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ERS - ENVISAT SYMPOSIUM Gothenburg 16-20 October, 2000 MERIS Validation of MERIS Products Jean-Paul Huot, Carsten Brockmann Peter Regner, Phillipe Goryl.

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Presentation on theme: "ERS - ENVISAT SYMPOSIUM Gothenburg 16-20 October, 2000 MERIS Validation of MERIS Products Jean-Paul Huot, Carsten Brockmann Peter Regner, Phillipe Goryl."— Presentation transcript:

1 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS Validation of MERIS Products Jean-Paul Huot, Carsten Brockmann Peter Regner, Phillipe Goryl Steven Delwart, Mike Rast

2 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS Responsibilities MERIS & AATSR VALIDATION TEAM (MAVT) Coordinator : E. Attema VEGETATION PRODUCTS & ATMOSPHERIC CORRECTIONS OVER LAND M. Rast L2 ALGORITHM VERIFICATION C. Brockmann CLOUDS & WATER VAPOUR PRODUCTS P. Goryl WATER PRODUCTS VALIDATION JP Huot

3 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS Level 2 Verification Objectives correct formatting algorithm correct surface classification products being in the expected range products in accordance with common rules no visual artefacts meaningful product confidence flags

4 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS L2 Verification General Strategy

5 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS BASED ON PROPOSALS IN ANSWER TO AO PRIVILEGE: EARLY ACCES TO MERIS PRODUCTS RESPONSABILITIES: GATHERING OF VALIDATION DATA CRITICAL REVIEW OF PRODUCTS Geophysical Validation

6 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS LAUNCH+/- 6 WEEKS: INTERCALIBRATION EXERCISE LAUNCH + 6 WEEKS: GATHERING OF VALIDATION DATA BEGINS LAUNCH + 3 MONTHS: RELEASE OF LEVEL 1B TO VALIDATION TEAMS LAUNCH MONTHS: RELEASE OF LEVEL2 TO VALIDATION TEAMS LAUNCH + 6 MONTHS: RELEASE OF ALL PRODUCTS TO SCIENCE TEAMS Schedule

7 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS MARINE PRODUCTS: 12 PROPOSALS LAND PRODUCTS: 4 PROPOSALS CLOUD AND WATER VAPOUR PRODUCTS: 3 PROPOSALS Overview

8 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS ALGAL PIGMENT ** YELLOW SUBSTANCE ** SUSPENDED MATTER ** AEROSOL OPTICAL THICKNESS * AEROSOL SPECTRAL DEPENDANCE * FLAGS ** WATER-LEAVING REFLECTANCES * * REFERENCE MODEL EXISTS ** REFERENCE MODEL AND MEASUREMENT PROTOCOLS EXIST Marine Products

9 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS INTERCALIBRATION OF OPTICAL SENSORS INTERVALIDATION OF MEASUREMENT METHODS. THE INVESTIGATORS AGREE TO TAKE PART IN AGREE TO FOLLOW MEASUREMENT PROTOCOLS REFERENCE MODEL Marine Products

10 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS Marine Products

11 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS

12 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS VALIDABLE PRODUCTS: SURFACE PRESSURE DDV FLAG AEROSOL OPTICAL THICKNESS ABOVE DDV AEROSOL SPECTRAL SLOPE ABOVE DDV Land Products

13 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS VALIDATION OF SURFACE PRESSURE: Pressure algorithm uses ratio of radiance in O2 absorption band at 760 nm and reference at nm => sensitivity to spectral registration VALIDATION ABOVE BRIGHT DESERT SITES WITH KNOWN SURFACE PRESSURE Land Products

14 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS VALIDATION OF AEROSOL PROPERTIES: Use data from AERONET network and from SCHIAMACHY VALIDATION OF DDV CLASSIFICATION: Stability of statistics of DDV patches with variation of ARVI threshold Land Products

15 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS WATER VAPOUR OVER WATER: MWR on board ENVISAT WATER VAPOUR OVER LAND AND CLOUDS: GPS, radiosoundings Water Vapour Products

16 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS CLOUD OPTICAL THICKNESS: Validate radiative transfer code using : Measurement from aircraft of top-of-cloud radiances with CASI with MERIS band configuration. Measurement of in-situ cloud droplet sizes and concentrations using in-cloud flying aircraft Cloud Products

17 ERS - ENVISAT SYMPOSIUM Gothenburg October, 2000 MERIS CLOUD TOP PRESSURE Dedicated MERIS campaigns with reference bands outside O2 absorption bands ( nm, 775 nm) and three 2.5 nm-wide channels at 760, 762.5, 765 nm. Dedicated aircraft flights with OVID spectrometer and CASI imaging spectrometer. Cloud Products


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