County Boundaries

Polygon features which represent the political boundary of each county in the State of Maryland. The Maryland Political County Boundaries were developed using USGS...本数据集包含表征马里兰州各郡政治边界的多边形要素（Polygon features）。马里兰州郡级政治边界数据集采用美国地质调查局（United States Geological Survey，USGS）的相关数据开发编制而成……