Skip to main content
Advanced Search

Folders: ROOT > ScienceBase Catalog > Forest and Rangeland Ecosystem Science Center (FRESC) > FRESC Public Data > SAGEMAP > The Human Footprint in the West: A Large-scale Analysis of Anthropogenic Impacts ( Show direct descendants )

32 results (66ms)   

Location

Folder
ROOT
_ScienceBase Catalog
__Forest and Rangeland Ecosystem Science Center (FRESC)
___FRESC Public Data
____SAGEMAP
_____The Human Footprint in the West: A Large-scale Analysis of Anthropogenic Impacts
View Results as: JSON ATOM CSV
Development of oil and gas wells leads to the destruction and fragmentation of natural habitat. Oil and gas wells also increase noise levels which has been shown to be detrimental to some wildlife species. Therefore, the density of oil and gas wells in the western United States was modeled based on data obtained from the National Oil and Gas Assessment.
Locations of railroad lines for 11 western states. The Bureau of Transportation Statistics 1:100k Railroads line network was clipped to the boundary of the 11 Western States.
thumbnail
Model of habitat utilization by synanthropic avian predators: common ravens (Corvus corax), American crows (Corvus brachyrhynchos), and black-billed magpies (Pica hudsonia). The former two species show increasing nation-wide population trends, and common ravens in the Mojave desert have been shown to have detrimental effects on threatened desert tortoise (Gopherus agassizii) populations. Power lines are used by common ravens and other raptors for nesting and as hunting perches. Linear features such as railroads, primary and secondary roads, and irrigation channels often serve as travel routes for these predators, and expand their movements into previously unused regions. Numbers of synanthropic avian predators increase...
This model is based on how house cats utilize wildlands near human habituation. These predators can have detrimental effects on wildlife populations (Alterio et al. 1998). We based our model on the data collected by Odell and Knight (2001) that investigated habitat utilization of these predators with regard to distance from housing and on the probability for a homeowner to possess a house cat. We buffered the populated areas distance layer in ARC/INFO using a probability function [P = 0.216 - 0.96 * Distance (km)] where any cell with distance less than 0.18km received a probability between 0.216 to 0. All distances greater than or equal to 0.18km from populated areas were assigned a probability of 0. The resulting...
thumbnail
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...
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.
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...
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...
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.
thumbnail
Locations of oil and gas wells in 11 western states. Data was obtained from the National Oil and Gas Assessment.
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.
All secondary roads in the western United States from the 2000 US Census TIGER/line files. Secondary roads are defined as all roadways not classified as an interstate, state highway, or federal highway.
map background search result map search result map The Human Footprint in the West All Secondary Roads in the Western United States Probability of Synanthropic Feral House Cat Presence in the Western United States Probability of Synanthropic Corvid Presence in the Western United States Exotic Plant Invasion Risk in the Western United States The Human Footprint in the West 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) Railroads in the Western United States Oil and Gas Well Density in the Western United States Oil and Gas Wells in the western United States (NOGA 1994) Populated Areas in the Western United States Populated Areas in the Western United States Powerlines 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 The Human Footprint in the West Exotic Plant Invasion Risk 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) Landfills in the Western United States All Interstates in the Western United States Railroads in the Western United States Powerlines in the Western United States All State and Federal Highways in the Western United States Probability of Synanthropic Corvid Presence in the Western United States All Secondary Roads in the Western United States The Human Footprint in the West Probability of Synanthropic Feral House Cat Presence in the Western United States Oil and Gas Well Density in the Western United States Topographic Accessibility Index Oil and Gas Wells in the western United States (NOGA 1994) Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States