1,1785.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0831/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1252.0,716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6557104,39.3106102]}},{"type":"Feature","properties":{"resourceCoords":[1113.0,1889.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6558874,39.3085139]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0832/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p832","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0832/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0832","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1440.0,2038.0 -0.0,2038.0 -0.0,1883.2 114.3,1882.3 106.6,917.5 104.8,818.1 100.5,594.1 -0.0,595.5 0.0,0.0 1440.0,0.0 1440.0,702.4 1362.2,703.2 1364.4,998.3 1440.0,997.5 1440.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0832/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[765.0,710.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6542219,39.311718]}},{"type":"Feature","properties":{"resourceCoords":[108.0,1295.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6557104,39.3106102]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0833/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p833","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0833/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0833","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"74.1,138.6 -0.0,132.9 -0.0,43.1 70.7,48.2 69.0,0.0 1429.0,0.0 1429.0,146.9 1147.2,125.3 1127.2,450.7 1429.0,1577.7 797.8,1228.4 824.8,1310.6 773.0,1963.3 102.2,1916.0 74.1,138.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0833/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68031413060761,39.314182917627456]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67704503862274,39.31448619612411]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6764899194968,39.31085352174788]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67975901148168,39.31055024325123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0834/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p834","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0834/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0834","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1252.2,1905.4 1440.0,1927.9 1440.0,2038.0 -0.0,2038.0 -0.0,725.3 408.2,731.8 424.3,78.1 393.9,0.0 1041.4,311.6 1041.4,311.6 1039.2,272.6 1054.5,318.0 1289.0,431.6 1252.2,1905.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0834/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6790587461992,39.31211312920436]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67574353059072,39.31227872836309]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67544274310089,39.30862283507713]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67875795870937,39.308457235918404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0835/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p835","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0835/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0835","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"612.8,1636.1 379.6,1525.1 -0.0,423.3 -0.0,100.5 279.9,104.8 273.4,0.0 1389.6,0.0 1388.5,117.9 1034.3,113.4 1033.7,199.1 1387.8,201.4 1371.9,1964.8 1429.0,1964.2 1429.0,2038.0 603.2,2038.0 612.8,1636.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0835/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67766906580943,39.31438488573792]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67434954293931,39.314533298686435]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67407788818281,39.31084459264953]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67739741105292,39.31069617970102]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0836/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p836","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0836/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0836","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"356.2,1969.9 61.3,1844.8 -0.0,1813.8 -0.0,1776.2 -0.0,160.2 -0.0,84.0 358.7,0.0 1440.0,0.0 1440.0,177.1 1074.3,1955.6 916.4,2038.0 356.2,1969.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0836/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[357.0,1362.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6742871,39.3120486]}},{"type":"Feature","properties":{"resourceCoords":[1121.0,1362.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6725334,39.3121155]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0837/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p837","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0837/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0837","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.1,1605.0 55.4,160.9 370.6,160.9 367.5,67.7 54.4,68.9 52.2,0.0 1237.0,0.0 1238.1,160.7 1375.2,160.4 1379.0,1929.9 60.5,1929.5 59.3,2038.0 9.1,2023.7 56.1,1605.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0837/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67279613552599,39.314506545256954]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66951655652052,39.31461932637665]}},{"type":"Feature","properties":{"resourceCoords":[1429.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.66931012191408,39.31097501146844]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67258970091954,39.31086223034875]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0838__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p838 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"9"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5760.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0838__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0838","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"986.0,2023.0 985.8,2038.0 1440.0,2038.0 1440.0,577.4 777.3,580.3 776.6,0.0 0.0,-0.0 -0.0,1813.9 272.1,1813.5 276.1,1517.2 992.5,1526.7 987.9,1876.1 949.2,1876.0 948.4,2022.8 966.0,2022.9 986.0,2023.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0838__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[652.0,1876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6542219,39.311718]}},{"type":"Feature","properties":{"resourceCoords":[1247.0,1876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6514184,39.3118299]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0839/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p839","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0839/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0839","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,23.7 1427.0,0.0 1427.0,1947.5 127.8,1944.4 135.5,184.0 -0.0,183.6 -0.0,23.