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This datalayer represents bathymetry data - seafloor topography - for ocean waters off the coast of Massachusetts. The layer was created by EOEA Coastal Zone Management analysts for graphic display purposes only and is general in nature; it should not be used for navigation. Polygons were delineated from a 1:250,000 USGS regional map. Ocean depth measurements are in meters. The dataset is stored in ArcSDE as BTHOS250_POLY.
The datalayer's polygon attribute table has the following items:
DEPTH_NOS Code number for depth range (see table below) DEPTHRANGE Text field indicating depth below sea level, in meters
DEPTH_NOS DEPTHRANGE 1 Above-15m 2 -15m to-25m 3 -25m to-40m 4 -40m to-90m 5 -90m to-200m 6 Below -200m
The layer is being maintained by MassGIS.
For more detailed offshore bathymetry see the Bathymetry of the Gulf of Maine datalayer and the 30-meter raster Bathymetry for Massachusetts and Adjacent Federal Waters.
Last Updated 9/30/2008