Boundary, Ipswich Watershed, North Reading, 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）以多边形形式表征马萨诸塞州351个社区（即各市镇）的城镇边界，其数据源自针对该州351个社区（各市镇）的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。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。对于带有海岸边界的社区，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。该海岸线的边界被划定为潮滩与岩质潮间带的陆侧区域。请注意，此处提及的351个社区均为官方法定市政名称，不包含“村庄”或城镇的其他附属分区。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，且可导出为FGDC及ISO元数据格式。