Horizontal Positional Accuracy Data was collected in the field and plotted on a variety of base maps. Archaeological properties visited in the past 30 years are located on USGS maps. Almost all site locations are accurate to the quarter section. Most site locations are accurate to within a quarter-quarter section. Site boundaries are poorly defined, as are site centroids.
Database contains as assessment as to the accuracy of the property's location.
Database is maintained at irregular intervals. Records are edited on an ongoing basis. New properties are added to the database on at least a yearly basis. The SHPO Archaeological database has a simple variable-attribute structure. Each record corresponds to an individual property.