Radiance (LT) from paths 1, 3,
and 5 contains intrinsic valuable
spectral information about the
target of interest.
Conversely, the path radiance
(LP) from paths 2 and 4 includes
diffuse sky irradiance or radiance
from neighboring areas on the
ground. This path radiance
generally introduces unwanted
radiometric noise in the remotely
sensed data and complicates the
image interpretation process.