nates from 3.using the actual terrainheight as the argument for 
interpolation. 
The orthophoto derived, may also be generated with a digitally 
determined coordinate grid,as well as edge or gradient enhance- 
ment procedures may be utilized to generate quasi line maps. 
Fig. 3.1 shows a spaceborne slant range SAR image. The digital 
data are of courtesy of the JPL/Pasadena(USA) and the DLR/Ober- 
pfaffenhofen(FRG)and have been processed by the OPTRONICS P1700 
device of the Inst.for Photogrammetry in Hannover. This type of 
imagery is a typical product, as delivered by the data acquisi- 
tion side. 
A new standard product, like the sample in Fig.3.2 is recommen- 
ded in particular for hilly and mountainous terrain,in order to 
verify a reliable geocoding of radar imagery. This radar ortho- 
photo has been processed by LOHMANN. The digital data, already 
north oriented, possesses a uniform original scale of 1:200 000. 
The DEM-influences are already rectified, as well as changes in 
the attitudes, see also SCHROEDER et al. (1985). 
  
  
Fig. 3.2: SIR-B radar orthophoto (approximate scale 1: 300 000) 
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