3.3 Pont Adolphe 
In co-operation with Administration Ponts & Chaussées of 
Luxembourg the suitability of low-cost photogrammetric 
systems for the documentation and measurement of 
bridges has been investigated (Gay &Hartenstein 1995). 
As an initial project the Pont Adolphe (built in 1902) has 
been chosen. At one time this was the largest stone 
bridge in the world (Figure. 12). A complete 3-D model of 
the bridge has been requested in order to derive ground 
views, side views and projections of the major arches 
(example in Figure 10). 
Especially in this project a lot of images look very similar 
so that unique image identification is only possible if 
image archiving has been carefully done. For this 
purpose the above mentioned image database was a 
helpful tool that enables even a second operator to work 
easily with the image material. 
The bridge spans the Petrousse canyon in the city of 
Luxembourg. It consists of two separate longitudinal parts 
covered by a common roadway. The bridge is 
approximately 180m long and 60m above the river, with a 
maximum span of 80m. The steep slopes of the canyon, 
the river and the vegetation on the slopes create very 
complicated environmental conditions. Numerous 
photographs must be taken from a 30m hydraulic lift. Due 
to very limited camera stations a number of overlapping 
images must be taken by panning the camera. Figure 11 
shows the configuration of those images used for final 
data collection. 
240 
  
Figure. 12: 
Pont Adolphe, Luxembourg 
3.4 Main Station Oldenburg 
The Main Railway Station of Oldenburg has been chosen 
as a test object for a student's diploma thesis (Bahn & 
Krite 1998). The major topic of the work deals with the 
superimposition of real images onto the CAD model in 
order to generate ortho-images of the facade (texture 
mapping) (Streilein 1995, Pomaska 1996). 
  
  
Bahn, W 
Erstellung 
Texturüber 
Bahnhofs. 
Oldenburg 
Bendler, ( 
eines eir 
Unpublishe 
Benning, 
photogram 
Auswertes 
Photograrr 
Benning, ! 
digitale PI 
für | 
Vermessu 
Gay, O., 
Bestandse 
Luxemburg 
Oldenburg 
Godding, 
Close-Rar 
Digital Sy: 
Gruen/Kat 
Technique