期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-5/C53
出版社：Copernicus Publications
摘要：There exists a very large amount of damaged buildings in Cultural Heritage. Common damages are related with structural deformations (lack of verticality, crashes, e.g.) and the degradation of the support (deteriorated materials, e.g.). A dense information is needed for both of them. Non-intrusive methods based in laser scans provide a 3d support with dense information with a low human cost. In this work, a special attention is paid to structural deformations. The performed methodology consists of the following steps: 1) Construction of the global model; 2) interactive selection of slices and projection of reference planes; 3) extraction of a regular sequence of longitudinal and transversal sections linked to slices which can be exported to CAD models; 4) re-projection of each regular sequence of slices on a common reference plane; 5) separation between measurements and algorithmic errors; 6) evaluation of the lack of elementary symmetries for longitudinal or transversal sections; 7) identification of pathologies by simple inspection between enough separate sections . To achieve these goals the software platform UVACAD has been developed for solving visualisation issues relative to subclouds of points extracted from the global model. Interactive visualization concerns to basic projective operations (sections and projections), cell decomposition and colour reprojection of the global 3d model. Resulting slices with constant width are regularly distributed in parallel planes; and they provide a support for a half-automatic drawing (with a graphical interface) of contours on exported orthoimages. Structural damages can be visualised in a transparent way by overlapping the exported orthoimages. These results are illustrated with an example relative to the gothic church of Villamoron (Burgos, Spain). The performed 3d model has provided an accurate surveying which has allowed the assessment for a quick intervention policy for correcting serious damages which have been observed in the precedent study
关键词：Cultural Heritage; Architectural Surveying; Terrestrial laser scanning; Close range photogrammetry
