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Density (km / km^2) of all roads in the western United States. Dataset was developed to generalize the 2000 US Census TIGER/Line Roads layer to a density within 18km of each pixel. Obtained from 2000 US Census TIGER/Line Roads using LINEDENSITY with an 18km search radius.
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.
Major roads in northern North America as determined by the U.S. National Atlas and The National Atlas of Canada (geogratis.cgdi.gc.ca). National data layers were re-attributed and merged to create a seamless major road layer for North America.
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.
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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....
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The U.S. Geological Survey (USGS) maintains over 8,000 streamgages across the U.S. Streamgages in Illinois are operated by the USGS Illinois-Iowa Water Science Center (USGS IL-IA WSC). Gage-height data at many USGS streamgages were collected on paper-punch tapes during the period of 1965 to 1985 in Illinois. These data were not saved in the National Water Information System (NWIS) due to lack of sufficient computer storage at that time. The USGS IL-IA WSC currently has the equivalent of 2,049 years of data from 152 streamgages on paper tapes stored at the National Archive and Records Administration (NARA) Federal Records Center that are not in NWIS. All of these data need to be stored in NWIS for public use before...
    map background search result map search result map All Roads in the Western United States All Interstates and State and Federal Highways in the Western United States All Secondary Roads in the Western United States Anthropogenic Fragmentation in the western United States Distance (m) to an interstate highway within the Wyoming Basins Ecoregional Assessment area All Interstates in the Western United States Major Highways in North America Density of Line Features in the Western United States Density of all roads (km/sq km) within a 1-km radius 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 Density of all roads (km/sq km) within a 5-km radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 18-km radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 270-m radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 540-m radius in the Wyoming Basins Ecoregional Assessment area All Road Density (18km) All State and Federal Highways in the Western United States All Roads in the Western United States Gage Height Data, Friends Creek at Argenta, Illinois, 1971-1982 Gage Height Data, Friends Creek at Argenta, Illinois, 1971-1982 Distance (m) to an interstate highway within the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 1-km radius 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 Density of all roads (km/sq km) within a 5-km radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 18-km radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 270-m radius in the Wyoming Basins Ecoregional Assessment area Density of all roads (km/sq km) within a 540-m radius in the Wyoming Basins Ecoregional Assessment area Density of Line Features in the Western United States All Interstates in the Western United States All State and Federal Highways in the Western United States All Interstates and State and Federal Highways in the Western United States All Secondary Roads in the Western United States All Roads in the Western United States All Roads in the Western United States All Road Density (18km) Anthropogenic Fragmentation in the western United States Major Highways in North America