OVERVIEW

The Major Ponds and Major Streams datalayers represent a subset of hydrographic features from the Hydrography (1:100,000) layer. Large water bodies and rivers are included in these two layers, respectively, and are meant to be used for plotting small-scale maps. The layers are named MAJPOND_POLY and MAJSTRM_ARC.

The data were taken from the more detailed 1:100,000 hydrography layer, which was developed from the US Geological Survey’s National Marine Division 1:100,000 digital line graphs (DLGs). The determination of which features should be considered “major” was made by M. Frimpter, Chief Hydrologist for the USGS.

The polygon attribute table has the following items:
 

		TYPE		Hydrographic feature type (character item, 2-2-C): P = Pond DS = Doubleline River I = Island
		FEATURE		Hydrographic feature type (numeric item, 2-2-B): 1 = Pond 2 = Doubleline River 3 = Island
		PRIMARY		Place-holder; codes have no meaning

The attribute table has the following item:
 

PRIMARY

All arcs are streams coded as 1

MassGIS is maintaining these layers. For more detailed hydrography, see these layers:

• DEP Wetlands (1:12,000)
• Hydrography (1:25,000)
• Hydrography (1:100,000)

Last Updated 5/30/2007
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