Large water bodies and rivers are included in these two layers, respectively, and are meant to be used for plotting small-scale maps.
(.Zip file with Shapefiles ArcGIS .lyr)
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.
ProductionThe 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.
AttributesThe polygon attribute table has the following items:
feature type (character item, 2-2-C):
P = Pond
DS = Doubleline River
feature type (numeric item, 2-2-B):
1 = Pond
2 = Doubleline River
|NAME||Name of feature (if known)|
|SQ_METERS||Area of polygon in square meters|
MassGIS is maintaining these layers. The NAME and SQ_METERS fields were added to the polygon layer in the February 2013 update, at which time the island polygons (TYPE = "I") inside water bodies were removed. Additionally, the PRIMARY field was removed from both layers.
For more detailed hydrography, see these layers:
Last Updated 2/5/2013
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