Bürger, Thomas 
  
  
Figure 6: Orientation of image using visible pipe-edges and known position of pipe-segments 
Onscreen digitizing of exterior orientation in a space assignement plan of the plant. 
Onscreen digitizing of points near the pipe-edges and searching for the edges with Hough-transformation (Fig. 3). 
Selecting the correspondant pipe-segments from the as-built-model superimposed in the image. 
Starting orientation procedure. 
Superimposing the plant-components after orientation as a visual verification of the process. 
This orientation method should be applied only to single images using reliable geometric data from edges or pipes. It 
would be preferable in future to integrate orientation of images by plant-features directly into bundle adjustment algo- 
rithms. This will reduce also the amount of passpoint and tiepoint targets to be fixed in the plant and consequently reduce 
the time to spend in the plant. 
4 THE PROTOTYPE SYSTEM 
   
  
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Figure 7: Digital image and shaded as-built model with same orientation generated from ABANICO 
The methods and tools presented in this paper are integrated into a prototype close-range photogrammetric system called 
ABANICO? developed at the Technical University of Clausthal. The tools have been proofed to be valuable in various 
pilot projects within the University and also within plants of the chemical industry (Bürger, 99). 
2 As Built Acquisition of Non-documented Industrial and Civil Objects 
112 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 
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