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What sources of elevation data were used to create the shaded relief?

Small-scale shaded relief layers (30 arc-seconds and larger cell sizes) are derived from the USGS GTOPO30 dataset. Medium- and large-scale shaded relief layers (up to 16 arc-second cell size) are derived from the 1/3 arc-second DEM layer of The National Map.

Tags: Maps, Topographic, Recreation, Quadrangle, GeoPDF, Scale