After collection, each point file was differentially corrected using files from Idaho State University (ISU) GIS Training and Research Center's (GIS TReC) GPS Community Base Station, with the exception of those points collected with the HP/Pharos receiver (the Pharos receiver does not collect the necessary information for differential correction
through a base station).
Private companies have set up their own differential correction
systems, such as Deere and Co.
The regression equations that related the elevations measured with the Trimble AgGPS [TM] 132 receiver (y) with the differential correction
turn on to benchmark elevations (x) were:
The primary hardware installed at Morenci by Condor for its first fully integrated Mine Navigation and Machine Control System (MNMCS) included Magellan (Ashtech) GPS/GLONASS RTK receivers - combined GPS/GLONASS differential correction
positioning system to ensure 100% availability for 24-hour operations.
If raw GPS data were collected, the data must now be post-processed downloaded into a PC and differential corrections
applied to each location so that corrected positions can be obtained.
Augmentation System (WAAS), European Geostationary Navigation Overlay Service (EGNOS), Japanese Multi-functional Satellite Augmentation System (MSAS) and QZSS, Indian GPSAided Geo Augmented Navigation (GAGAN) and the System of Differential Correction
and Monitoring (SDCM), increasing reliability in GPS challenged environments.
These are things such as the Ordnance Survey's OS Net, which provides differential corrections
to GNSS signals (such as GPS) to bring that GNSS location provision down to sub-metre accuracy.