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0839/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[892.0,1354.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6677305,39.3122944]}},{"type":"Feature","properties":{"resourceCoords":[130.0,1354.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6694998,39.3122255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0840/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p840","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0840/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0840","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"187.3,1953.9 177.4,0.0 1440.0,0.0 1440.0,1950.4 187.3,1953.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0840/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[410.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.665966,39.3123594]}},{"type":"Feature","properties":{"resourceCoords":[1174.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6641987,39.3124213]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0841/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p841","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"20"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0841/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0841","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"328.3,1603.3 327.8,967.2 294.1,967.2 297.1,140.1 808.0,136.5 807.2,0.0 1427.0,0.0 1427.0,2038.0 1373.2,2038.0 1374.0,1887.7 1264.2,1889.3 1264.2,1897.8 375.4,1888.2 375.2,1904.3 194.8,1916.5 196.3,1603.1 328.3,1603.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0841/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[941.0,1602.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6581166,39.2994518]}},{"type":"Feature","properties":{"resourceCoords":[1266.0,1309.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6566362,39.3005817]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0848/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p848","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0848/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0848","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"956.0,2038.0 868.1,2038.0 73.0,1038.0 -0.0,1095.5 -0.0,-0.0 1430.0,0.0 1430.0,2038.0 1158.9,2038.0 1109.4,1973.7 956.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0848/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[731.0,1224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6837128,39.299982]}},{"type":"Feature","properties":{"resourceCoords":[1150.0,893.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.683819,39.3018961]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0849/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p849","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0849/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0849","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 -0.0,-0.0 1218.7,0.0 1177.7,570.6 1246.8,570.6 1173.0,987.0 1103.2,987.0 1094.6,1912.2 1128.3,1977.4 1427.0,1978.7 1427.0,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0849/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68675815317368,39.29723200797223]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68346528086634,39.2973611050506]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68322870882183,39.293695984249155]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68652158112917,39.29356688717078]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0850/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p850","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0850/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0850","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"479.8,1962.6 479.5,1905.3 191.1,1905.5 158.2,1842.7 162.1,949.1 229.4,948.8 298.8,546.3 232.0,546.6 268.8,0.0 1337.6,0.0 1326.7,1905.0 1228.8,1905.3 1228.7,1969.9 479.8,1962.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0850/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68458797008812,39.29731085569504]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68115140749717,39.297432240872894]}},{"type":"Feature","properties":{"resourceCoords":[1438.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68093066900103,39.293636448707986]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68436723159198,39.29351506353013]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0851/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p851","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0851/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0851","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1307.9,0.0 1308.0,247.8 1427.0,249.3 1427.0,2001.9 -0.0,2015.7 -0.0,1949.2 100.0,1948.6 105.6,0.0 1307.9,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0851/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1308.0,546.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6785243,39.2965054]}},{"type":"Feature","properties":{"resourceCoords":[105.0,138.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.681378,39.297152]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0852/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p852","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0852/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0852","type":"ImageService3","width":1436,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1257.6,407.1 1259.4,554.8 1436.0,715.8 1263.9,932.9 1267.8,1261.4 1349.1,1260.5 1368.1,2020.0 539.3,2038.0 253.8,2036.3 216.9,263.9 847.1,259.1 845.1,0.0 1436.0,0.0 1436.0,212.3 1257.6,407.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0852/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67878664443386,39.29751547712179]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67548762711627,39.29757106940349]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67538639163459,39.29392213697969]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67868540895218,39.29386654469799]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0853/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p853","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0853/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0853","type":"ImageService3","width":1435,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,437.5 181.3,244.2 183.8,31.1 -0.0,28.9 -0.0,-0.0 1223.9,0.0 1225.7,189.4 1435.0,187.5 1435.0,1962.8 90.5,1971.0 81.6,1294.8 -0.0,1294.7 -0.0,965.1 175.3,749.3 -0.0,585.6 -0.0,437.