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标题：UVACAD: A Software Platform For 3D Architectural Surveying
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作者：Juan-Diego Perez-Moneo ; J. Tordable ; J. Finat 等
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：Multirresolutions approaches require hybrid solutions for processing, analysis and visualisation of architectural and urban environments. Hybrid solutions must combine the accuracy of photogrammetric recording, density of point clouds captured with laser scans and increasing facilities provided by rendering of complex environments relative to reality-based 3d models. An efficient handling of the corresponding software tools requires the design and implementation of a global platform able of profiting the benefits of available software tools under a common environment. Along last two years and simultaneously to a very large amount of fieldwork (more than four thousand scans of different architectural styles and urban environments), the DAVAP Group has developed a software platform for a hybrid development and integration of surveying tools for dense clouds of 3d points and high resolution views. The performed hybrid strategy involves all phases of the well-known pipeline of processing clouds with the following contributions: 1) Data acquisition: High resolution views having approximately the same localisation (position and orientation) as the laser scan are incorporated; 2) Preprocessing: including the design and implementation of filtering algorithms for filling projections of dense clouds of points on orthoimages; 3) Registration: In absence of previous alignement on the site, it is necessary to identify the transformations between the different pieces to be merged, including the management of information arising from laser scans with different ways of representing the external world; 4) Integration for combining and merging the different pieces by using information for bounding surfaces (triangulation) or volumes (voxelization): Modelling and implementation of different strategies for simplifying clouds and octrees as superimposed structures in order to handle huge clouds; 5) Post-processing: Complete and reduce information of superimposed structures to dense clouds of points by filling holes and adaptive reductions of triangular meshes linked to importance functions. In this work we illustrate these principles with some applications concerning to small urban environments (an urban GIS for 4 villages of Palencia, Spain), the analysis of isolated buildings with Cultural Heritage interest (a large number of damaged churches, and castles), archaeological sites (the Roman city of Clunia), high-resolution hybrid models (interior of San Isidoro, Leon) and complex urban environments (Roman and medieval walls of Leon, Spain). A lot of work to be done concerns to an intelligent refinement or simplification, according to different importance functions, analysis for local recognition of 3d primitives, and volumetric segmentation. The interplay between strategies for integration (meshing and voxelixation) is a challenge for the next future
关键词：Close-range Photogrammetry; Cultural Heritage Surveying; Fusion of information; Points clouds; Software ; development