AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets.

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Presentation transcript:

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets Dave Smith - Rutherford Appleton Laboratory

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Objectives Use remote desert sites to verify calibrations of AATSR and MERIS by comparison with other instruments (in particular ATSR-2), and in-situ radiometer measurements. Long-term stability of sites will enable temporal calibration drifts to be determined. Results can be extended to improve the calibrations of other instruments such as SCIAMACHY and AVHRR. Crucial to blending of records of geophysical parameters derived from different sensors.

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Desert Calibration Targets Sonora - Mexico Sudan - Egypt

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 ‘CNES’ Sites

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Other Sites

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Analysis Method

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Orbit 2136 comparison (MERIS/AATSR)

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 ATSR-MERIS Comparisons AATSR MERIS AATSR MERIS AATSR MERIS 870 nm

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Orbit 2136 comparison (AATSR/ATSR-2) ATSR-2 870nm AATSR 870nm

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 AATSR Data Processed to Date NOTE: Data before October 1 st not used for validation

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Example ‘cloud’ test result Sonora, Mexico

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 METRIC Extractions METRIC tar files downloaded from MERIS Calibration Site (370 files to date) No METRIC outputs for SONORA, Dunhuang, Hay, Amburla and Thangoo HDF Files extracted from tar files and read by IDL routine TOA reflectances extracted and stored in file for each site Coincident MERIS and AATSR observations compared (11 match-ups so far) How do METRIC cloud test results compare with AATSR?

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 MERIS/AATSR Comparison 560nm R AATSR /R MERIS = nm R AATSR /R MERIS = nm R AATSR /R MERIS = 1.037

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 ATSR-2 Desert Reflectances Use archive of ATSR-2 TOA Reflectances from 1995 to 2000

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 AATSR/ATSR-2 Indirect comparisons R AATSR /R ATSR-2 =1.088 R AATSR /R ATSR-2 = R AATSR /R ATSR-2 = R AATSR /R ATSR-2 =1.132

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 AATSR vs. ATSR-2 Coincident Data

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Summary of Previous ATSR-2 Intercomparisons

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Summary of results obtained so far First TOA reflectance extractions performed for selection of Desert targets for October AATSR agrees well with MERIS R AATSR /R MERIS = (560nm), (660nm), (870nm) Significant differences observed between AATSR/MERIS and ATSR-2 R AATSR /R ATSR (560nm), (660nm), (870nm), (1600nm) Results consistent with other investigations (Haggolle, Govaerts)

AATSR Calibration Using DesertsENVISAT Validation Review 9-13 December 2002 Remaining activities Process remaining sites and coincident ATSR-2 data MERIS/METRIC products for Sonora, Hay, Amburla, Thangoo and Dunhuang Greenland Data – need data for period between May and August. Atmospheric corrections Walk through from raw data to calibrated radiances – identify possible processing errors Long Term analysis – –Requires data products delivered on a regular (monthly) basis – preferably on CD-ROM rather than FTP site