stationtypecode, station type, description 1, Small fiberglass shelter, typically 1m x 1m x 1m 2, Small prefabricated metal bldg, typically 1-2m x 1-2m x 2m high 3, Sensors buried/set in ground, shallow near surface 4, Reference station, typically 1-2 story small light bldg 5, Base of building , larger than 1-2 story small light bldg 10, Building 11, Bridge 12, Dam 20, Other structure 50, Geotechnical array 51, Other array