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City of Cambridge, MA, GIS basemap development project encompasses the land area of City of Cambridge with a 200-foot fringe surrounding the area and Charles River shoreline towards Boston. The basemap data was developed at 1" = 40' mapping scale using digital photogrammetric techniques. Planimetric features; both man-made and natural features like vegetation, rivers have been depicted. These features are important to all GIS/mapping applications and publication. A set of data layers such as Buildings, Roads, Rivers, Utility structures, 1 ft interval contours are developed and represented in the geodatabase. The features are labeled and coded in order to represent specific feature class for thematic representation and topology between the features is maintained for an accurate representation at the 1:40 mapping scale for both publication and analysis. The basemap data has been developed using procedures designed to produce data to the National Standard for Spatial Data Accuracy (NSSDA) and is intended for use at 1" = 40 ' mapping scale. Where applicable, the vertical datum is NAVD1988.

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NameSocrata field nameColumn name in sgr mountData typeDescription
Roof Elevation - sea levelelev_slelev_slNumberElevation of roofline edge above sea level (NAVD88)
Top Elevation - sea leveltop_sltop_slNumberElevation of highest point above sea level (NAVD88)
Geometrythe_geomthe_geomMultiPolygonPolygon layer geometry. The latitude and longitude data for the underlying map shapes.
Top Elevation - ground leveltop_gltop_glNumberElevation of highest point above ground level (NAVD88)
TypetypetypeTextType of building (building, outbuilding, ruin)
Roof Elevation - ground levelelev_glelev_glNumberElevation of roofline edge above ground level (NAVD88)
Building IDbldgidbldgidTextUnique building ID in master address block
Base Elevationbase_elevbase_elevNumberElevation of structure (NAVD88)
  • buildings
Upstream Metadata