文章基本信息

标题：Ordering Criteria for Information Management in 3D Laser Surveying of Small Urban Spaces
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作者：J. Finat ; L. Fuentes ; J.J. Fernández-Martín 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：2005
卷号：XXXVI-5/W17
出版社：Copernicus Publications
摘要：The introduction of laser-based photogrammetry in the surveying of Cultural Heritage provides an increasing volume of data, which requires multi-resolution approaches for analyzing and displaying the 3D information. Three-dimensional laser scanning provides accurate geometric and radiometric information about buildings fa.ades and volumetric display of bounded urban zones. In particular, it makes possible the generation of 3D models of scanned areas allowing a customized management of navigation through the data. Some complexity issues are linked to the unordered character of scanned points, making difficult the application of traditional software libraries of Computer Vision and Computer Graphics. Ordering criteria based on geometric and radiometric criteria simplify the computer management of architectural and urban primitives and allow perform a hierarchised approach by making compatible recognition tasks with different levels of detail and 3Dvisualization. The integration of geometric and radiometric information on a discrete volumetric model given by dense clouds of 3D points simplifies an interactive generation and management of virtual models with accurate information. Several illustrations of bounded urban zones corresponding to Spanish urban squares are given. The automatic identification of dominant planes in clouds of points reduces in a drastic way the volume of original clouds of points, and provides inputs for synthetic geometric information, which can be managed by a CAD programs. Transference of information is symbolically managed on geometric primitives, given by dominant planes which are optimally fitted with respect to the original clouds of points. An intensive hand-held work is performed for VR-based models with some application to the inside of a singular building inside the urban environment. Methodology for registration, integration and post-processing developed in this paper is flexible enough to be adapted to another bounded environments, and will be develop din the near future
关键词：Laser Scanner; Surveying; Architecture; Data Processing; Virtual Reality