Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The political boundary datalayer is a polygon representation of town boundaries created from arcs developed from survey coordinates extracted from the 68-volume Harbor and Lands Commission Town Boundary Atlas for the 351 communities (cities and towns) in Massachusetts. The Atlas was published in the early 1900's and is maintained by the Survey Section of Massachusetts Highway Department. For communities with a coastal boundary, MassGIS has collaborated with Massachusetts Water Resources Authority and the Department of Environmental Protection to complete a 1:12000 scale coastline. The boundary for the coastline was defined as being the upland side of tidal flats and rocky inter-tidal zones. Note that the 351 communities are the official municipal names, not including "villages" or other sections of towns. The TOWNSSURVEY_POLYM layer was created by dissolving the TOWNSSURVEY_POLY feature class; a subset of the attribute table was retained, and the AREA and SQUARE_MILES fields were calculated for the entirety of each town.</SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer is the official state-maintained street transportation dataset available from MassGIS and represents all the public and a good portion of the private roadways in Massachusetts, including designations for Interstate, U.S. and State highways. Formerly known as the Massachusetts Highway Department (MHD) Roads, then the Executive Office of Transportation - Office of Transportation Planning (EOT-OTP) Roads, The MassDOT roads layer includes linework from the 1:5,000 road and rail centerlines data that were interpreted as part of the Black and White Digital Orthophoto project. The Massachusetts Department of Transportation - Office of Transportation Planning, which maintains this layer, continues to add linework from municipal and other sources and update existing linework using the most recent color orthophoto imagery as a base. In addition to the new linework, the attribute table includes all "road inventory" items maintained in MassDOT's linear referencing system.</SPAN></P><P><SPAN>The layer is up-to-date through April 3, 2012.</SPAN></P><P><SPAN>In ArcSDE this layer is named EOTROADS_ARC.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Massachusetts Department of Transportation (MassDOT), MassGIS
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This dataset is a polygon representation of the parcels for the Town of Hingham, Massachusetts. The data was originally compiled in an AutoCAD environment and edits were later made through ESRI ArcGIS to the spatial and tabular data in order to bring the file in compliance with November 2010 MassGIS Level III Standards for Digital Parcel Files. These edits included ensuring that the parcel fabric was continuous and closed with no gaps or overlaps. Additionally, parcels were snapped to the legislatively approved MassGIS TOWNSSURVEY_ARC town boundary datalayer and compared against the 2008 30 cm MassGIS Ortho Imagery. Polygons were assigned a LOC_ID that links to the M131Assessor table and other fields were populated where they were known and applicable.</SPAN></P></DIV></DIV></DIV>
Copyright Text: This file was developed by Jason Federico, Polaris, Inc. jaf@polaris.com
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The DEP Wetlands datalayer comprises two feature types, polygons and arcs (lines). The attribute codes in the polygon layer describe different types of wetland environments and the arc attributes describe line types based on adjacent polygon types or arcs defined as hydrologic connections. The wetlands are interpreted from 1:12,000 scale, stereo color-infrared photography (CIR) by staff at UMASS Amherst. The interpretation is field checked by Department of Environmental Protection (DEP) Wetlands Conservancy Program (WCP). Completed interpretations are then scanned and converted into rectified polygons and lines using standard photogrametric techniques by a consultant under contract to the WCP. Final quality control is performed by WCP GIS staff. The polygons and arcs are merged into a single layer (in coverage format) and additional attributes are added for the polygon features. The arc features are coded based on the adjacent polygon types, and attributes are added to the annotation subclass wet. An overlay process using the 1:25,000 Hydrography layer codes the PALIS_ID and PWSID attributes. The coding of the PALIS_ID and PWSID attributes was done using an overlay process and was not subject to the same quality control as the 1:25,000 Hydrography layer. Areas of wetlands in this layer may be shown as open water in the 1:25,000 Hydrography layer and so the coding of the PALIS_ID would not occur. Lines represented in the old 1:5,000 Streams layer are shown in this layer as hydrologic connections. These lines are only defined where they connect the various wetland types. These connections were not delineated within wetland areas, nor does they depict a complete stream network outside of wetland areas. Because the source scale of the CIR?s is 1:12,000, plotting of open water features at a larger scale when overlaid onto existing 1:5,000 imagery will reveal areas of open water that are not delineated as such. It should be noted that the resulting wetlands shown in this datalayer are for planning purposes only. Wetlands boundary determination for other purposes, such as the Wetlands Protection Act MA Act M.G.L. c. 131 or local by-laws, must use the relevant procedures and criteria.</SPAN></P></DIV></DIV></DIV>