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0853/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67591072245794,39.29761559401431]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67262615159817,39.29770132813361]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67246991778366,39.29406584740051]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67575448864343,39.29398011328121]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0854/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p854","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0854/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0854","type":"ImageService3","width":1378,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1145.0,1960.5 -0.0,1974.1 -0.0,0.0 1378.0,-0.0 1378.0,744.2 1265.4,745.6 1129.7,747.6 1145.0,1960.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0854/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67692111302614,39.299575000808474]}},{"type":"Feature","properties":{"resourceCoords":[1378.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.67682762191174,39.29708438626303]}},{"type":"Feature","properties":{"resourceCoords":[1378.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68155418965904,39.296976630403954]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68164768077344,39.2994672449494]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0855/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p855","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0855/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0855","type":"ImageService3","width":1428,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1164.5,13.3 1161.1,2038.0 -0.0,2032.0 -0.0,7.3 1164.5,13.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0855/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.6814880955563,39.29954978562222]}},{"type":"Feature","properties":{"resourceCoords":[1428.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68133121868863,39.29694405934616]}},{"type":"Feature","properties":{"resourceCoords":[1428.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68610308595021,39.296769577080596]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.68625996281789,39.299375303356655]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0868/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p868","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0868/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0868","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 1427.0,0.0 1427.0,1337.9 1176.6,1316.3 1047.3,1256.0 1002.4,1957.3 1427.0,1965.1 1427.0,2002.9 1146.8,1988.0 945.0,2001.1 890.5,2038.0 769.6,2038.0 765.6,2012.8 376.8,2038.0 -0.0,2038.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0868/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70267205084724,39.29981589400181]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69607079827689,39.300471775336156]}},{"type":"Feature","properties":{"resourceCoords":[1427.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.69486886971032,39.29312438052953]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70147012228067,39.29246849919518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p869 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1268.4"},{"label":"split_canvas_w","value":"5760.0"},{"label":"split_canvas_h","value":"6883.6"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1929.4 -0.0,1954.0 667.7,2038.0 1440.0,2038.0 1440.0,517.3 350.8,517.3 376.1,915.5 -0.0,1218.7 0.0,1929.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[104.0,1483.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6965445,39.2948754]}},{"type":"Feature","properties":{"resourceCoords":[665.0,1936.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6939072,39.2934267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p869 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5760.0"},{"label":"split_canvas_h","value":"2069.2"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1440.0,201.2 1257.8,-0.0 106.2,-0.0 99.9,317.9 316.4,319.7 311.9,517.3 1440.0,517.3 1440.0,201.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0869__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[634.0,277.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6896681,39.2954741]}},{"type":"Feature","properties":{"resourceCoords":[1164.0,508.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6884388,39.2936191]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p890 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"14"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5760.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 1440.0,2038.0 1440.0,1520.0 1193.9,1523.6 1190.8,1372.5 820.8,1370.0 817.8,1126.7 942.8,620.8 954.4,521.4 965.8,423.7 960.1,0.0 0.0,0.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[537.0,1405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7040705,39.315639]}},{"type":"Feature","properties":{"resourceCoords":[303.0,1824.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7045476,39.3148338]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p890 [2]","metadata":[{"label":"streets","value":"1"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3817.6"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1942.4"},{"label":"split_canvas_h","value":"2103.6"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"960.1,0.0 965.8,423.7 954.4,521.4 967.3,521.5 1440.0,525.9 1440.0,0.0 960.1,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0890__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[954.4,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70562880280862,39.313395838492674]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70456068696684,39.31307862755383]}},{"type":"Feature","properties":{"resourceCoords":[1440.0,525.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70500442948,39.31218422213293]}},{"type":"Feature","properties":{"resourceCoords":[954.4,525.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.70607254532177,39.31250143307177]}},{"type":"Feature","properties":{"resourceCoords":[782.5,652.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7065591,39.3123973]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0891/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_031 p891","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-21T08:01:57Z","modified":"2026-09-21T08:01:57Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0891/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0891","type":"ImageService3","width":1409,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2038.0 0.0,0.0 1335.3,0.0 1318.8,40.1 1409.0,77.3 1409.0,2038.0 -0.0,2038.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195008:03573_08_1950-0891/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[928.0,777.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7078478,39.3097461]}},{"type":"Feature","properties":{"resourceCoords":[588.0,1466.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.7093882,39.3071734]}}]}}]}