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Figure 1. 
Laser locator image and corresponding aerial digital photo of power line in Switzerland. November, 1999. The data was 
obtained with laser locator Optech ALTM-1020 and digital photo camera KODAK EOS DSC 1a. 
Figure 2. 
Shadowed DTM of the same area. Vegetation, towers, buildings and all other man-made objects are automatically 
removed.