The Land Survey Information System (LSIS) website contains a collection of geographic information from the Bureau of Land Management's (BLM) Geographic Coordinate Data Base (GCDB), representing the Public Land Survey System (PLSS) of the United States. The Land Survey information is available to download free of charge. The GCDB grid is computed from BLM survey records (official plats and field notes), local survey records, and geodetic control information.
