Flow direction raster for Pennsylvania StreamStats

The U.S. Geological Survey (USGS), in cooperation with the Federal Emergency Management Agency, Pennsylvania Department of Environmental Protection, Pennsylvania...美国地质调查局（U.S. Geological Survey, USGS）与联邦紧急事务管理局（Federal Emergency Management Agency）、宾夕法尼亚州环境保护部（Pennsylvania Department of Environmental Protection）等机构开展合作，宾夕法尼亚州……