Skip to main content
Advanced Search

Filters: partyWithName: Wiley (X) > Types: Raster (X)

14 results (96ms)   

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.
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...
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 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 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...
Human-induced fires have increased the frequency at which fires occur on the landscape. Fires increase the probability of invasion by exotic plant species as well as destroy existing habitats. This model was developed to depict the density of human caused fire ignition points throughout the western United States. Data from the National Fire Ignition Database from 1986 to 2001 was used to calculate the density of human-induced fire ignitions (ignitions / km).
This map depicts the forested regions in the western United States. Data was obtained from the the Sagestitch map and other state-level GAP land cover maps and merged into 90m raster dataset.
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 180m resolution.
This model is based on how dogs 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 dog. We buffered both the populated areas and the campground distance layers in ARC/INFO using probability functions [P = 0.548 - 1.4589 * Distance (km)]. Any cell with distance less than 0.36km received a probability based on the function (0.556 to 0.001572) and all distances greater than or equal to 0.36km from populated areas or campgrounds...
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.
thumbnail
We evaluated the fragmentation of the western United States by anthropogenic features. The addition of roads, railroads, and power lines to wildlands, and the conversion of wildlands to agricultural land and/or urban areas, induces fragmentation. We used the following spatial data sets to model anthropogenic fragmentation: agricultural land, populated areas, power lines, railroads, and roads. Because we were interested in the spatial arrangements of wildland patches and how anthropogenic fragmentation affects wildlife dispersal, we buffered some of these spatial data sets according to their area of influence. For example, the area of influence of interstate highways extends beyond the traffic lanes (Rowland et al....
    map background search result map search result map Probability of Synanthropic Feral House Cat Presence in the Western United States Elevation in the Western United States (90 meter DEM) Elevation in the Western United States (180 meter DEM) Probability of Synanthropic Feral Dog Presence in the Western United States Exotic Plant Invasion Risk in the Western United States Human Caused Fire Density in the Western United States (1986 - 2001) Forested Areas in the Western United States Anthropogenic Fragmentation in the western United States The Human Footprint in the West Average Normalized Difference Vegetation Index (NDVI) for the western United States (1989-2002) Oil and Gas Well Density in the Western United States Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States 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) Human Caused Fire Density in the Western United States (1986 - 2001) Forested Areas in the Western United States Elevation in the Western United States (90 meter DEM) Probability of Synanthropic Feral House Cat Presence in the Western United States Probability of Synanthropic Feral Dog Presence in the Western United States Oil and Gas Well Density in the Western United States Elevation in the Western United States (180 meter DEM) Anthropogenic Fragmentation in the western United States Populated Areas in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States