Preliminary radiometric calibration assessment of ALOS AVNIR-2

M. Bouvet; P. Goryl; G. Chander; R. Santer; S. Saunier

doi:10.1109/igarss.2007.4423393

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Preliminary radiometric calibration assessment of ALOS AVNIR-2

M. Bouvet·P. Goryl·G. Chander·R. Santer·S. Saunier

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Abstract

This paper summarizes the activities carried out in the frame of the data quality activities of the Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) sensor onboard the Advanced Land Observing Satellite (ALOS). Assessment of the radiometric calibration of the AVNIR-2 multi-spectral imager is achieved via three intercomparisons to currently flying sensors over the Libyan desert, during the first year of operation. All three methodologies indicate a slight underestimation of AVNIR-2 in band 1 by 4 to 7 % with respect to other sensors radiometric scale. Band 2 does not show any obvious bias. Results for band 3 are affected by saturation due to inappropriate gain setting. Two methodologies indicate no significant bias in band 4. Preliminary results indicate possible degradations of the AVNIR-2 channels, which, when modeled as an exponentially decreasing functions, have time constants of respectively 13.2 %.year -1 , 8.8 %.year -1 and 0.1 %.year -1 in band 1, 2 and 4 (with respect to the radiometric scale of the MEdium Resolution Imaging Spectrometer, MERIS). Longer time series of AVNIR-2 data are needed to draw final conclusions.

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M. Bouvet, P. Goryl, G. Chander, R. Santer, S. Saunier. 2008. Preliminary radiometric calibration assessment of ALOS AVNIR-2. https://doi.org/10.1109/igarss.2007.4423393

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