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Figure 5: Reasons why not using Laser Data 
6 PHASE TWO OF THE PROJECT 
The aim of the second phase was to establish a test field that can be used for testing and evaluating laser scanning 
systems and data processing algorithms. The area should be surveyed by as many laser data suppliers as possible. The 
test area was found including both built-up areas, forests and engineering objects such as power lines and railroads, but 
there were several problems related to this: 
» The test area should satisfy several different types of applications, e.g., open fields, forests, dense city areas, power 
lines and water surfaces. 
If the absolute accuracy of the systems are to be evaluated the checkpoints in the test field must be of very high 
quality. 
* The test field should be located in a, for as many as possible, convenient place. 
The negotiations with the companies showed a big interest in participating in the project even though the companies are 
not paid. The possibility to show the high potential of different applications based on laser data seems to be attractive 
enough for data providing companies to combine the test flight with another order to be carried out. 
It was finally decided to use the Vaihingen / Enz test field that has already been used for other OEEPE projects. in 
addition, the companies were asked for some data of the Stuttgart city centre. This enables some tests for the derivation 
of 3D city models, an application that, following the results of phase 1, is one of the most promising ones regarding the 
expectations of user. 
Field measurements for the check areas and some concise objects finished in February. At the same time, the first 
flights were done. When finishing this paper, data were not yet delivered, but the WG is expecting to have results 
available before summer. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 723