GPRC CNES Report CNES Activities in the Framework

GPRC CNES Report CNES Activities in the Framework of GSICS Bertrand Fougnie, Patrice Henry, Sophie Lachérade, Denis Jouglet, Eric Péquignot + Support from CNES-DCT/ME GSICS – March 2012 - Beijing /

Global Overview of Activites ■ Cross-calibration over Desert + Antarctica w Cross-calibration LEO/GEO report Submitted paper w Assessment of error due to spectral interpolation Submitted paper w Sites analysis using ‘standard’ CNES tools dedicated talk · BRDF analysis of desert and Dome sites · Acquisitions using Pleiades w Development of a cross-calibration over Antarctica (similar to desert) ■ Calibration over Moon dedicated talk w Starting activity · Intensive acquisitions with Pleiades ■ Calibration over Rayleigh Scattering dedicated talk w Improvement of climatology w Assessment of the error budget · Efforts in last months and on-going analysis ■ IASI cross-calibration dedicated talk w Operational for IASI/AIRS, under development for IASI-B, expected for IASI/CRIS w Overview Cal/Val plans for Metop-B/IASI ■ SADE Database opening w Some delays and improvements GSICS – March 2012 - Beijing 2

GEO/LEO Sensors Cross-Calibration Over Desert Sites Bertrand Fougnie and Patrice Henry Centre national d’Etudes Spatiales CNES, Toulouse, France GSICS – March 2012 - Beijing 3

Summary 1/ Cross-calibration over desert sites = operational method for LEO • still improving method • updated results : VGT, MODIS, PARASOL, MERIS… • uncertainty assessment • selection of the best reference sensor (in term of method uncertainty) • operational environment SADE database (+ Muscle tools) 2/ GEO data (SEVIRI) = new type of data • construction of efficient cloud mask and selection (consistency with LEO) • insertion into SADE 3/ Cross-calibration LEO/GEO • same operational method • will probably need some optimization (geometrical coupling) GSICS – March 2012 - Beijing 4

Cross-calibration of LEO 1/ Cross-calibration over desert sites : Algeria-5 GSICS – March 2012 - Beijing Algeria-2 Libya-3 Libya-4 From Lachérade et al. , IEEE TGARS Inter-calibration special issue, submitted 5

Cross-calibration of LEO 1/ Cross-calibration principle : The loop GSICS – March 2012 - Beijing From Lachérade et al. , IEEE TGARS Inter-calibration special issue, submitted 6

Cross-calibration of LEO 1/ Cross-calibration aspects : 2 main steps Geometrical coupling MERIS MODIS VGT PARASOL GSICS – March 2012 - Beijing Spectral interpolation See also Henry et al. , IEEE TGARS Intercalibration special issue, submitted From Lachérade et al. , IEEE TGARS Inter-calibration special issue, submitted 7

Cross-calibration of LEO 1/ Results LEO: MODIS calibration GSICS – March 2012 - Beijing MERIS calibration Results from Lachérade et al. , IEEE TGARS Inter-calibration special issue, submitted 8

Cross-calibration of GEO 2/ Results …toward GEO: SEVIRI bands similar to VGT bands Errors due to spectral interpolation or reference sensor addressed in Henry, Chander, Fougnie, and Xiong, IEEE TGARS Inter-calibration special issue, submitted VGT calibration Consistency within 1. 5% (2% for blue) between MODIS reference and MERIS reference GSICS – March 2012 - Beijing From Lachérade et al. , IEEE TGARS Inter-calibration special issue, submitted 9

Cross-calibration of LEO 2/ Selection of GEO acquisitions : • cloud mask step in order to compute mean reflectance over site • alternative use of TIR bands or daily analysis (from Govaerts and Clerici 2004) • preliminary results show a very good efficiency using VIS+TIR bands • TBC and to be finalized… Daily SEVIRI data Filtering Courtesy D. Jolivet (HYGEOS, France) GSICS – March 2012 - Beijing 10

SADE Database GSICS – March 2012 - Beijing 11

SADE opening to GSICS and CEOS ■ Few feedbacks from beta-users : only one (very positive…) ■ SADE access through CNES scientific mission website w http: //smsc. cnes. fr/CALIBRATION/ (free access) w Password mandatory (for the “SADE data” page only) ■ No procedure yet available for password delivery (contact Aimé Meygret or Patrice Henry) ■ A complete reprocessing of SADE exported files is ongoing in March 2012 w Data extension up to 2011 w New sensors : · Terra/Modis · Landsat 7 · Theos w New MERIS reprocessing (3 rd) w VGT 1 updated calibration ■ Opening will be announced at the next CEOS/IVOS Meeting (May 2012) GSICS – March 2012 - Beijing 12

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Link to web pages GSICS – March 2012 - Beijing 14

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Archive through site identification GSICS – March 2012 - Beijing Archive through sensor identification 17

Libya-4 PARASOL Archive 07/2005 to 12/2005 GSICS – March 2012 - Beijing 18