Washington DC Historic Boundary
收藏官方服务：
资源简介：
The Washington D.C. historic boundary was created by connecting all the boundary stone locations to form the DC Maryland border. The vast majority of the stones were located using a field survey in 2011, which employed a GPS-RTK. On the DC Virginia border the line follows the western shoreline of the Potomac River. Read supplemental metadata for more details on the survey.
创建时间：
2015-02-28
