Results of terrestrial leveling that was performed between several of the network stations. In April, 2000 Mark Bardakjian of Andregg, Incorporated (a Surveying/Engineering firm in Auburn, CA) ran a series of levels using a digital level between four sets of stations. These stations are all part of the Yolo County GPS/Vertical network observed in 1999. The differences in elevation for the four baselines from Mr. Bardakjians levels are: KEATON-WOODPORT -12.792 FT.  (-3.899M) LIBRARY-HPGN 03 DG -13.774 FT. (-4.198M) LIBRARY-CHURCH -13.785 FT. (-4.202M) FERRY-P 1031 6.070FT. (+1.850M) The results of the National Geodetic Survey adjustment of the Yolo County GPS Subsidence Project ( received April 27, 2000) provided the following elevations for the stations included above (GPS-derived elevations are only published to the nearest centimeter): CHURCH 24.13M FERRY 12.12M HPGN 03 DG 24.13M KEATON 35.84M LIBRARY 19.93M P 1031 10.26M WOODPORT 39.75M Using the NGS GPS-derived elevations the baseline differences are: Baseline (A) NGS Difference (B) Bardakjian Difference (from above) Difference (A)-(B) (cm) Baseline Length (km) KEATON-WOODPORT -3.91M (-3.899M) -1.1 4.4 LIBRARY-HPGN 03 DG -4.20M (-4.198M) -0.2 4.4 LIBRARY-CHURCH -4.20M (-4.202M) +0.2 2.9 FERRY-P 1031 +1.86M (+1.850M) +1.0 6.9 The comparison between the GPS-derived elevation differences and the terrestrial (digital) leveling differences agrees to within about one centimeter or better. er or better. Back to Previous Page Entrance     About the Project Participating Organizations Monitoring Stations     Links