Consideration on Satellite Data Correction
393
Correction of Reflected Intensity
The satellite data collected in nadir and off-nadir directions differ in spite of
observation at the same point on the earth's surface. Then the correction must be done
for these data. To correct them, we measured bidirectional reflectances by a remote
sensing simulator. The equation of the reflected intensity is represented by use of
Minnaert constant (Minnaert, 1941) such as the following:
where k is a Minnaert constant, and
and are incident and detection angles,
respectively. Since two different Minnaert constants
and
are obtained from the
indicatrices at the same point measured in nadir and off-nadir directions, the two
reflected intensities and of nadir and off-nadir direction, respectively, are:
As these reflected intensities are assumed to be equal, so