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MassGIS Data: Offshore Bathymetry (1:250,000)

December 1999

This datalayer represents bathymetry data - seafloor topography - for ocean waters off the coast of Massachusetts.

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Overview

sample of offshore bathymetry

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This datalayer represents bathymetry data - seafloor topography - for ocean waters off the coast of Massachusetts.  The layer was created by EOEEA 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.

Attributes

The datalayer's polygon attribute table has the following items:

DEPTH_NOSCode number for depth range (see table below)
DEPTHRANGEText field indicating depth below sea level, in meters
DEPTH_NOSDEPTHRANGE
1  Above-15m
2-15m to-25m
3-25m to-40m
4-40m to-90m
5-90m to-200m
6Below -200m

Maintenance

The layer is being maintained by MassGIS.

For more detailed offshore bathymetry see the Bathymetry of the Gulf of Maine datalayer.

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