USGS Streamgages Linked to the Medium Resolution NHD

The locations of approximately 23,000 current and historical U.S. Geological Survey (USGS) streamgages in the United States and Puerto Rico (with the exception of Alaska) have been snapped to the medium resolution National Hydrography Dataset (NHD). The NHD contains geospatial information about mapped surface-water features, such as streams, lakes, and reservoirs, etc., creating a hydrologic network that can be used to determine what is upstream or downstream from a point of interest on the NHD network. An automated snapping process made the initial determination of the NHD location of each streamgage. These initial NHD locations were comprehensively reviewed by local USGS personnel to ensure that streamgages were snapped to the correct [...]

美国本土及波多黎各（阿拉斯加州除外）境内约23000个现役与历史存续的美国地质调查局（U.S. Geological Survey, USGS）河道流量监测站的点位，已被吸附匹配至中等分辨率国家水文数据集（National Hydrography Dataset, NHD）。该数据集涵盖溪流、湖泊、水库等已测绘地表水体要素的地理空间信息，构建出可用于判定NHD网络内任意关注点上下游关系的水文网络。自动吸附匹配流程首先确定了各监测站在NHD中的初始点位。上述初步匹配得到的NHD点位，已由USGS当地工作人员开展全面复核，以确保监测站被正确吸附匹配至[...]