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The ESA CoSMOS study for the validation of the SMOS L2
prototype
K Saleh Contell, Y. Kerr, MJ Escorihuela, G. Boulet, P. Maisongrande, P. de Rosnay, JP Wigneron, A Cano, E Lopez-Baeza, JP Grant, J Balling, N Skou, M Berger, S Delwart, P Wursteisen
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OUTLINE
1. Presentation of the CoSMOS study
2. Overview of the ESA CoSMOS campaign
3. Data processing for validation of the SMOS SM L2 prototype
4. Ongoing studies
5. Conclusion
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3
FIRST EVALUATION OF THE
SMOS SM LEVEL 2 (L2)ALGORITHM USING
REAL DATAFINE TUNE MODELLING
OF MICROWAVEMODEL L-MEB
PERFORMANCE OF THESMOS L2
‘DEFAULT MODEL’?
‘OPPORTUNITY STUDIES’
(e.g. land sun-glint, fully polarimetric data,
sensor intercomp.)
1/ Presentation of the CoSMOS study
SENSITIVITY OF RETRIEVALS TO INPUT
SURFACE DATA?(e.g. surface T, …)
Objectives
4
ESACoSMOS CampaignEMIRAD L-BAND
RADIOMETER
1/ Presentation of the CoSMOS studyData sets 2005
NAFE-05PLMR L-BAND RADIOMETER
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1/ Presentation of the CoSMOS study
Schedule2007|2008
WP number and title J F M A M J J A S O N D J F M A M J J A S O N D
WP1000 Project management
WP2000Literature review
WP3100 Data acquisition
WP3200 Data processing
WP4000 Algorithm implementation and validation
WP5000 Analysis of NAFE-05 PLMR
WP6100 Conclusions and recommendations (1)
WP6200 Conclusions and recommendations (2)
SMOS launch
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2/ Overview of the CoSMOS Campaign
ESA flights
EMIRAD POLARIMETRIC RADIOMETER (TUD) onboard Aero Commander 500S
Nadir~ 40 deg
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2/ Overview of the CoSMOS Campaign
ESA flights
FLIGHT TYPE NADIR OFF-NADIR
‘REGULAR’ 375 m x 375 m 540 m x 392 m
‘WATER’ 305 m x 305 m 440 m x 320 m
SCALING 1290 m x 1290 m(up to)
1870 m x 1360 m
‘SUN-GLINT’ dives
‘CALIBRATION’ 120 m x 120 m 300 m x 200 m
calibration
NR OF DAYS
8 (~ 10 h)
2 (~ 6 h)
3 (10 h)
1
12
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2/ Overview of the CoSMOS Campaign14/11 15/11 17/11
20/11 21/11 22/11 23/11
27/11 29/1103/12 09/12
scaling
scaling
rainfall
rainfall
/sun glint
regular
regular
regular
regular regular regular
regular
water
water
/ scaling
[K]
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2/ Overview of the CoSMOS Campaign
PLMR: (M) multiple resolution, (R) regional, () multi-angular, (D) dew
2-week overlap shown: 17 EMIRAD/PLMR flights on same farm/day
2/ Overview of the CoSMOS Campaign
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EMIRADnadir
off-nadir
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nadir
off-nadir
a) Rather stable TB measurements across the farm, specially for dry soil
b) TB Response to soil moisture changes
TB~ 40 K at nadir for grassTB~ 30 K at nadir for crops
c) ‘Wet soil signature’ after rain (low litter content in farms)
2/ Overview of the CoSMOS Campaign
EMIRAD
1Antenna gainprojected on the surface f(aircraft attitude,antenna orientation,gain pattern,topography)
2Grid of normalised gains
c c cg g g gg g g gg g g g
cff
3Modelled TB
(e.g. crop,grass,forest)
5Comparison to measured TB
4Transportation of simulation of
TB from surface to antenna
3/ Data processing for validation of the L2 processor
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3/ Data processing for validation of the L2 processor
1 2
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3/ Data processing for validation of the L2 processor
Griddedgain
FNO FNO FNO
FNO FNO FNO FNO
FNO FNO FNO FNO
FNO FNO FNO FNO
FNO
FFO
FFO
GriddedLand uses
GriddedSurface datae.g. SM’
c c cg g g gg g g gg g g g
cff
‘L-MEB param. grid’
3
SMOS Breadboards
Modelled TB at the antenna level
‘Incidence angle grid’
ALL GRIDS
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4/ Ongoing studies for validation of the L2 algorithm
L2 VALIDATION FOR
HOMOGENEOUSSURFACES
VALIDATIONGRASS/CROPSMICROWAVE
MODEL
LITTER ANDINTERCEPTION
VALIDATION SOIL MICROWAVE
MODEL
FOREST MICROWAVE
MODEL
GROUP OF STUDIES 1
USES L-BAND DATA UNDER 1 KM
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4/ Ongoing studies for validation of the L2 algorithm
VALIDATIONL2
HETEROGENEOUSSURFACES
SM RETRIEVALSIN MIXED PIXELS
‘NOMINAL’ + ‘FOREST’(SM retrieved in thenominal part only)
SM RETRIEVALSIN MIXED PIXELS
‘NOMINAL’ + ‘NOMINAL’
GROUP OF STUDIES 2
USES L-BAND DATA UNDER 1 KM
16
wheat grass
SM?
forest grass
SM?
4/ Ongoing studies for validation of the L2 algorithm
VALIDATIONOF
LOW-RESSM
SM VALIDATIONFROM L2 RETRIEVALSAT THE SMOS SCALE
SM RETRIEVALS AT 1 KM FROM
L2 AGGREGATED TBs
GROUP OF STUDIES 3
17
USES LOW-RESL-BAND DATA
SM? SM?
4/ Ongoing studies for validation of the L2 algorithm
‘OPPORTUNITYSTUDIES’
USE OF FULLY POLARIMETRICL-BAND DATA
QUANTIFICATIONOF SUN-GLINT REFLECTIONOVER LAND
GROUP OF STUDIES 4
TOPOGRAPHYEFFECTS
COMPARISONPLMR-EMIRAD
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5/ Conclusion
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i) CoSMOS-NAFE Campaign provided a Great ‘Outdoors lab’ for SMOS Level 2 Implementation/Validation
ii) Expected outputs:i) Assessment of the ‘default’ Level 2 algorithmii) Recommendations for algorithm improvement iii) Recommendations for future Cal/Val campaigns during the
SMOS commissioning phase
ii) For some preliminary results / project documents :
-Saleh K et al., The CoSMOS L-band experiment in Southeast Australia, Proceeding of International Geoscience and Remote Sensing Symposium (IGARSS), Barcelona, Spain, 23 - 27 July, 2007. -Please contact [email protected]
