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Landsat MSS and TM 
huss 7 919km, hq4 2 713km 
    
  
BW aerial photography 
h=1.8-9.0km 
terrain analysis 
A 5 n as fieldradiometry 
Figure 1. Multilevel regional monitoring in the African Sahel. 
Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 105