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)