- MassGIS has produced a statewide digital datalayer of the 32 major watersheds covering Massachusetts as defined by the USGS Water Resources Division and the MA Water Resources Commission. Unlike the MAJBAS layer, the watersheds in this layer extend beyond the state boundary to include the full extent of either the full watershed or a full USGS sub-basin. This layer is used as the index coverage for the WATRSHED and WATRSHD2 libraries. In ArcSDE are two layers, named WATERSHEDS_POLY and WATERSHEDS_ARC.
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