The measurement targets with different disease rating of
area were prepared using collected rice leaves with the
symptom of progress disease.
2.3 Results of Measurement and Discussion
Fig.1 shows the spectral feature's comparison of adaxial,
abaxial, and mixed with both sides leaves with healthy
condition.
Reflectance(%)
QI bs
e: xu
N
je"
peed
© c
~~ %
e go
wn
Oo ©
from healthy vegetation.
It had relatively low reflectance with about 5% in the
visible region from 300 to 490nm.
the near infrared from 760 to 1,140nm.
and highest in 800 nm respectively.
rd
/
J
IT od =
MA
|
NA
—[-—i1—
mar fees voue eee eme
d
i i A A. i i A A i A
ce c c2 c c cC c c c c c c
co eo ea co co co co co co Go co eo
CQ + vo co c C st © co c Cl +
v ve c spe] v CX) Cs] Cx)
Fig.1 Spectral Feature of Adaxial,Abaxial and Both Side
30
70
60
A
©
Reflectance( #6)
— n3 UJ B
e e ouo
©
i
A
None
— — — — — less than 5%
-T------- less than 2096 |
ns at rn de over than 20% |
— nim mm almost whole
r= Sw
’ J v ^N
A:
SN
^ $9 =
\ LAN
4
Zi!
]
X a a A. A A R
c C c» c c c c c
eo Co CO Co eo ceo co eo
C e c3 CM VI e cC CM
2480 <=
Wawvelength{nm)
Fig.2 Relationship between Spectral Feature and Different Rating Damaged Area
808
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996
It was proved to have almost same spectral characteristics
for every case and they also had a typical spectral feature
On the other hand, it had relatively high with over 60% in
It had lowest reflectance in the spectral region of 340nm
Wavelength(nm)