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uage of 
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s terrain 
ics had 
at least 
  
Kälbl, Otto 
  
for version 2 it showed some deficiencies as for the reliability. For the final implementation we preferred therefore 
MGE. Within MGE there are modules available for the communication with the Internet like GeoMedia and GeoWeb. 
Furthermore, software products like SoftImage and Eddi have been used for special effects of virtual reality. 
  
  
  
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Figure 4 
4.3 Presentation of the results 
The information system presented here in connection with MicroStation and MGE allows to meet the requirements for 
the presentation of the results. The 3D-modelling and the generation of 3D presentations are standard routines of 
MicroStation. Scenes in action can be produced as video sequences in batch processes and can be stored. Another pos- 
sibility is given by QuickView. In this case, the model scenes are stored and the movements are monitored in real time. 
It is understood that there are nevertheless limitations as for the graphic presentation. 
Over the information system MGE one can generate various thematic maps over special queries generating arbitrary 
symbolic presentation. A particularity is the possibility of the generation of orthophotos coloured thematically (cf. fig. 
5). Orthophotos are a very appropriate mean in order to show a region as realistic as possible. It is very easy to combine 
orthophotos with line and point symbols. The use of area symbols is however very limited and reduces heavily the read- 
ability of the photographic content. A way out is the use of pseudo colours. That means that the content of the image is 
not presented in the colours of the photo but thematically variable colours, for example the ksour in various hues of 
brown, new constructions in violet and the vegetation in green. In this case the photographic content remains readable 
but it is very easy to recognise its thematic attribution. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 451