Boundary, Ipswich Watershed, Parker Watershed, Georgetown, Massachusetts - vector

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. Note: Complete metadata is available within the downloaded zip file. This metadata can be viewed with ESRI ArcGIS software, and can be exported to FGDC and ISO metadata formats.

本行政边界数据图层为城镇边界的多边形矢量表达，其数据源自从68卷《港口与土地委员会城镇边界图集》中提取的测量坐标所生成的弧段，覆盖马萨诸塞州的351个社区（含市县）。该图集于20世纪初出版，由马萨诸塞州公路局测量科负责维护。
对于设有海岸边界的社区，马萨诸塞州地理信息系统（MassGIS）联合马萨诸塞州水资源管理局与环境保护厅，完成了比例尺为1:12000的海岸线数据。该海岸线的边界被划定为潮滩与岩质潮间带的陆侧区域。
请注意，此处的351个社区均采用官方市政名称，不包含“村庄”或城镇的其他分区。
注：完整元数据可在下载的压缩包中获取，可通过ESRI ArcGIS软件查看，并可导出为FGDC及ISO元数据格式。