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MassGIS' Level 3 Assessors’ Parcel Mapping data set was developed through a competitive procurement funded by MassGIS. Each community in the Commonwealth was bid on by one or more vendors and the unit of work awarded was a city or town. The specification for this work was Level 3 of the MassGIS Digital Parcel Standard. Standardization of assessor parcel mapping is complete for 350 of Massachusetts' 351 cities and towns. (Boston, which is not part of this project, is being processed separately). MassGIS is now incorporating updates from municipalities into the database.
The political boundary datalayer is a 1:25,000 scale datalayer containing the boundaries of the 351 communities (cities and towns) in Massachusetts. The seaward boundary of coastal communities has been defined at mean high water in this datalayer. The datalayer is named TOWNS_POLY. Note that the 351 communities are the official municipal names, not including "villages" or other sections of towns. This layer includes single-part features, where offshore islands are separate features from the mainland, although the attributes are the same for all features in one municipality.
This datalayer, except the coastline, was digitized by MassGIS from a set of stable based film prints of the 1:25,000 7.5' quadrangles purchased from the USGS by the Massachusetts Dept. of Public Works. The coastline was taken from the USGS 1:100,000 hydrography DLG database. It was selected visually and appended to the digitized town boundaries.