Stations were also reviewed for known subsidence

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term viability of the site as part of the network. Stations were also reviewed for known subsidence issues in their area and one station was rejected based on that issue. It was decided that each station was to be the Wyatt drilled-braced monument with choke ring antenna with radome that were installed by the SCIGN group (SCIGN web site). These stations have been shown to have the best stability, with the least measurement noise (Williams et al, 2004). Stations installed in the earlier years of the SCIGN project had less rigorously designed monuments and were used in only a few cases where there was not a more suitable monument available (VTIS, VNDP and VNPS). Each station’s vertical time series was reviewed to select those stations that had the lowest RMS values. Stations with RMS ≤ 5mm in the vertical were selected. Geometry of the network was a major consideration, so after stations were evaluated on all the above criteria, they were chosen to provide 80 km spacing over the 10 counties (or as close to that as possible) with the qualified stations. After evaluating these issues and the estimated cost on a station by station basis, the following 20 stations were chosen and are shown in Figure No. 1. Version 1.10 (October 28, 2004) Page 3 of 36 6/14/2018 2:20 AM
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1. CRBT – Camp Roberts, Monterey County 2. USLO – Cal Poly State University, San Luis Obispo County 3. VNDP – Vandenberg Air Force Base, Santa Barbara County 4. COPR – Coal Point Oil Reserve, Santa Barbara County 5. BVPP - Buena Vista Pumping Plant, Kern County 6. RSTP – Rosamond Treatment Plant, Kern County 7. CCCC - Cerro Coso Community College, Kern County 8. LVMS – Lockwood Valley Maintenance Station, Ventura County 9. TOST – Thousand Oaks Sheriff Station, Ventura County 10. VNPS – Vincent Pump Station, Los Angeles County 11. VNCX – Van Norman Complex, Los Angeles County 12. ELSC – East Los Angeles Science Center, Los Angeles County 13. VTIS – Marine Exchange, Los Angeles County 14. BSRY – Barstow Road Yard, San Bernardino County 15. BKAP – Baker Airport, San Bernardino County 16. NDAP – Needles Airport, San Bernardino County 17. MVFD– Montezuma Valley Fire Department, San Diego County 18. NSSS – Naval Space Surveillance Station, San Diego County Version 1.10 (October 28, 2004) Page 4 of 36 6/14/2018 2:20 AM Figure No. 1. Map showing CGPS Stations included in leveling contract.
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19. GLRS – Galeano Reservoir, Imperial County 20. IID2 – Imperial Irrigation District, Drop 2, Imperial County Selection of Leveling Specifications As stated above, we needed to achieve final elevations that would be accurate enough to use as vertical control in the orthometric height adjustment to provide final GPS derived orthometric heights at the ±2 cm level. We had to evaluate several factors to determine what specification to follow. While we would have liked to achieve the vertical accuracy provided by First Order leveling, we had to consider the high cost of this type of leveling and the fact that few consultants would have the expertise or equipment to perform this type leveling, and would therefore limit the response to our contract. Another limitation we had to consider was the allotted budget amount for this project. We decided to use the
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