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The topographic accessibility index is a measure of elevation in relation to valley floor corrected for variation in valley floor elevation across the western United States (i.e., valley floor elevation at California's coast is much lower compared to a valley floor in Wyoming). This index was based on 90-m resolution digital elevation model grids (DEM; National Elevation Dataset, USGS EROS [Earth Resources Observation Systems],3), and a landform model of the western United States (Manis et al. 2001), which delineates valley flats and near level plateaus or terraces (cell values, 1 or 4). We reclassified the landform model (cell value, 1) and multiplied this layer by the DEM to derive valley floor elevation. Using...
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This map was developed to show the distribution of human influence in the western United States. This dataset was developed from the Human Footprint in the western United States (Leu et al. 2008) in order to ease the interpretation of human footprint comparisons.
    map background search result map search result map Aspect in the Wyoming Basins Ecoregional Assessment area Compound Topographic Index in the Wyoming Basins Ecoregional Assessment area Elevation in the Wyoming Basins Ecoregional Assessment area Human Footprint Intensity in the West Solar Radiation Index in the Wyoming Basins Ecoregional Assessment area Southwestness in the Wyoming Basins Ecoregional Assessment area Topographic Accessibility Index Topographic Ruggedness Index in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (1-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (3-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (18-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (270-m scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (540-m scale) in the Wyoming Basins Ecoregional Assessment area Solar Radiation Index in the Wyoming Basins Ecoregional Assessment area Aspect in the Wyoming Basins Ecoregional Assessment area Compound Topographic Index in the Wyoming Basins Ecoregional Assessment area Elevation in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (1-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (3-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (18-km scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (270-m scale) in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (540-m scale) in the Wyoming Basins Ecoregional Assessment area Southwestness in the Wyoming Basins Ecoregional Assessment area Topographic Accessibility Index Human Footprint Intensity in the West