CNES Mission Center : SALP PRODUCTION STATUS

1. CNES Mission Center : SALP PRODUCTION STATUS

2. SALP operation center • Processing, archiving, validation and distribution of orbitography and altimeter data for : • Jason-1, T/P, ENVISAT, SPOTs satellites • Also use GFO data when available (facing several pbs late 2006 with battery management) as input of Duacs system • Preparation of Jason-2 ground processing center : • Definition of Jason-2 products content and ground processing chains (see Jason-2 presentation) • Studies ongoing to refine Jason-1/Jason-2 standards • Preparation of Alti-Ka ground processing center : • Definition of Alti-ka products content and ground processing chains (see Alti-ka presentation)

3. Jason-1 altimeter products • Shared processing effort : • OSDR and Reprocessed GDR at JSDS • IGDR and GDR at CNES • Dissemination : • OSDR+IGDR on anonymous ftp server or on user site for specific users • GDR on anonymous ftp server and DVD • Main 2006 milestones are : • Mission safehold (October, 30th to November 16th) • Routine production, validation and distribution to the user community : GDR_B up to cycle 185 (dated 2007-01-13 16:40:05 to 2007-01-23 14:38:36.)  Users have access to 5 years of Jason-1 GDR products (not yet homogeneous data set) • Implementation of new CMA ground processing configuration allowing much faster processing (and prerequisite for reprocessing) mid November 2006 • GDR_B : see next

4. Jason-1 GDR reprocessing • GDR_B was introduced late 2005, validated during last OSTST and in November 2006 the GDR status was • Cycles 1-21 : Version B GDRs (Jan 2002-Aug 2002) • Cycles 22-127 : Version A GDRs (Aug 2002-Jun 2005) • Cycles 128 onwards : Version B GDRs (Jun 2005) • This mix of data (Version A versus Version B products) results with discontinuities to the Jason-1 time impacting some user applications : • Following users requirement, it was decided to reprocess the whole set of Jason-1 GDR cycles in GDR_B • Start of GDR_B (cycles 22 – 127) reprocessing early December 2006 • In order to have the longest continuous Version B GDR time series available at the Hobart SWT meeting, reprocessing has started with data from 2005 (cycles 110-127), then 2004 (cycles 73-109), 2003 (cycles 36-73), and finally 2002 (cycles 22-35). • This reprocessing is performed by JSDS, SALP being involved in orbit and Mog2D computation, and cyclic validation and user dissemination • Currently cycles 67, 70, 73-77, 79-87, 92, and 95-127 have been reprocessed and delivered (about 50% completed) • We expect to complete this reprocessing in a few weeks.

5. IGDR processing • Interim Geophysical Data Record : • Keys inputs : Doris MOE file and Meteorological files (analyzed fields) • Requirement = IGDR shall be delivered within 3 to 5 days • IGDR processed on CNES side • In a nominal scenario, processing performed in less than 3 days : • processing of data dated J on day J+2 • ie data dated today March 12th will be processed on Wednesday • Verification step • production setup in follow if data quality meet requirements

6. IGDR production monitoring • Oct 30th Nov 16th : no IGDR production as a consequence of the platform incident

7. GDR processing • Geophysical Data Record : • Keys inputs : POE file • Processing requirement = GDR shall be delivered within 30 days and shall contain 95% of all possible over-ocean data during any 12 months period with no systematic gaps. • Fully validated product including a systematic analysis on CNES and JPL side before data release

8. GDR production monitoring

9. ENVISAT altimeter products • SALP involvement : • IGDR and GDR at CNES • Main 2006 milestones are : • A major instrumental anomaly impacted Ra2 data the USO anomaly in February 2006. • On May, 15th 2006, the instrument sub-system Radio Frequency Module (RFM) was switched to its B-side. Unfortunately, an anomaly occurred on the S-Band transmission power. • On June, 20th the RFM was then switched to its nominal configuration side (A-side). A ground segment correction was developed and implemented in August and allowed Envisat altimetric data to recover its nominal quality. • Ongoing study to generate IGDR in 2 days

10. ENVISAT IGDR products

11. ENVISAT GDR products

12. SALP/DUACS level3 products • SSALTO/Duacs system (Ssalto near real time multi-mission altimeter data processing system) • routine production : • No production delay in 2006 (production performed in less than 48 hours) • Impacted by satellites unavailabilities • Jason-1 SafeHold in November • ENVISAT safeholds, altimeter USO anomaly, ground processing issues • GFO undervoltage anomalies • 2006 evolutions : • Regional products capabilities set up in operations (Mersea, MFSSTEP) • Daily production (started on July, 1st) • 2007 evolutions : • NRT products (OSDR, FDGDR)

13. SALP/AVISO Data dissemination - User services • All dissemination (electronic and media) monitored. • More and more electronic dissemination (GDR routinely sent on media) • 145 new teams in 2006

14. Data use case on hydrology. Processing routine functions Visualisation functions SALP/AVISO Enhance service to end users : BRAT • BRAT toolbox developed by CLS under an ESA/CNES contract • In summary, this toolbox allows to : • handle several altimetry missions’ data products (level2 or higher coming from several data centers) • perform advanced data processing • visualize data. and include general tutorial and use cases.

15. CONCLUSION • SALP processing center has met all mission requirements • Reprocessing effort in GDR_B ongoing to fulfill user expectation • Jason-2 scientific algorithms needs to be frozen late 2007 and inline with Jason-1 : • OSTST should define the desired evolutions with regards to current Jason-1 standards (used as the baseline for ongoing Jason-2 development). • This will lead to GDR_C Jason-1 version and possible reprocessing using this new standard starting early 2008