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.
 

Click on image at left to view at larger size

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 description for the Bathymetry for the Gulf of Maine datalayer.

Last Updated 1/14/2008
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