Elevation-Derived Hydrography in the Upper Shawsheen River Basin, Massachusetts

The U.S. Geological Survey (USGS), in cooperation with the Air Force Civil Engineer Center (AFCEC), has compiled Geographic Information Systems (GIS) datasets. The...美国地质调查局（U.S. Geological Survey, USGS）与空军土木工程中心（Air Force Civil Engineer Center, AFCEC）合作，编制了地理信息系统（Geographic Information Systems, GIS）数据集。该……