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Yan M. Wang and D.R. Roman National Geodetic Survey NOAA Potsdam, Germany, July 5-9, 2004

Validation of Gravity Models from CHAMP/GRACE Gravity Missions Using the GPS/leveling Data from the Continental US. Yan M. Wang and D.R. Roman National Geodetic Survey NOAA Potsdam, Germany, July 5-9, 2004. Overview.

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Yan M. Wang and D.R. Roman National Geodetic Survey NOAA Potsdam, Germany, July 5-9, 2004

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  1. Validation of Gravity Models from CHAMP/GRACE Gravity Missions Using the GPS/leveling Data from the Continental US Yan M. Wang and D.R. Roman National Geodetic Survey NOAA Potsdam, Germany, July 5-9, 2004

  2. Overview • Validate GGM01S/C & EIGEN_3P against 14460 GPS/leveling implied geoid undulations scattered over the U.S. and parts of Canada • Compare GGM01S/C & EIGEN_3P to geoid changes deduced from 10 years of TOPEX/Poseidon altimetry data over the Great Lakes

  3. GPS/leveling Comparisons Comparison description: • Geoid is computed from coefficient models in full degree and order and to degree and order 90, then augmented with EGM96 to degree 360 • GPS/leveling data are converted from NAVD88 to ITRF96, then compared with models

  4. Statistics of DifferencesUnits are in cm

  5. Statistics of DifferencesUnits are in cm

  6. Lake Geoid Comparisons Comparison description: • Lake surface is an equipotential surface • 10 years of TOPEX/Poseidon altimeter data provide accurate mean lake surface with 2-3 cm accuracy (Beckley, private communication) • Geoid changes are compared over two tracks (Lake Superior and Huron)

  7. T/P Tracks Over Lake Superior

  8. Statistics of Differences(Lake Superior)Units are in cm

  9. Statistics of Differences(Lake Superior)Units are in cm

  10. T/P Tracks Over Lake Huron

  11. Statistics of Differences(Lake Huron)Units are in cm

  12. Statistics of Differences(Lake Huron)Units are in cm

  13. Conclusions • Cutoff degree and orders at 90 for all models and augmented by EGM96 to 360 improves the comparisons • GGM01S (n<=90)+EGM96 performs the best in GPS/leveling comparisons • GGM01C performs the best in lake surface comparisons • Recommendations: GGM01S (n<=90)+EGM96 is recommended

  14. Web Information • Lake monitoring program supported by USDA: http://www.pecad.fas.usda.gov/cropexplorer/global_reservoir

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