4.3 Satellite images 
From actual remote sensing projects three ERS-1 GTC 
images have been combined to a RGB-composite (Fig.4) 
(Lotz-Iwen, Göbel, Markwitz, 1995). 
  
Fig.4, ERS-1 radar image 
This image will be matched with the topographic map 
(Fig.5). 
  
  
Fig. 5, Digitized topographic map 
The data fusion between map and radar image is very 
important for the advanced interpretation of the radar 
image. A visual quality control is also possible, but 
generalization effects in the map have to be considered. 
4.4 Terrestrial photographs and line drawings 
To show that the software is not only applicable for 
spaceborne and airborne images there are also examples 
from terrestrial applications. Under the condition that all 
tiepoints have to be measured in one flat area, parts of a 
building can be rectified (Fig.6). 
  
Fig.6, Architectural photograph 
As reference serve local coordinates, which have been 
measured with an electronic tachymeter or existing line 
drawings, which have been digitized on a flatbed scanner 
(Fig. 7). 
  
Fig.7, Digitized line drawing 
With the geolocation function of the program ONSCRE 
digital monoplotting can be carried out (Frick, 1995; 
Heipke, 1995). Measured objects can be stored in local 
coordinates and image coordinates, too. This tool in 
combination with BPROTRA is used for student education 
at IP! every year. 
  
142 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B6. Vienna 1996 
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