Since 1990, portions of the land use inventories have been adjusted to fit large-scale (1"=200' scale or 1"=100' scale) cadastral mapping where such mapping has been completed. Therefore, ninety percent or more of all well-defined planimetric features in portions of the 1990, 1995, and 2000 land use digital map files are within 6.6 feet of their true position. For the remaining portions of the 1990, 1995, and 2000 land use digital map files, ninety percent or more of all well-defined planimetric features in these areas are within 13.3 feet of their true position.
The digital map files for the 1963, 1970, 1980, 1985, 1990, 1995, and 2000 land use inventories are arranged to cover one USPLSS township per file. The files are available in ESRI shapefile and coverage format.
The digital files contain land use polygon features digitized from land use areas initially delineated on hardcopy products (1"=400' scale aerial photos and maps) for each year of inventory. The 1990, 1995, and 2000 inventories contain polygons that have been adjusted to fit large-scale cadastral mapping where such mapping had been completed at the time of inventory collection. The land use polygons are identified by a tag or label consisting of a three-digit code and optional one-character suffix corresponding to the Commission's land use classification system. All files consist of graphic map features only and do not contain additional attributes at this time.