3-4. Growing status and spectral radiance factor
The relation of three parameters, which show the growing
status of the rice, and the spectral radiance factor of the
canopy have been analyzed for the yields estimation with the remote
sensing data. These three parameters are Leaf Area Index (LAI)
which shows the number of leaves, a biomass which shows the amount
of the produced organic matter, and horizontal projection area
whcih shows the coverage rate of the rice on the ground.
LAI is the number of leaves per unit area, where the number of
of leaves per one sampled stump is multipled with number of the
stumps per unit area.
The biomass is the amount of the organic matter of rice, where
the weight of the dried one sampled stump is multipled with
the number of the stumps per unit area
The horizontal projection area is the ground cover area of
the canopy per unit area, where the area of one sampled stump's
canopy is multipled with the number of the stumps per unit area and
the calculation is carried with the picture of the stump taken
vertically.
The relation among these three parameters and the spectral
radiance factor of the Infrared band (ir) are shown in Fig.3-6,-
3-14.
In Fig. 3-18, the radiance factor of the red band is also given
The spectral radiance factor (IR) in the IR-band was used
for the analysis of the relation between the growing status and
those components, because the reflectance of the leave and the
ears in the IR band (Fig. 3-2, 3-3) is not affected with the
fertilizing status but affected by the structure of the leaves
and the stumps.
This relation can also be estimated through the tendency
that the IR band is very sensitive to the change of LAI and
the visible band is not sensitive to the chage of LAI.
In Fig. 3-16, - 3-18, LAL and the biomass and the radiance
factor (IR) did not show the hightest correlation but both
showed the positive correlation.
While H.P.A. and the (IR) had a very high correlation which
can be expressed with the quadratic curve. The phenomenon
to down in the (IR) when H.P.A. is low, depends on the ground
coverage with the leaves and the phenomenon to up when H.P.A.
is high depends on the growing status and on the leaves and ears
yellowing.