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number which makes it possible to locate the photographs and to find the buildings on the map. The description is given succinctly 
without any justification. There is however a more detailed description of all objects in another part of the documentation. 
Fig. 3a: View of the Kasbah of Taourirt drawn by the artist Henri Terrasse 
Fig. 3b: Rendered computer model of the Kasbah of Taourirt 
6. THE IMPLEMENTED DATA MODEL OF THE INFORMATION SYSTEM 
The most important aspect appeared to be the elaboration of the data model according to the necessary possibilities for analyses. As 
already explained, one recognises that many analyses are based on drawn oblique views, drawings of façades and drawings of over 
views. Such views can be realised by means of computer graphics in the easiest way on the base of 3D-modelling (cf. fig. 3). Over 
view sketches and synoptic presentations of all ksour with their characteristics require the elaboration of a database in which the most 
important elements are integrated. Another important aspect is the requirement to show individual houses in very detailed presenta 
tions 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 information system. 
6.1 Regional Organisation of the Information 
In order to cope with these requirements, the geometric information had been subdivided in 4 different levels: 
• Overview presentations in the approximate scale of 1:1,000,000 based on the Michelin Map 
• Regional presentations based on orthophotos 1:10,000 
• Local presentations of the ksour and 3D-modelling with the help of orthophotos 
• Detailed presentation of individual houses 
The descriptive information had been linked primarily with the local presentations; nevertheless, reference had been established with 
respect to the overview presentations in order to allow the elaboration of synoptic presentation of all ksour (cf. fig. 2). This presenta 
tion concerned the whole Drâa Valley and also enabled the presentation of other architectural elements.