International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
  
In practice, band ratio (BR) method is simpler than the SI 
method. Because, the most of the time, there is no need to 
apply atmospheric correction in BR. However, only two 
channels that are reflected and absorbed channels are 
taken into account in the BR method. On the contrary, 
five SWIR channels are used to obtain spectral indices in 
SI method. Logically, using five channel should give 
more reliable results than the other that of two channels. 
This study show that SI method could be more suitable 
for detection of alunite minerals than that of BR method. 
6. ACKNOWLEDGMENTS 
The authors would like to thank Prof. Dr. Yasushi 
Yamaguchi (Dept. of Earth and Planetary Sciences, 
Nagoya University-Nagoya/Japan) for discussion on his 
developed spectral indices method, and Assist. Prof. Dr. 
Lutfi Suzen and Assist. Prof. Dr. Nurettin Kaymakci (Rs- 
GIS Lab. Dept. of Geol. Eng., METU-Ankara/Turkey) 
for their comments. The authors also would like to 
express their sincere gratitude to Murat Koruyucu 
(Remote Sensing Center, MTA- Ankara) for his 
suggestions and evaluations of this manuscript. 
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