36°00" ai 37°30° 
20900" 
18°00° 
  
  
Fig. 1: Georeferenced Landsat image mosaic (original in color) of the Red Sea Hills in Sudan from 17 to 20° N and 36 to 
37.30° E (after OTT, 1996). For explanation see text. 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996