Combination of Irrigation Sources on Agricultural Land in the Conterminous United States, 1992: National Resource Inventory Conservation Practice ISO05

This data set represents the estimated percentage of the 1-km grid cell that is covered by or subject to
the agricultural conservation practice (CPIS05), Combination of Irrigation Sources (CIS) on agricultural
land by county. A combination of irrigation sources means one or more sources of irrigation, such as
wells, ponds, or streams are used on agricultural land. (U.S. Department of Agriculture, 1995) This data
set was created with geographic information systems (GIS) and database management tools. The acres
on which CIS's are applied were totaled at the county level in the tabular NRI database and then apportioned
to a raster coverage of agricultural land within the county based on the Enhanced National Land Cover Dataset
(NLCDe) 1-kilometer resolution land cover grids (Nakagaki, 2003). Federal land is not considered in this analysis
because NRI does not record information on those lands.