ABSTRACT 
The strong angul 
the period of coi 
vegetation on re 
emphasis given t 
reflectances (cor 
expresses bidirec 
related to the opt 
time profiles of 
effects, this reflec 
1 - INTRODUC1 
Monitoring of ten 
importance in sev 
necessary for an 
since vegetation c 
air flow momenti 
agricultural surve; 
since primary prot 
and trace gases. A 
either natural or c 
ecosystem dynami 
Although 
straightforward w; 
visible and near ir 
activity of the vej 
vegetation cover, 
reflectance in the 
resolution compati 
these reflectance n 
1 to several thoust 
satisfy the needs of 
The only ; 
High Resolution R; 
AVHRR instrumen 
Tucker et al., 1985 
et al„ 1987). The v 
Earth, which leads 
directly comparable 
1984; Gutman, 19‘ 
composition, and 
corrections. Interar 
Atmospheric correc