MassGIS 2003 Massachusetts Elevation Contours (1:5,000) (September 2002)
- The Elevation Contours (1:5,000) datalayer represents 3-meter contours created from Digital Terrain Model (DTM) data points collected during the production of the 1:5,000 Black and White Digital Orthophoto images. This datalayer had previously been a mix of data from the DTMs as well as some 1:25,000 Digital Line Graph (DLG) data obtained from the U.S. Geological Society. As of August, 2001, all older USGS data have been replaced by the 1:5,000 product.
- Office of Geographic and Environmental Information (MassGIS)
- Altitudes, Contours (Cartography), Altitudes -- Measurement, and elevation
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