Figure 5. 
Edge detection with 
Sobel kernel upon a frame 
from LANDSAT - TM 
august 1989 recording, 
containing Caraorman area 
(a) and radiometric profile 
upon the same area for ERS 
recording April 1989 - (b) 
and initial image (c) and. 
also for LANDSAT - TM 
recording August 1989 - (d) 
— radiometric profile and 
(e) initial image.. 
  
  
  
  
cti : zer] 
(c) (e) 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 741