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Activiities of ASTER Working Groups |
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Radiance calculation and recommended calibration coefficients
VNIR/SWIR LEVEL-1A, 1B, 3A
Equations and background to calculate the radiance from ASTER L1A, L1B and 3A.
And, the method to recalculate the radiance and recommended correction equations.
In detail
Equations for ASTER radiometric calibration
TIR Level-1A, 1B, 3A
Radiometric calibration coefficient (RCC) versions 1.x and 2.x used for ASTER Thermal Infrared (TIR) products
processed before 8 February 2006 include an error caused from delay in RCC updating.
This error has been reduced for RCC version 2.09 or later, applied to products observed after October 2002,
but is large in earlier RCC versions, particularly versions 2.05 and 2.06 applied to products observed from February 2001 to October 2002,
although the error depends on a scene observation date.
Recent products processed on or after 8 February 2006 have been calibrated by RCC versions 3.x
which are regressively calculated on a day-by-day basis by Sakuma's method (2005).
Thus, RCC versions 3.x are basically accurate enough, but still include some errors dependent on a scene observation date,
particularly products observed around late June and early July in 2006 may have a not-small error.
ASTER TIR Recalibration
ASTER TIR Recalibration
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Vicarious Calibration
The radiometric calibration of ASTER is carried out using the onboard calibration data.
Radiometric Calibration WG periodically checks the radiometric accuracy by the vicarious calibration and updates the method to calculate the radiance based on the outcome.
See the individual WG member sites for details:
The University of Arizona (Dr. Thome)
Saga University (Dr. Arai)
National Institute of Advanced Industrial Science and Technology (Dr. Tsuchida) New!!
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