Boundary, Ipswich Watershed, Wilmington, 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（political boundary datalayer）以多边形形式表达城镇边界，其数据源自马萨诸塞州351个社区（含市、镇）的《港湾与土地委员会城镇边界图集》（共68卷）中提取的测量坐标所生成的弧段，经构建而成。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。对于拥有海岸边界的社区，马萨诸塞州地理信息系统（MassGIS）会同马萨诸塞州水资源管理局与马萨诸塞州环境保护部，完成了比例尺为1:12000的海岸线数据制作。该海岸线的边界被定义为潮滩与岩质潮间带的陆侧区域。请注意，此351个社区均为官方核定的市政名称，不包含"村庄"或城镇的其他分区。备注：完整元数据可在下载的压缩包中获取，可通过ESRI ArcGIS软件进行查看，且可导出为联邦地理数据委员会（FGDC）与国际标准化组织（ISO）元数据格式。