SPECTRAL ANAl 
ANALYSIS. ( 
* Laborato 
** Labo 
ABSTRACT 
This pap 
analysis of st 
by using coloi 
other hand, a: 
samples taken 
(Algeria), h; 
studied soils, 
us to identify 
As to the ( 
quantification 
extracted froi 
first view. 
KEYS WORDS:Ren 
and semi-arid 
INTRODUCTION 
In the f: 
factors the m< 
sensors are: 
- Roughnes 
- Mineral 
- Color of 
In order 
proposed meth< 
analysis and t 
of surfaces . 
a better ider 
these results 
ground studies 
In this i 
different the 
imagery corre 
results has ) 
whichdistingu) 
to stand out i 
In order 
analysis loca 
consists on 
composition o: 
curves of pix 
Landsat TM im;