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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).
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.
Powerlines in the western United States. Data was obtained from the ICEBMP existing utility corridors data set.
Humans have dramatically altered wildlands in the western United States over the past 100 years by using these lands and the resources they provide. Anthropogenic changes to the landscape, such as urban expansion, construction of roads, power lines, and other networks and land uses necessary to maintain human populations influence the number and kinds of plants and wildlife that remain. We developed the map of the human footprint for the western United States from an analysis of 14 landscape structure and anthropogenic features: human habitation, interstate highways, federal and state highways, secondary roads, railroads, irrigation canals, power lines, linear feature densities, agricultural land, campgrounds, highway...
This model was constructed to model the risk of invasion by exotic plant species. Roads may directly influence exotic plant dispersal via disturbance during road construction or via alterations in soil regimes. For example, in Californian serpentine soil ecosystems, exotic plant species can be found up to 1km from the nearest road and Russian thistle (Salsola kali), an exotic forb growing along roads, is wind-dispersed over distances greater than 4km. Roads may also indirectly facilitate the dispersal of exotic grasses, such as crested wheatgrass (Agropyron cristatum), via human seeding along road verges or in burned areas near roads as a management strategy to curb the establishment of less desirable exotic grass...
map background search result map search result map Communication Towers in the US Proportion of Exotic Grass and Forbs Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Exotic Plant Invasion Risk in the Western United States The Human Footprint in the West Proportion of Juniper Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Juniper Land Cover (540-m 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 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 Proportion of Mixed Shrubland Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Mountain Sagebrush Land Cover in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Sagebrush Land Cover (1-km scale) 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 Shrubland Land Cover (1-km scale) in the Wyoming Basins Ecoregional Assessment area Mean Annual Precipitation within the Wyoming Basins Ecoregional Assessment area Populated Areas in the Western United States Powerlines in the Western United States Density of all roads (km/sq km) within a 3-km radius in the Wyoming Basins Ecoregional Assessment area Soil Depth in the Western United States 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 Juniper Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Juniper Land Cover (540-m 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 Proportion of Low and Black Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mixed Shrubland Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Sagebrush Land Cover (1-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mountain Shrubland Land Cover (1-km scale) in the Wyoming Basins Ecoregional Assessment area Mean Annual Precipitation within 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 The Human Footprint in the West Exotic Plant Invasion Risk in the Western United States Density of Line Features in the Western United States Powerlines in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States Communication Towers in the US