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LERTS.l 
ABSTRACT 
Radiometric procesj 
correction of atmos] 
sensitivity study is i 
atmospheric char act 
investigated as well 
NDVI profiles whic 
KEYWORDS: Surf 
1. INTRODUCTIO 
AVHRR time series 
scientific communit 
are made possible 
atmospheric and di 
interprete the interaj 
Calibration 
AVHRR data users 
time. The correctioi 
data processing, in 
atmospheric par amt 
ozone contents. 
Variations 
variations. They de 
observation geomet 
(1991), a change oi 
seems that the corn 
that atmosphere cha 
Atmospher 
sensitivity of surfac 
Temporal evolution 
2. DATA 
Input data used in t 
applied to global d, 
data and different i 
17th, 1989. The trt 
Lybian desert to hig 
(Edwards, 1989, F 
corrections is discu: