Kólbl, Otto
Figure 1
3.3 Integration of video sequences
The highest degree of reality is doubtlessly obtained with video sequences. However, the incorporation of artificial
objects require a certain effort. The Institute of photogrammetry has specialised on this way of presenting objects. Spe-
cial software products like SoftImage in connection with Eddi allow to combine video sequence with synthetic objects.
This procedure is relatively simple : one tries to produce a video sequence of a synthetic object which largely corre-
sponds to the angle of view of the video images. This means that the photogrammetric orientation elements of the video
sequences have to be determined. If one determines these elements only approximately, then there can result disturbing
image displacement between the 2 types of images. Relatively good experience have been obtained when using a video
camera on a tripod which is slowly rotated.
4. PRACTICAL EXAMPLE : INVENTORY OF THE HISTORIC MONUMENTS OF THE DRÄA VALLEY
The presented working techniques are currently concentrated on a larger inventory project in the south of Morocco.
Furthermore, various efforts have been made in the conjunction with the planning of the metro of Lausanne.
Morocco disposes on a great richness on historical monuments; in the first places there are of course the kingtowns :
Fez, Marrakech, Meknès and Rabat. Beside this are a multitude of monuments with respect to the Islamic culture. Fur-
thermore, a particular baked clay architecture remained in the south of Morocco attributed to the local population, the
Berber; the origin of this architecture might go back up to 3,000 years.
The work is executed conjointly with an architecture office in Bern, directed by Hans Hostettler, his collaborator A.
Tornay and with the competent instances in Morocco. There, the work is under the general direction of Mr Touri,
director of the office on the ‘patrimoine culturel’, a section of the Ministry of Cultural Affairs. The local works is
directed by the former manager of the CERKAS (Centre de Conservation et Réhabilitation du Patrimoine Architectural
des zones Atlasique et Subatlasique) in Taourirt Ouarzazate Mr Faissal Cherradi and now by its successor Mr Mbarek.
In the beginning it was planned to realise this inventory principally with the help of orthophotos and classical stereo-
plotting. With the progress of the work, it showed very soon that the resulting information has to be properly collected
and made available for further analysis which is only possible with the help of an information system. Another chal-
lenge resulted from the necessity of characterising the architecture. Is it already sufficient to document the typical
architecture characteristics like façades, places or general view of villages by photographs and drawings or is it neces-
sary to elaborate a library of typical characteristic elements ? Of course it was not easy to define the data model
according to the various requirements of the architects.
448 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
