inter comparisons of aatsr meris and atsr 2 calibrations using desert targets
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Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets. Dave Smith - Rutherford Appleton Laboratory. Objectives.

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inter comparisons of aatsr meris and atsr 2 calibrations using desert targets

Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets

Dave Smith - Rutherford Appleton Laboratory

objectives
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.
desert calibration targets
Desert Calibration Targets

Sudan - Egypt

Sonora - Mexico

atsr meris comparisons
AATSR

AATSR

AATSR

MERIS

MERIS

MERIS

870 nm

ATSR-MERIS Comparisons
aatsr data processed to date
AATSR Data Processed to Date

NOTE: Data before October 1st not used for validation

metric extractions
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?
meris aatsr comparison
MERIS/AATSR Comparison

560nm

RAATSR/RMERIS = 1.041

660nm

RAATSR/RMERIS = 1.001

870nm

RAATSR/RMERIS = 1.037

atsr 2 desert reflectances
ATSR-2 Desert Reflectances

Use archive of ATSR-2

TOA Reflectances

from 1995 to 2000

aatsr atsr 2 indirect comparisons
AATSR/ATSR-2 Indirect comparisons

RAATSR/RATSR-2 =0.945

RAATSR/RATSR-2 =1.081

RAATSR/RATSR-2 =1.132

RAATSR/RATSR-2=1.088

summary of results obtained so far
Summary of results obtained so far
  • First TOA reflectance extractions performed for selection of Desert targets for October 2002.
  • AATSR agrees well with MERIS

RAATSR/RMERIS =

1.041 (560nm), 1.001 (660nm), 1.037 (870nm)

  • Significant differences observed between AATSR/MERIS and ATSR-2

RAATSR/RATSR-2

1.132 (560nm), 1.088 (660nm), 1.081 (870nm), 0.945 (1600nm)

  • Results consistent with other investigations (Haggolle, Govaerts)
remaining activities
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
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