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This data set depicts soil characteristics in western North America. The data set was created from NRCS STATSGO soil data. Calculations were made to reduce one to many relationships to one to one relationships in order to summarize average water capacity, depth to rock, salinity, and pH for each map unit (MUID). ArcMap 8.3 was used to import .dbf files and merge newly created attribute fields to the GIS soil coverage.
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Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987).
This map depicts the distribution of sagebrush and associated shrub-steppe habitat types using readily available data from a variety of source maps from WA, OR, CA, UT, NV, CO, WY, MT, ND, SD, AZ, NM, AB, and BC. Habitat was grouped from map sources that were classified with detailed information on specific sagebrush types, as well as coarse-scale maps that classified vegetation as only "shrub" in the case of ND and the Canadian provinces. This map is a 90-meter grid, but source material included 30 to 90-meter grids, and 1:24,000 and 1:100,000 polygon coverages.
Boundary for floristic regions used for the conservation assessment of Greater Sage-grouse and sagebrush habitat conducted by the Western Association of Fish and Wildlife Agencies. The floristic provinces were digitized from a figure from Miller, R. F., and L. Eddleman, 2001 (See source input for reference).
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This multi-tiered, broad-scale, hierarchical system of ecoregions is based on numerous environmental variables at each level. The first two tiers are based on climate, followed by climate and physiograpghy, and finally topography and soils. This data was used to provide a general description of the ecosystem geography.


    map background search result map search result map 6States_sg_subpopulations_sagemap Bailey's Ecoregions of the Conterminous United States Floristic Provinces of Sagebrush and Associated Shrub-steppe Habitats in Western North America Aquatic Ecoregions of the Conterminous United States Distribution of Sagebrush and Associated Shrub-steppe Habitats in Western North America Average STATSGO Soil Characteristics for the Western United States Risk of Pinyon-Juniper Invasion into Shrubland Habitats 6States_sg_subpopulations_sagemap Average STATSGO Soil Characteristics for the Western United States Floristic Provinces of Sagebrush and Associated Shrub-steppe Habitats in Western North America Risk of Pinyon-Juniper Invasion into Shrubland Habitats Distribution of Sagebrush and Associated Shrub-steppe Habitats in Western North America Aquatic Ecoregions of the Conterminous United States Bailey's Ecoregions of the Conterminous United States