3D INDOOR MODELING OF BUILDINGS BASED ON PHOTOGRAMMETRY AND TOPOLOGIC APPROACHES

O. Al Khalil (1) , Pierre Grussenmeyer (1) , Mohamed Nour El Din (1)

1 MAP - Modèles et simulation pour l'architecture, l'urbanisme et le paysage

Three-dimensional modeling of indoor scenes is interesting for many applications like building representations, indoor facilities and
architectural information systems. Modeling is used to document, preserve, restore or rebuild buildings. Properties of objects are
characterized by a set of descriptors. In most applications, the model contains only information about the shape and the texture of the
object while its topologic and semantic data are not processed. In this paper, we propose a method for the extraction of the
information of an indoor scene and its reconstruction by combining geometric and topologic information.
The indoor part is structured in blocks like rooms, corridors, etc. with their own orthogonal coordinate systems. A block is presented
in an abstract way using a Data Conceptual Model to identify the entities and the relations to include in the database.
In our approach, geometric and semantic data (which define the entities to be modeled) are extracted simultaneously by using a
digital photogrammetry software and an independent Graphical User Interface (GUI). The structuring of geometric, topologic and
semantic data is done within the measurement process. MicroStation-J Geographics is used afterwards to complete the database and
generate the 3D model automatically. Co-planarity conditions between entities as windows or doors and the compatible walls are
taken into account. The blocks are merged by the use of “virtual doors”. These doors are defined in function of the wall thickness and
the translation direction according to the local coordinate systems of the blocks.
The final model offers several applications:
? topologic navigation in the models,
? visualization and extraction of the geometric characteristics of given types of entity (areas and perimeters),
? visualization of " the virtual doors ", used to calculate the parameters of the transformation
(rotation and translation) between the reference coordinate system and the local systems attached to the
different blocks.
? generation of photo-realistic models .
Our prototype has been applied to the modeling of a classroom at ENSAIS and to an Egyptian historical monument (The Wakala of
Qaitbay in Cairo)

Mots clés: 3D model; 3D acquisition; Data Conceptual Model; modeling levels; databases; indoor modeling; digital<br />architectural photogrammetry

Domaines: Architecture, aménagement de l'espace

O. Al Khalil, Pierre Grussenmeyer, Mohamed Nour El Din. 3D INDOOR MODELING OF BUILDINGS BASED ON PHOTOGRAMMETRY AND TOPOLOGIC APPROACHES. XVIII CIPA International Symposium, 2001, Germany. pp.1-7. ⟨halshs-00281219⟩