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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.
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...
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 map depicts the proportion of non-Sage-grouse habitat within 54km of each pixel. The map was produced using a moving window analysis on the Distribution of Non-Sage Grouse Habitat in the Conservation Assessment Area with a search radius of 54km. The product of the moving window was the mean pixel value within the window. This map has a 540m resolution.
map background search result map search result map All Big Sagebrush Species Land Cover in the Wyoming Basins Ecoregional Assessment area Compound Topographic Index in the Wyoming Basins Ecoregional Assessment area Proportion of Exotic Grass and Forbs Land Cover (3-km scale) 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 Exotic Plant Invasion Risk in the Western United States Proportion of Grassland Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Grassland Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area 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 Proportion of Mixed Shrubland Land Cover (18-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 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 Proportion of Non-Sage-grouse Habitat Within an 54-km Radius Proportion of Mountain Sagebrush Land Cover (270-m scale) in the Wyoming Basins Ecoregional Assessment area All Big Sagebrush Species Land Cover in the Wyoming Basins Ecoregional Assessment area Compound Topographic Index in the Wyoming Basins Ecoregional Assessment area Proportion of Exotic Grass and Forbs Land Cover (3-km scale) 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 Grassland Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Grassland Land Cover (540-m 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 The Human Footprint in the West Exotic Plant Invasion Risk in the Western United States Average Normalized Difference Vegetation Index (NDVI) for the western United States (1989-2002) Proportion of Non-Sage-grouse Habitat Within an 54-km Radius Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States