Multi-sensors vicarious calibration activities at CNES
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1 Multi-sensors vicarious calibration activities at CNES Patrice Henry, Bertrand Fougnie June 11, 2013
2 CNES background in image quality monitoring of operational Earth observation systems Since the launch of SPOT1 in 1986, CNES has cumulated more than 110 years of in-orbit image quality monitoring SPOT1, SPOT2, SPOT3, SPOT4, SPOT5 (HR) VGT 1 & 2 POLDER 1&2, PARASOL Scarab 1&2, Scarab MT Calipso/IIR Helios series Pleiades 1A&1B Different resolution, different types of mission, different thematic Different skills to develop (geometry, radiometry, MTF, polarized geometry ) Different tools (as generic as possible) Different types of users to satisfied
3 CNES background in radiometric calibration activity CNES has developed different calibration methods over natural targets for visible and NIR optical sensors Rayleigh scattering over ocean Sun glint over ocean Deep convective clouds (DCC) Stable African deserts Antarctica (Dome C area) Lunar calibration Autonomous calibration station (for high resolution) Most of them are used on an operational basis Monitoring the CNES sensors calibration (SPOT(s), VGT(s), POLDER(s), Pleiades(s) ) Monitoring of other agencies sensors (MERIS, MODIS, SeaWiFS, AVHRR, Formosat2, Kompsat2, Theos )
4 Summary Example of VGT calibration Summary Example of PARASOL calibration Example of MERIS The CNES Calibration Toolbox Conclusion 4
5 Example of SPOT/VEGETATION calibration
6 VGT On-Board Calibration Device Simultaneous lighting of the 4 cameras by means of a lamp device mounted on a rotating fiber bar : only 100 detectors are simultaneously lighted calibration duration: about 3 min.
7 VGT Routine Calibration Monitoring using On-Board Lamp On-board calibration device proved to be efficient for the VGT1 calibration monitoring (6 years) thanks to regular comparison to vicarious calibrations No anomaly detected during VGT2 commissioning period (6 months): some discrepancies with vicarious calibration but in the order of magnitude of the methods accuracy Decision was made to base VGT2 operational calibration monitoring on the on-board lamp measurement for the operational phase
8 VGT 2 calibration check over deserts (B2 band) VGT2 calibration monitoring over deserts versus different references (POLDER2, POLDER3, VGT1) compared to calibration monitored with the on-board lamp after 3 years in orbit
9 VGT 2 calibration error confirmed by different methods VGT2 calibration error as seen by deserts inter-calibrations (normalization 1st July 2002) VGT2 calibration error as seen by Rayleigh scattering calibration Sentinel-3 calibration and Validation Planning (normalization Meeting 1st July 2002)
10 Urgent to change the operational calibration monitoring procedure!!! Switch to an operational calibration monitoring over desert sites (VGT = land monitoring mission)
11 VGT 2 calibration monitoring over deserts : month averaging 0,98 VGT2/B2 calibration model fit in June ,96 0,94 0,92 A VGT2 / A VGT1 0,90 0,88 0,86 0,84 0,82 mai-02 nov.-02 mai-03 nov.-03 mai-04 nov.-04 mai-05 nov.-05 mai-06 month average
12 VGT 2 calibration monitoring over deserts : model fitting 0,98 VGT2/B2 calibration model fit in June ,96 0,94 0,92 A VGT2 / A VGT1 0,90 0,88 0,86 0,84 0,82 mai-02 nov.-02 mai-03 nov.-03 mai-04 nov.-04 mai-05 nov.-05 mai-06 month average cal. june06
13 VGT 2 calibration monitoring over deserts : monthly fit 0,98 VGT2/B2 calibration model comparison over 1 year 0,96 0,94 0,92 A VGT2 / A VGT1 0,90 0,88 0,86 0,84 0,82 mai-02 nov.-02 mai-03 nov.-03 mai-04 nov.-04 mai-05 nov.-05 mai-06 month average cal. june05 cal. aug05 cal. oct05 cal. dec05 cal. feb06 cal. apr06 cal. june06
