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About the Overview Maps
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The maps on these pages are intended to display the major geographic features in the regions near Class I Areas. The display are intended to allow the viewer to orient themselves as to where various features are with respect to the Class I Areas and the 50-km "analysis" areas. Features shown on these maps include the Class I Area or Areas, the 50-km analysis areas, urban areas, water bodies, major airports and marine ports in the region, roadways and railroads. Also displayed are the state and county boundaries. Each map displays a region approximately 350-km by 350-km centered on the Class I Area or Areas of interest.
GIS Data Sources
A variety of geospatial data were used for developing these displays. The following GIS data were used for developing maps and spatial surrogates for allocation of area and mobile source emissions:
- Land Use/Land Cover (LULC) - specifies land types (urban, agricultural, forest, etc) and areal coverage for spatial allocation of area sources. These data are primarily derived from USGS databases of varying vintage from the late 1970s through the early 1990s
- EPA Spatial Surrogate database (Housing statistics, urban/rural classification, agricultural lands, forest lands) (ftp://ftp.epa.gov/EmisInventory/emiss_shp)
- North America Land Cover Characteristics (NALCC) (Alaska only)- High resolution (1-km) LULC coverage for the North American Continent - Includes a modified Anderson Level 2 classification scheme (http://edcdaac.usgs.gov/glcc/tabgoode_globe.html). These data are derived primarily from satellite images acquired during 1993.
- Transportation Networks - Specifies roadway types, railways, airport and ports used for spatial allocation of on-road mobile and off-road mobile emission sources. The EPA Spatial Surrogate database was used for these categories. (ftp://ftp.epa.gov/EmisInventory/emiss_shp). These data were derived from the 1990 US Census TIGER data files.
GIS data defining the locations of the Class I Areas within the WRAP States were obtained from the National Park Service web site at http://www2.nature.nps.gov/ard/parkhp.html. These data are maintained by the specific government agency responsible for each Class I Area. This includes the US Dept. of the Interior National Park Service, the US Dept. of the Interior Fish and Wildlife Service and the US Dept. of Agriculture Forest Service. Additional GIS data used to delineate the Class I Area boundaries were obtained from http://www.nationalatlas.gov/wildrnm.html
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