{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn00374_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Alameda, California | 1950 | key map | 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"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000L/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alameda, California | 1950 | sanborn00374_003 p0L","metadata":[{"label":"streets","value":"52"},{"label":"intersections","value":"116"}],"created":"2026-09-21T14:15:33Z","modified":"2026-09-21T14:15:33Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000L/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000L/info.json","type":"ImageService2","height":7796,"width":6496},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 6496.0,0.0 6496.0,2380.4 6450.2,2373.8 6473.0,2234.2 6463.4,2212.2 6039.2,2148.0 6014.8,2203.3 5994.6,2472.4 5954.2,2711.8 6496.0,2791.0 6496.0,3812.4 6383.6,3810.0 6381.1,4006.9 6228.8,4004.7 6227.1,3812.9 6083.8,3809.8 6078.4,4183.6 6078.9,4199.4 6225.7,4202.3 6220.1,4598.7 6371.8,4600.9 6347.0,6331.4 6496.0,6332.5 6496.0,6461.0 6463.9,6482.6 6344.1,6484.0 6340.1,6818.4 6376.8,7594.7 6496.0,7586.2 6496.0,7796.0 -0.0,7796.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000L/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2224.3,6883.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.2860078,37.7726015]}},{"type":"Feature","properties":{"resourceCoords":[6080.9,6325.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.2622786,37.7658982]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000R/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alameda, California | 1950 | sanborn00374_003 p0R","metadata":[{"label":"streets","value":"80"},{"label":"intersections","value":"253"}],"created":"2026-09-21T14:15:33Z","modified":"2026-09-21T14:15:33Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000R/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000R/info.json","type":"ImageService2","height":7796,"width":6648},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"591.1,6397.8 741.3,6385.7 750.2,6243.8 591.8,6244.4 590.9,4504.2 434.8,4503.6 434.6,4105.0 283.5,4103.7 282.6,3711.9 430.1,3713.5 434.7,3906.3 591.4,3906.9 591.0,3708.9 706.7,3710.1 691.1,2683.1 132.6,2609.4 170.5,2368.3 187.1,2097.5 211.4,2041.6 648.7,2101.5 658.9,2123.6 637.6,2264.2 684.8,2270.3 650.4,-0.0 6648.0,-0.0 6648.0,7796.0 -0.0,7796.0 -0.0,7723.4 767.4,7715.3 764.3,7506.9 641.7,7514.2 592.1,6734.1 591.1,6397.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd436m:g4364m:g4364am:g4364am_g003741950:00374_1950-0000R/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3996.6,6597.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.242965,37.7554744]}},{"type":"Feature","properties":{"resourceCoords":[2381.4,4780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.2461963,37.7672175]}}]}}]}