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

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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


Orbit 2136 comparison meris aatsr

Orbit 2136 comparison (MERIS/AATSR)


Atsr meris comparisons

AATSR

AATSR

AATSR

MERIS

MERIS

MERIS

870 nm

ATSR-MERIS Comparisons


Orbit 2136 comparison aatsr atsr 2

Orbit 2136 comparison (AATSR/ATSR-2)

ATSR-2

870nm

AATSR

870nm


Aatsr data processed to date

AATSR Data Processed to Date

NOTE: Data before October 1st not used for validation


Example cloud test result

Example ‘cloud’ test result

Sonora, Mexico


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


Aatsr vs atsr 2 coincident data

AATSR vs. ATSR-2 Coincident Data


Summary of previous atsr 2 intercomparisons

Summary of Previous ATSR-2 Intercomparisons


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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