  The Radiance Enhancement (RE) method was introduced for efficient detection
of clouds from the space. Recently, we have also reported that due to high
reflectance of combustion-originated smokes, this approach can also be
generalized for detection of the forest fires by retrieving and analyzing
datasets collected from a space orbiting micro-spectrometer operating in the
near infrared spectral range. In our previous publication, we have performed a
comparison of observed and synthetic radiance spectra by developing a method
for computation of surface reflectance consisting of different canopies by
weighted sum based on their areal coverage. However, this approach should be
justified by a method based on corresponding proportions of the upwelling
radiance. The results of computations we performed in this study reveal a good
match between areal coverage of canopies and the corresponding proportions of
the upwelling radiance due to effect of the instrument slit function.
