P. Goryl
G. Chander
R. Santer
S. Saunier
M. Bouvet
2008
<p>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<span> </span><sup>-1</sup><span> </span>, 8.8 %.year<span> </span><sup>-1</sup><span> </span>and 0.1 %.year<span> </span><sup>-1</sup><span> </span>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.</p>
application/pdf
10.1109/IGARSS.2007.4423393
en
Preliminary radiometric calibration assessment of ALOS AVNIR-2
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