GIS File Name
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 terrain layer was developed from stereo photogrammetric methods, capturing critical elevation points and grade-breaklines with a precision of about one foot. Delaunay triangulation was used to create a surface mesh. This terrain model has the CAMB3D_Basemap_2010 draped on it for reference. COLLADA is the leading open exchange format. It can be imported by most 3D modeling tools.
This terrain model is useful as a visual reference for the terrain surface as it relates to buildings, roads and sidewalks. It can be used as a setting and a initial condition for detailed design studies.
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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:
The original DTM data were developed using aerial photography from April 2010 by Infotec USA.
Universal Transverse Mercator Zone 19, WGS84. The origin of each dataset has been shifted to tile center.
The tile frame included with each data set can be used to register models with neighboring tiles or with the city-wide tile grid.