DEM Data Sources

• 30m DEMs from 1:24,000 scale maps (urban watersheds)

• 3" (100m) DEMs from 1:250,000 scale maps (rural watersheds)

• 15" (500m) DEM for the US resampled from 3” DEM (large drainage basins)

• 30" (1km) DEM of the earth (GTOPO30)

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