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F-PAC validation context

• CMA chain has to be inline with the algorithms approved by ESA and used for the prototype development

• CLS Prototype validated :– using Test Data Sets based on ERS-2 and T/P data

– with real Envisat data :• header part

• all fields in the data set records

• CalVal analysis

– --> Validation OK

• CMA validated with respect to the prototype outputs– some known anomalies

– some known discrepancies agreed with ESA

– --> Validation OK, further validation handled by the CalVal team

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F-Pac known “issues”• None on the POE processing

• Request for waivers on the CMA chain :– No Bent correction (agreed with ESA)

– specific DEM used for bathymetry/elevation determination (agreed with ESA)

– default strategy for ice1&sea-ice parameters

• Issues :– position in the header part but the Product Spec state:

• The Orbit State Vector (OSV) corresponds to the Ascending Node crossing if the OSV is generated from the DORIS Navigator Level 0 product (DOR_NAV_OP), or from the FOS Predicted Orbit (AUX_FPO_AX). The OSV corresponds to sensing start time of the product if the OSV is generated from the DORIS preliminary product (DOR_POR_2P), DORIS precision product (DOR_VOR_2P), or from the FOS Restituted Orbit (AUX_FRO_AX).

– duplicated products

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F-Pac known “issues”

• Current anomalies on the CMA chain : – some level2 records filled with Nan values

– wrong method used for the atmospheric attenuation (used of the sigma0_S value instead of the Ku one)

• --> impacts the sigma0 and so the wind and the SSB (so the SLA)

– radiometer interpolation method different from the reference prototype • --> impacts the radiometer parameter close to land

– MCD fields / prototype values in particular for the ice1 and sea-ice values

– Doris ionospheric chain has to be tuned

– Pass number used instead of the Orbit Number in the header part

– tide management (long period term)

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“Known limitation”

• On the Aux data files :– SSB table used is the ERS2 Ku band table on both Ku and S band -->

impacts the dual frequency ionospheric correction

– rain flag : • table estimated for the S band

• and cloud liquid water content biased

– GSFC00.1 MSS used (limited in latitude bandwidth)

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Data validation

• IGDR daily validation by Xover and statistic analysis

• GDR cycle basis validation – ocean retracking

•

– ice retrackings

– Multi-mission data quality (Envisat/ERS-2/Jason-1)

• Long term validation– annual report for the above tasks

Document AcrobatCycle 11 validation report