ers - envisat symposium gothenburg 16-20 october, 2000 meris validation of meris products jean-paul...
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ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
Validation of MERIS Products
Jean-Paul Huot, Carsten Brockmann
Peter Regner, Phillipe Goryl
Steven Delwart, Mike Rast
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
Responsibilities
MERIS & AATSR VALIDATION TEAM (MAVT)
Coordinator : E. Attema
VEGETATION PRODUCTS &ATMOSPHERIC CORRECTIONS OVER LAND
M. Rast
L2 ALGORITHM VERIFICATIONC. Brockmann
CLOUDS & WATER VAPOUR PRODUCTSP. Goryl
WATER PRODUCTS VALIDATIONJP Huot
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
L2 Verification General Strategy
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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 + 4.5 MONTHS: RELEASE OF LEVEL2 TO VALIDATION TEAMS
LAUNCH + 6 MONTHS: RELEASE OF ALL PRODUCTS TO SCIENCE TEAMS
Schedule
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
MARINE PRODUCTS: 12 PROPOSALS
LAND PRODUCTS: 4 PROPOSALS
CLOUD AND WATER VAPOUR PRODUCTS: 3 PROPOSALS
Overview
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
INTERCALIBRATION OF OPTICAL SENSORS INTERVALIDATION OF MEASUREMENT METHODS.
THE INVESTIGATORS
AGREE TO TAKE PART IN
AGREE TO FOLLOW
MEASUREMENT PROTOCOLSREFERENCE MODEL
Marine Products
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
Marine Products
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
VALIDABLE PRODUCTS:
SURFACE PRESSURE
DDV FLAG
AEROSOL OPTICAL THICKNESS ABOVE DDV
AEROSOL SPECTRAL SLOPE ABOVE DDV
Land Products
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
VALIDATION OF SURFACE PRESSURE:
Pressure algorithm uses ratio of radiance in O2 absorption band at 760 nm and reference at 753.75 nm => sensitivity to spectral registration
VALIDATION ABOVE BRIGHT DESERT SITES WITH KNOWN SURFACE PRESSURE
Land Products
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
WATER VAPOUR OVER WATER:
MWR on board ENVISAT
WATER VAPOUR OVER LAND AND CLOUDS:
GPS, radiosoundings
Water Vapour Products
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 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
ERS - ENVISAT SYMPOSIUMGothenburg 16-20 October, 2000
MERIS
CLOUD TOP PRESSURE
Dedicated MERIS campaigns with reference bands outside O2 absorption bands (753.75 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