637
1 soil surface,
tal surface is
il reflectance
lunation and
ification. The
Hite scanners
Royer at al.,
explained by
ices, i.e., soil
effects which
1987; Cooper
1985; Pechet
f soil surface
¡flective near:rived
near:rived version
isotropic soil
tduced by the
r proportional
ams on these
ong the solar
) and vertical
he horizontal
he azimuthal
sses isotropic
structure are
changes with
( 1 )
of the given
Tg, Sg). The
le linear sub,
sub, and also the
elation to the
e about wave
NADIR VIEWING
( 2 )
solar azimuth
s 0 when the
do not reach
»rtional to Epj
f an isotropic
d soil surface
Figure 1. Geometry of the illuminated soil surface along the solar principal plane with sunlit (I) and shaded (S)
sub-segments of the given spheroid (Is, Ss), the adjoining spheroids (la, Sa) and the ground between the
spheroids (Ig, Sg), situated at angles pi. Symbols r f and r b describe the radii of the basic view distance.
