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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...
Density of linear features, such as roads, power lines, telephone lines, and railroad tracks have been shown to influence synanthropic predator abundance patterns (Knight et al. 1995). Following Knight et al. (1995), we used linear features such as roads, railroads, and power line spatial data sets, but also included irrigation canals, to build a linear features spatial data set. However, we lacked spatial data on telephone and feeder-power lines and therefore our linear feature spatial data set vastly underestimates the number of linear features in some areas.
This is a map of populated areas with population density greater than or equal to 1 individual/ha (i.e., rural/exurban but including suburban and urban as defined by Marzluff et al. 2001) as determined from U.S. Census data corrected for public lands.
This is a map of populated areas with population density greater than or equal to 1 individual/ha (i.e., rural/exurban but including suburban and urban as defined by Marzluff et al. 2001) as determined from U.S. Census data corrected for public lands.
Locations of landfills and waste transfer stations in 11 western states. Data was obtained from state and federal agencies in GIS, tabular, and map format.
Elevation in the western United States obtained from the National Elevation Dataset. Data was converted from float point to integer format and re-sampled from 30m resolution to 90m resolution.
    map background search result map search result map All Roads in the Western United States All Interstates and State and Federal Highways in the Western United States Canals in the Western United States Elevation in the Western United States (90 meter DEM) All Interstates in the Western United States Landfills in the Western United States Density of Line Features in the Western United States Average Normalized Difference Vegetation Index (NDVI) for the western United States (1989-2002) Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States All State and Federal Highways in the Western United States Topographic Accessibility Index Density of Line Features in the Western United States Average Normalized Difference Vegetation Index (NDVI) for the western United States (1989-2002) Landfills in the Western United States All Interstates in the Western United States Canals in the Western United States All State and Federal Highways in the Western United States All Interstates and State and Federal Highways in the Western United States All Roads in the Western United States Elevation in the Western United States (90 meter DEM) Topographic Accessibility Index Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States