December 1999
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Overview

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.
Offshore Bathymetry
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Attributes

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

Maintenance

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