Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER
Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER
Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER
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I<br />
0<br />
↑<br />
(H, Ω,<br />
Ω<br />
0<br />
)<br />
=<br />
1<br />
π<br />
γ<br />
s<br />
Uncollided intensity (2)<br />
The radiation scattered by the soil, which provides the lower<br />
radiative boundary condition of the canopy system, for<br />
uncollided radiation is given by:<br />
γ<br />
( H, Ω,<br />
Ω0)<br />
(H, Ω,<br />
Ω<br />
0<br />
)<br />
|<br />
μ<br />
0<br />
|<br />
I<br />
s<br />
⎡<br />
⎢1<br />
− λ<br />
⎣<br />
G( Ω0)<br />
⎤<br />
⎥<br />
| μ | ⎦<br />
Where s<br />
denotes the bidirectional reflectance<br />
factor of the soil at the bottom of canopy.<br />
0<br />
K<br />
I<br />
K<br />
k<br />
∏ + 1<br />
1<br />
⎡ G( Ω ⎤ ⎡<br />
↑ =<br />
⎢ −<br />
0)<br />
⎢ −<br />
' G( Ω<br />
0 (zk,<br />
Ω,<br />
Ω<br />
)<br />
0)<br />
γs(H,<br />
Ω,<br />
Ω0)<br />
| μ0<br />
| Is<br />
1 λ<br />
1 λK<br />
π<br />
| μ0<br />
| j=<br />
K μ<br />
⎣<br />
⎥<br />
⎦<br />
⎣<br />
⎤<br />
⎥<br />
⎦<br />
<strong>Gobron</strong>, N et. al. (1997) ‘A semi-discrete model for the scattering of light by vegetation’, Journal of Geophysical<br />
Research, 102, 9431-9446.<br />
43
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