SADE Export Web Site Claire Tinel Denis Blumstein

SADE Export Web Site Claire Tinel, Denis Blumstein, Patrice Henry - CNES Pascale Lafitte - CNES GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

Outline ■ CNES Calibration Methods ■ SADE Database ■ SADE Export Web Site GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

In-flight calibration of optical sensors using natural targets ■ Main calibration Methods w 5 calibration methods are routinely used to calibrate sensors Deserts Sun Glint Rayleigh Snow Clouds w These calibration methods are used operationally at CNES for POLDER 1, 2, 3 (PARASOL), VEGETATION 1 and 2, for SPOT satellites, MERIS, MODIS, FORMOSAT-2 and KOMPSAT-2 ■ + Calibration over equipped test sites ■ Coming soon : lunar calibration (Venµs and PLEIADES) (Tuz Golu Campaign) GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES (La Crau)

Multi-temporal Calibration methods ■ Deserts : cross and multi-temporal calibration w Comparison of measured reflectance with reference reflectance (same or other sensor) acquired in the same geometrical conditions ■ Sun glint calibration : interband calibration w Observe the white reflection of the sun over the ocean surface w Interband calibration w. r. t. a reference spectral band (620 nm) ■ Rayleigh calibration : absolute calibration of bands < 700 nm w Observe the atmosphere over ocean (dark) w Rayleigh scattering : > 80% of signal ■ Deep convective clouds : interband calibration w Observe the white reflection of the sun over clouds w Interband calibration w. r. t. a reference spectral band ■ Snow : multitemporal calibration and/or intersensor calibration w Observation of stable snowy sites at high altitude (3200 m) GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE: Structure d’Accueil de Données d’Etalonnage (Calibration Data Repository) ■ Multi-temporal calibration and cross-calibration and/or absolute calibration of optical sensors (visible → NIR) through different methods ■ Easy data management, link between satellite measurements and calibration results (traceability) ■ Common calibration tool for all sensors for one given method GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Base Content: ■ TOA reflectances ■ Calibration results (coefficients) ■ Synthesis results (means, models) MUSCLE Tools (Front-End Graphic) ■ Extraction and insertion of measurements ■ Calibration ■ Synthesis Exogen data (climatologic models 4/day ) ■ NCEP : pressure, water vapour ■ EPTOMS : ozone GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Exogen data GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE For each measurement: ■ Mean TOA reflectance value + standard deviation per band ■ Geometrical conditions : zenithal and azimuthal viewing/solar angles ■ Pressure, water vapour, ozone, aerosols optical depth ■ Product name N 1, Acquisition date ■ SADE identifier For each "elementary " calibration result: ■ One calibration coefficient per band ■ Name of the method ■ Tool name, tool version and tool parameters ■ Processing date ■ User name ■ SADE identifier GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data ■ Systematic collect of satellite acquisitions on desertic sites : w 3 000 data ~ 10 % of SADE content ■ Operational monitoring of CNES sensors calibration (on a monthly basis) : w w w SPOT(s)/High Resolution SPOT(s)/Vegetation-1&2 PARASOL ■ Calibration monitoring and intercalibration of other sensors on a regular basis (through cooperation agreements with other space agencies) w w High resolution : Formosat-2 (Taiwan NSPO), Kompsat-2 (South Korea KARI) Coarse resolution : MERIS (ESA), MODIS/AQUA GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data ■ 20 sites selected over North Africa and Arabia GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data ■ Desert Sites Database (from 1985 until 2010) AVHRR POLDER SPOT MERIS MODIS GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data SADE Export web site (currently under development): - Provides TOA calibrated reflectances on desertic sites for the GSICS community - Access with a login user - Updating every 6 months Still remains to do: - Synthesis table - Sensors description - GSICS community opening : March 2010 Desert SADE Data Access GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES