POD/Geoid splinter

Wednesday March 14, 2007

Morning and Afternoon

J.P. Berthias – J. Ries

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 2

POD after Venice … before Hobart

■POD plan was to be ready to start producing orbits with new standards by Fall 2006

“availability of ITRF2005 and time variable gravity model set the time table”

■ ITRF2005 arrived … with difficulties a lot of work went into its evaluation new issues were raised

■reprocessing of early cycles with GDR-b standards postponed the need for the “new” standards opens the possibility to revise choices made in Venice

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 3

Goals for Hobart POD/geoid splinter

■Evaluate quality of GDR-b orbits

■Evaluate impact of ITRF2005 and adopt it as is or with modifications

■Review recent progress in Gravity and Geoid models with a focus on Time Variable Gravity

■Review contribution of orbit to the overall error budget

■Collect inputs on the Jason-3 orbit choice issue from the POD point of view

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 4

Splinter schedule

■Two part splinter morning session during Splinter session 2

Wednesday morning from 9:30 to 12:30

afternoon session during Splinter session 3 Wednesday afternoon from 16:30 to 18:00 after poster session

■morning and afternoon sessions will be held in room TASMAN A

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 5

Morning session : POD

■ 09:30 - J.-P. Berthias - Introduction: Status of Pending Actions and Key Issues■ 09:45 - L. Cerri - Jason-1 POD Reprocessing at CNES: Current Status and Further

Developments■ 10:00 - L. Cerri, J.-P. Berthias – Time Variable Gravity : Implementation Issues for Jason 1■ 10:15 - W. Bertiger - Precision Orbit Determination, Trade Studies and Improvements for

Jason-1 with GPS■ 10:30 – Break■ 11:00 - F. Lemoine - Improvement of the Complete TOPEX and Jason Orbit Time Series:

Current Status■ 11:15 P. Bonnefond - Validation Activities for Jason-1 and Topex/Poseidon Precise Orbit■ 11:30 - J. Ries - Orbit Error Budget for Jason-1 and Topex/Poseidon Precision Orbits■ 11:45 - Ch. Foerste - On the use of Temporal Gravity Field Models Derived from GRACE

for Altimeter Satellite Orbit Determination■ 12:00 - P. Willis - Validation and Extension of ITRF2005 for DORIS POD■ 12:15 - J. Ries - Validation and Extension of ITRF2005 for SLR POD

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 6

Afternoon session : Geoid and discussion

■16:30 - Discussion on key POD Issues: ITRF2005 implementation, time variable gravity, other model recommendations

■17:00 - J. Ries GRACE Mission Status and Current Results■17:15 - R. Biancale EIGEN5 activities at GFZ and GRGS■17:30 - X. Deng Assessment of Geoid Models off Western Australia

Using Oceanographic In-Situ Measurements■17:45 - M.-H. Rio Ocean Mean Dynamic Topography from Altimetry and

GRACE: Toward a Realistic Estimation of the Error Field■17:55 - Discussion on remaining Geoid Issues■18:00 - Adjourn

Ocean Topography Science Team Meeting - Hobart, Australia – March 2007 7

POD/Geoid Posters

■ A 4-year Series of Earth Mass Changes derived from GRACE and LAGEOS dataR. Biancale, J.-M. Lemoine, S. Loyer;, S. Bruinsma, F. Perosanz, G. Balmino

■ Validation Activities for Jason-1 and Topex/Poseidon Precise OrbitsP. Bonnefond, P. Exertier, O. Laurain, P. Berio and D. Coulot

■ Evaluation of Orbits for the WATER Hydrosphere Mapper MissionD. Chambers, R. D. Ray, J. C. Ries

■ Toward EIGEN-05: Global Mean Gravity Field Models from Combination Of Satellite Mission and Altimetry/Gravimetry Surface DataC. Foerste, F. Flechtner, R. Schmidt, R. Koenig, Ul. Meyer, R. Stubenvoll, M. Rothacher, F.Barthelmes, H. Neumayer, R. Biancale, S. Bruinsma, J.-M. Lemoine, S. Loyer

■ New Mean Sea Surface DNSC07P. Knudsen, O. Andersen

■ Evaluation of the Geosat and Geosat Follow-On Precise Orbit EphemerisF. Lemoine, N.P. Zelensky, B.D. Beckley, D.S. Chinn, D.D. Rowlands, J.L. Lillibridge, R.Scharroo, W.H.F. Smith

■ Jason 1 GPS Processing at CNESF. Mercier, L. Cerri, S. Houry, P. Perrachon, J.-P. Berthias

■ Ocean Mean Dynamic Topography from altimetry and GRACE: toward a realistic estimation of the error fieldM.-H. Rio, P. Schaeffer,J.-M. Lemoine, G. Larnicol

■ Validation and Extension of ITRF2005 for DORIS and SLR POD (DPOD2005 and LDPOD2005)P. Willis, J.C. Ries, F.G. Lemoine, E.C. Pavlis, L. Soudarin, N. Zelensky