Stations in the USGS's National Stream Quality Accounting Network (NASQAN)
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This is a point coverage of stations in the U.S. Geological Survey's National Stream Quality Accounting Network (NASQAN). NASQAN was established in 1973. Water-...
本数据集为美国地质调查局（U.S. Geological Survey）国家河流质量核算网络（National Stream Quality Accounting Network，NASQAN）所辖监测站点的点位覆盖数据。该网络始建于1973年，水质相关……
