미국
BLM OR Hydrography Waterbody Polygon Hub
HYD_WATERBODY_POLY: This dataset contains waterbody features from the US Geologic Survey (USGS) High Resolution National Hydrography Dataset (NHD). NHD waterbody features include polygons depicting Lake/Ponds, swamp/marsh, estuaries, etc. Additional attributes have been added from the Bureau of Land Management (BLM) hydrography event data. This data will be refreshed as-needed to reflect updates to the NHD and Bureau of Land Management (BLM) hydrography event data.