Inter comparisons of aatsr meris and atsr 2 calibrations using desert targets
Download
1 / 16

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


  • 97 Views
  • Uploaded on

Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets. Dave Smith - Rutherford Appleton Laboratory. Objectives.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Inter-Comparisons of AATSR, MERIS and ATSR-2 Calibrations using Desert Targets' - langer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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 using Desert Targets

  • 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 using Desert Targets

Sudan - Egypt

Sonora - Mexico



Atsr meris comparisons

AATSR using Desert Targets

AATSR

AATSR

MERIS

MERIS

MERIS

870 nm

ATSR-MERIS Comparisons


Orbit 2136 comparison aatsr atsr 2
Orbit 2136 comparison using Desert Targets (AATSR/ATSR-2)

ATSR-2

870nm

AATSR

870nm


Aatsr data processed to date
AATSR Data Processed to Date using Desert Targets

NOTE: Data before October 1st not used for validation


Example cloud test result
Example ‘cloud’ test result using Desert Targets

Sonora, Mexico


Metric extractions
METRIC Extractions using Desert Targets

  • 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 using Desert Targets

560nm

RAATSR/RMERIS = 1.041

660nm

RAATSR/RMERIS = 1.001

870nm

RAATSR/RMERIS = 1.037


Atsr 2 desert reflectances
ATSR-2 Desert Reflectances using Desert Targets

Use archive of ATSR-2

TOA Reflectances

from 1995 to 2000


Aatsr atsr 2 indirect comparisons
AATSR/ATSR-2 Indirect comparisons using Desert Targets

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 using Desert Targets



Summary of results obtained so far
Summary of results obtained so far using Desert Targets

  • 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 using Desert Targets

  • 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


ad