The soil layer contains information about soil as collected by the National Cooperative Soil Survey over the course of a century. The information can be displayed in tables or as maps and is available for most areas in the United States and the Territories, Commonwealths, and Island Nations served by the USDA-NRCS. The information was gathered by walking over the land and observing the soil. Many soil samples were analyzed in laboratories. The maps outline areas called map units. The map units describe soils and other components that have unique properties, interpretations, and productivity. The information was collected at scales ranging from 1:12,000 to 1:63,360. More details were gathered at a scale of 1:12,000 than at a scale of 1:63,360. The mapping is intended for natural resource planning and management by landowners, townships, and counties. Some knowledge of soils data and map scale is necessary to avoid misunderstandings.
This layer represents the soil map unit polygons in a raster format. Raster layers tend to display much more quickly and lend themeselves to certain types of modeling with other raster layers such as landcover, landuse or elevation. Each cell value is represented by the integer version of the mapunit key (MUKEY). The standard character mapunit key (MUKEY) is also included so that the raster attribute table can be joined to other soil attribute tables.
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