These are counts that States use in redistricting. This coverage is intended to be used for any desired GIS application involving total population or housing. The National Water Quality Assessment program intends to use the population data to indicate areas of suburban and urban development, which will have an impact on water quality. Performing any kind of spatial relationship with this coverage will have an undetermined margin of error since each point represents data from a polygon whose boundaries are not present. U.S. Geological Survey, Water Resources Div.
Point features present.
The earlier version did not contain the housing unit data. This is a menu-driven program that allows the user to select the geographic level of detail and fields to be extracted from the data base. The data is organized by state. The output from the program was a flat file of data for each state. Land and water area measurements, which were reported in thousandths of square kilometers in the original data, were changed to square kilometers in the coverages.