文章基本信息

标题：Estimating Intrinsic Accuracy of Airborne Laser Data with Local 3D-Offsets
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作者：Frédéric Bretar ; Marc Pierrot-Deseilligny ; Michel Roux 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：2003
卷号：XXXIV-3/W13
出版社：Copernicus Publications
摘要：Airborne laser systems provide a three-dimensional (3D) perception of the Earth's topography with clouds of points. Whereas the technique ensures a high theoritical quality, one can observe discrepancies in certain areas. This situation may be of importance in case of joint sensor application, like merging airborne laser scanner with photogrammetry. The first step of a fusion process is to define a common reference frame so that a global geometric coherence should be extracted. This article describes a methodology for matching a single laser strip with a photogrammetric derived Digital Elevation Model (DEM), and as a result estimating intra-strip errors. It is based on calculating local linear deformations with a tri-dimensionnal accumulator (translation space). We show that searching for local discrepancy is equivalent to compute the maximum of the accumulator. 2D and 3D simulated problems are discussed in details and solved over known transformed data set. Results on real data show a significant improvement when applying retrieved local translations to laser points. After correction, both data sets tend to be expressed in the same reference frame. The accurate registration is then ensured
关键词：lidar; accuracy; local corrections;3D-accumulators; deformation field; registration