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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.
Cellular phone microwave towers registered with the U.S. Federal Communications Commission. Not all antennas are required to be registered with the FCC, therefore, this data set does not necessarily depict all cellular phone communication towers actually present on the landscape. The source data are updated weekly by the FCC as new permits are issued. However, this particular data set is designed for a specific analysis, and is planned to remain static as of the publication date (7/22/2007).
This map was developed to examine multi-scale spatial relationships between percentage of sagebrush and other response variables of interest. A map of sagebrush in the western United States was used as a base layer for a moving window analysis to calculate the percentage of the area classified as sagebrush within the given search radius.
This map was developed to examine multi-scale spatial relationships between percentage of sagebrush and other response variables of interest. A map of sagebrush in the western United States was used as a base layer for a moving window analysis to calculate the percentage of the area classified as sagebrush within the given search radius.
A complete set of wells associated with oil, natural gas, and coal bed natural gas development in the western states as of June 2004. This is a static dataset even though liquid energy development is a highly dynamic endeavor. Because these well location datasets are generally housed and managed by various state-based agencies (typically the state Oil and Gas Conservation Commissions) a uniform, spatially precise coverage for the western United States has not been available to date. This layer consolidates the best available well location data from ND, SD, MT, WY, CO, NM, UT, AZ, OR, and CA (ID and WA do not report any liquid energy development) and standardizes the attributes. While static as of June 2004 the well...
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Comma-separated values (.csv) file containing data related to mercury in smallmouth bass (Micropterus dolomieu) collected from the Snake River, USA.
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.
map background search result map search result map Oil and Natural Gas Wells, Western U.S. Communication Towers in the US Proportion of Exotic Grass and Forbs Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Juniper Land Cover in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Density of Line Features in the Western United States Mountain Sagebrush Land Cover in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Sagebrush Land Cover (270-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Shrubland Land Cover (1-km scale) in the Wyoming Basins Ecoregional Assessment area Populated Areas in the Western United States Density of all roads (km/sq km) within a 3-km radius in the Wyoming Basins Ecoregional Assessment area Proportion of Riparian Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Percent Area of Sagebrush Habitat Within an 18-km Radius Percent Area of Sagebrush Habitat Within an 100-km Radius Topographic Accessibility Index Distance (m) to communication towers in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (18-km scale) in the Wyoming Basins Ecoregional Assessment area Mercury in smallmouth bass from the Snake River, USA, 2013-2022 Mercury in smallmouth bass from the Snake River, USA, 2013-2022 Proportion of Mountain Sagebrush Land Cover (270-m scale) in the Wyoming Basins Ecoregional Assessment area Mountain Sagebrush Land Cover in the Wyoming Basins Ecoregional Assessment area Proportion of Exotic Grass and Forbs Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Juniper Land Cover in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Shrubland Land Cover (1-km scale) in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 3-km radius in the Wyoming Basins Ecoregional Assessment area Proportion of Riparian Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Distance (m) to communication towers in the Wyoming Basins Ecoregional Assessment area Topographic Ruggedness Index (18-km scale) in the Wyoming Basins Ecoregional Assessment area Density of Line Features in the Western United States Oil and Natural Gas Wells, Western U.S. Percent Area of Sagebrush Habitat Within an 100-km Radius Percent Area of Sagebrush Habitat Within an 18-km Radius Topographic Accessibility Index Populated Areas in the Western United States Communication Towers in the US