14 VGT 2 calibration monitoring over deserts : seasonal effects 0,98 VGT2/B2 calibration month by month model results 0,96 0,94 0,92 A VGT2 / A VGT1 0,90 0,88 0,86 0,84 0,82 mai-02 nov.-02 mai-03 nov.-03 mai-04 nov.-04 mai-05 nov.-05 mai-06 month average cal. month by month
15 VGT 2 calibration monitoring over deserts : final result VGT2/B2 'new' official calibration 3,750 3,715 3,680 3,645 3,610 3,575 3,540 3,505 3,470 3,435 3,400 3,365 3,330 3,295 3,260 3,225 3,190 mai-02 nov.-02 mai-03 nov.-03 mai-04 nov.-04 mai-05 nov.-05 mai-06 Off. calibration Deserts calibration Rayleigh calibration
16 Validation of VGT2 new calibration over Dôme C Purple: lamp calibration +7 B0 B Blue : ground calibration (constant) B3 Yellow: deserts calibration New calibration error : < 1% over 3 years
17 VGT1 lamp calibration validation over Dôme C B0 B2 Blue : ground calibration (constant) Purple: lamp calibration B3 Calibration error : < 2% over 6 years
18 Operational calibration monitoring procedure (performed on a monthly basis)
19 But calibration shall not be resumed to a single value!
20 B0 VGT2 Rayleigh Scattering (spring 2007) against viewing zenith angle against measured radiance against wave angle against water leaving radiance
21 B0 VGT2 Rayleigh Scattering after correction
22 Other vicarious calibration methods used for VGT calibration validation
23 VGT2 calibration validation over clouds (spring 2007) Interband calibration B3 vs B2
24 VGT2 calibration validation over sun glint (summer 2007) Interband calibration B3 vs B2
25 Example of PARASOL/POLDER-3 calibration
26 PARASOL/POLDER-3 presentation POLDER instrument is a camera composed of: - a two-dimensional CCD detector array, - a wide field of view telecentric optics, - a rotating wheel carrying spectral and polarized filters. No on-board calibration device End of life of PARASOL scheduled in Sept Complete reprocessing of the full archive ( ) Level 1 and level 2 Great interest for an a posteriori recalibration
27 PARASOL operational calibration monitoring over DCC Monthly average of DCC calibration results Calibration coefficients delivered every month (extrapolated linear fit)
28 A post mortem physical calibration model A simple physical model (simplified Barnes model ) Time constant: D k (ageing contributor) Amplitude: B k A k ( t) Ak ( to).1 Bk.(1 exp( Dk.[ t to ]) D k identical for all bands Single camera D = day -1 B k ajusted for each band g Model extended to relative calibration coefficients ( t) glpk ( t0) 1 lpk.(1 exp( D.[ t t0])) lpk
29 PARASOL - Validation of trending using various methods b) 670 nm band Rayleigh Sunglint Clouds Desert Antarctica Ak Jan-05 Jul-05 Jan-06 Jul-06 Jan-07 Jul-07 Jan-08 Jul-08 Dec-08 Date
30 Relative calibration correction Relative calibration in the field of view» Combination of different calibration methods Clouds Interband calibration 490nm calibration as a function of the CCD matrix line Rayleigh Absolute calibration Desert Cross calibration CCD line
31 2D visualization of relative calibration discrepancies Variable ageing in the field of view Continuous drift Detected with different methods (DCC, deserts, Rayleigh) Not yet corrected in level 1 product Easy to identify, but more difficult to correct fine estimation and modeling March nm band March 2006 March 2008 March 2010 March 2005 March 2007 March 2009
32 Relative calibration for the different bands Spectral behaviour of the variable 2D ageing - DCC calibration: averaging 3 month in nm March 2011
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