Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>MassGIS derived these contours from the </SPAN><SPAN STYLE="font-style:italic;">USGS 2021 Central Eastern MA Lidar Project </SPAN><SPAN>data.</SPAN></P><P><SPAN>The Hydro-enforced digital elevation model (DEM) and water's edge breaklines were processed in ArcGIS Pro 3.0.3 using the </SPAN><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/3d-analyst/contour-with-barriers.htm" STYLE="text-decoration:underline;"><SPAN>Contours with Barriers</SPAN><SPAN>3D</SPAN></A><SPAN> Analyst Tool using a contour interval of 0.3048 (meters).</SPAN></P><P><SPAN>The resultant isolines' meter elevations were then multiplied by 3.28084 in a new field to display the elevations with a vertical resolution of 1.0 foot</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
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Description: 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.