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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents 2000 population density by block group as a 100-m grid using data from the 2000 Census of Population and Housing. The demographic data is from CensusCD 2000 Short Form Blocks published by GeoLytics, E. Brunswick, NJ, which uses the 2000 Census Summary File 1 (SF 1). Grid cell values represent population density in people per square kilometer multiplied by 10 so that the data could be stored as integer.
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.
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 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 All Interstates in the Western United States All Road Density (18km) All Roads in the Western United States 2000 population density by block group for the conterminous United States All Interstates 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) 2000 population density by block group for the conterminous United States