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Gothenburg 16-20 October, 2000
MERIS
Validation of MERIS Products
Jean-Paul Huot, Carsten Brockmann
Peter Regner, Phillipe Goryl
Steven Delwart, Mike Rast
ERS - ENVISAT SYMPOSIUM
Gothenburg 16-20 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
ERS - ENVISAT SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 16-20 October, 2000
MERIS
L2 Verification General Strategy
ERS - ENVISAT SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 16-20 October, 2000
MERIS
MARINE PRODUCTS: 12 PROPOSALS
LAND PRODUCTS: 4 PROPOSALS
CLOUD AND WATER VAPOUR PRODUCTS: 3 PROPOSALS
Overview
ERS - ENVISAT SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 16-20 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
ERS - ENVISAT SYMPOSIUM
Gothenburg 16-20 October, 2000
MERIS
Marine Products
ERS - ENVISAT SYMPOSIUM
Gothenburg 16-20 October, 2000
MERIS
ERS - ENVISAT SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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 SYMPOSIUM
Gothenburg 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
Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry