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1992 and 1993. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.
2009. World Wildlife Fund (WWF). This drainage direction map for North America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.
2009. World Wildlife Fund (WWF). This drainage direction map for North America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.
2009. 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.
2009. 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.