Hydrography data

DDM30 (Global 30-min Drainage Direction Map)
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HYDRO1k (Global Elevation Derivative Database)
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HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales)
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NHD (National Hydrography Dataset; USA)
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SWBD (Shuttle Radar Topography Mission Water Body Dataset)
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