Basemap PNG

GIS File Name



PNG, 8 Bit


The City of Cambridge, Massachusetts, Geographic Information System (GIS) City-Wide 3D project provides a detailed three-dimensional model including the terrain, groundplan and buildings of the city. The city-wide model has been cut into one-kilometer squares for exchange with 3D design tools. Each file associated with the tiled 3D model is named with the prefix CAMB3D_ then the tile name, e.g. G5_, then the name of the dataset.

The 2010 Basemap layer provides a clear reference map showing the edge of paved and planted areas as well as labeled 1-foot contours, street names, pavement markings and parcel boundaries. In all, 24 layers from the Cambridge GIS were graphically ordered and styled and then clipped to each tile boundary. The original layers were developed from stereo photogrammetric methods, with a precision of about six inches. The cell size of the basemap layer is approximately 12 centimeters.


This basemap is useful as a visual reference for the ground conditions as it relates to terrain and buildings. It can be used as a setting and a initial condition for detailed design studies.

Download Layer Data

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These tiled terrain layers were made with the following city-wide layers available for download from the City of Cambridge GIS. Except for the parcel boundaries, these data sets data were developed photogrammetrically by Infotec USA using aerial photography from April 2010.

3D Basemap Sources:
ASSESSING_ParcelsFY2016 BASEMAP_Buildings BASEMAP_Cemeteries
BASEMAP_Driveways BASEMAP_Roads BASEMAP_Driveways
BASEMAP_ParkingLots BASEMAP_Plazas BASEMAP_Sidewalks
BASEMAP_Stairs BASEMAP_PrivateWalkways BASEMAP_PublicFootpaths
BASEMAP_ImperviousOther BASEMAP_SwimmingPools BASEMAP_Vegetation
HYDRO_WaterBodies HYDRO_Wetlands TRANS_Rail
TRANS_Centerlines TRAFFIC_PavementMarkings ELEVATION_Contours (1 Foot)

Background in areas beyond the city limits is covered with roads, openspace and 2003 building data from massGIS.

Coordinate System

Universal Transverse Mercator Projection, Zone 19, WGS84.

Usage Notes

These images have extents that align precisely with the tile boundary included with all of the other data Camb3D files for easy registration. In SketchUp, groundplan images may be easily applied the terrain. From the Materials Window, use the eye dropper to select the terrain material, then choose the desired ground plan image in the Edit tab.

3D Swap Materials