Abstract
The Along-Track Scanning Radiometer-2 (ATSR-2) is equipped with
visible and near-infrared channels at 1.6, 0.87, 0.66, and 0.56
µm. An in-flight visible calibration (VISCAL) system
used to convert the raw signal to top-of-the-atmosphere reflectances is
described. To monitor the long-term stability of the VISCAL, a
number of large-area stable terrestrial sites have been
employed. We describe the methods used to determine the long-term
drifts in the ATSR-2 onboard calibration device and evaluate the
suitability of the sites for calibration monitoring.
© 2002 Optical Society of America
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