By Raphaële Héno
Conventional topographic databases, bought through seize on aerial or spatial pictures offer a simplified 3D modeling of our city surroundings, answering the wishes of diverse purposes (development, threat prevention, mobility administration, etc.). in spite of the fact that, after we need to signify and examine extra advanced websites (monuments, civil engineering works, archeological websites, etc.), those versions not suffice and different acquisition and processing ability need to be applied. This booklet makes a speciality of the examine of tailored lifting capacity for "notable buildings". The tools tackled during this ebook hide lasergrammetry and the present strategies of dense correlation according to photographs utilizing traditional photogrammetry.
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Additional info for 3D Modeling of Buildings. Outstanding Sites
It is also necessary to take account of some differences between reality and this model, in the case where their effect is higher than the accuracy expected of this method (the curvature of the earth and atmospheric refraction in aerial photogrammetry and optical distortion in all cases). In close-range photogrammetry (as opposed to aerial photogrammetry, which is farther from the object of study), optical distortion is the most important factor to be taken into account. 4. Determining the parameters for the image formula: photogrammetric orientation The image formula, essential to any photogrammetric production, depends on the position (S) and the orientation (R) of the camera at the time the images are taken, as well as the geometric characteristics of the camera itself.
Reconnaissance stage Reconnaissance of a site starts with a visit of the area to be surveyed as detailed in the building specifications. It involves the precise definition of elements to digitize, including the resolution and accuracy of georeferencing demanded. It is useful for the project sponsor to be present in case of any ambiguities emerging from the building specifications. ) To save time and simplify the acquisition process, attempts should be made to minimize the number of laser stations needed.
IGN 92] IGN, GEOFIL, Magazine de l’Institut géographique national, 1992. , “Une approche opérationnelle pour la production de modèles 3D urbains”, Revue Française de Photogrammétrie et Télédétection, vol. 176, pp. 14–20, 2004. , “Reconstitution virtuelle de l’église abbatiale Cluny III: des fouilles archéologiques aux algorithmes de l’imagerie”, Actes du colloque of Virtual Retrospect 2009, Pessac, 18–20 November 2009, pp. 151–159, Archeovision, vol. 4, Editions Ausonius, Bordeaux, 2010. , “3D virtual reconstruction and visualization of complex architectures – The “3D-ARCH” project”, Proceedings of the ISPRS Working Group V/4, Workshop 3D-ARCH “3D Virtual Reconstruction and Visualization of Complex Architectures”, Trento, Italy 2009.
3D Modeling of Buildings. Outstanding Sites by Raphaële Héno