Kölbl, Otto 
  
4.1 Considerations on the data model 
As most important it appeared to elaborate the data model according to the necessary possibilities for analyses. If one 
considers the literature and especially of this region there are a considerable number of books available, one recognises 
that many analyses are based on drawn oblique views, drawings of the facades and drawings of overviews. Such views 
can be realised by the means of computer graphics in the easiest way on the base of a 3D-modelling (cf. fig. 2). Over- 
view sketches and synoptic presentations of all ksour with their characteristics require the elaboration of a database in 
which are integrated the most important elements. Another important aspect is the requirement to present individual 
houses in a very detailed presentations and to establish a reference of these presentations with the original presentations. 
Furthermore, various photographic views and sketches and detailed descriptions have to be integrated into this informa- 
tion system. 
  
   
    
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llected In order to cope with these requirements, the geometric information had been subdivided in 4 different levels : 
1 chal- i 
typical 1. Overview presentations in the approximate scale of 1:1,000,000 based on the Michelin Map 
 neces- 2. Regional presentations based on orthophotos 1:10,000 
model 3. Local presentations of the ksour and 3D-modelling with the help of orthophotos 
4. Detailed presentation of individual houses 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 449