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This paper is part of a research about ribbed vaults systems in French Gothic Cathedrals.Our goal is to compare some different gothic cathedrals to understand the complex geometry of the ribbed vaults. The survey isn'tthe main objective but it is the way to verify the theoretical hypotheses about geometric configuration of the flamboyant churches inParis. The survey method's choice generally depends on the goal; in this case we had to study many churches in a short time, so wechose 3D reconstruction method based on image dense stereo matching. This method allowed us to obtain the necessary informationto our study without bringing special equipment, such as the laser scanner.  The goal of this paper is to test image matching 3D reconstruction method in relation to some particular study cases and to show thebenefits and the troubles. From a methodological point of view this is our workflow:  - theoretical study about geometrical configuration of rib vault systems;  - 3D model based on theoretical hypothesis about geometric definition of the vaults' form;  - 3D model based on image matching 3D reconstruction methods;  - comparison between 3D theoretical model and 3D model based on image matching

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

GOTHIC CHURCHES IN PARIS ST GERVAIS ET ST PROTAIS IMAGE MATCHING 3D RECONSTRUCTION TO UNDERSTAND THE VAULTS SYSTEM GEOMETRY