Boundary, Ipswich Watershed, Middleton, 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.

本行政区划边界数据图层（political boundary datalayer）为马萨诸塞州351个社区（含市县）的城镇边界多边形表示，其数据源自从68卷《港口与土地委员会城镇边界图集》（Harbor and Lands Commission Town Boundary Atlas）中提取的测量坐标生成的弧段。该图集出版于20世纪初，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（Massachusetts Geographic Information System，MassGIS）联合马萨诸塞州水资源管理局与环境保护厅完成了1:12000比例尺的海岸线图层。该海岸线图层的边界被定义为潮滩与岩质潮间带的陆侧边界。请注意，本次收录的351个社区均采用官方市政名称，不包含“村庄”或城镇的其他片区。注：完整元数据（Metadata）可在下载的压缩包中获取，可通过ESRI ArcGIS软件查看，并可导出为联邦地理数据委员会（Federal Geographic Data Committee，FGDC）及国际标准化组织（International Organization for Standardization，ISO）元数据格式。