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2008. World Wildlife Fund (WWF). HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales)flow accumulation maps define amount of upstream a... U.S. Geological Survey.
2008. World Wildlife Fund (WWF). This raster layer is a void-filled digital elevation model (DEM) of Europe at 15 arc-seconds resolution. Elevation is expressed in meters and refer... U.S. Geological Survey.
2008. World Wildlife Fund (WWF). HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales) provides hydrographic information in a consistent... U.S. Geological Survey.