By Glen Mattioli, UNAVCO - Fall 2012
Currently, there are 1120 GPS sites and 28 tilt meters, as well as numerous other strainmeters actively measuring deformation. In 2008, PBO became the steward of 209 existing GPS sites from the SCIGN, BARD, BARGEN networks. One of the most comprehensive upgrades was conducted at VNDP (Vandenberg Air Force Base), an IGS reference frame station, which significantly improved the state of health and data quality. The VNDP upgrade yielded significant improvements in data quality.
New GPS stations (above right) at Vandenberg AFB have been installed, replacing outdated systems (above left)