24 November 2009 Efficient visualization of LIDAR datasets
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The purpose of presented point-based rendering method is to visualize data retrieved from 3D scanners, especially from Light Detection and Ranging (LIDAR) scanners. LIDAR data scanners capture highly accurate and dense data and are used to gather vast spatial information about geographical areas. As a result, a lot of points are obtained and optimization techniques are needed for their real-time visualization. Fully interactive system with high frames-per-second (FPS) ratio is presented in this paper. The efficiency is achieved by reduction of a graphics workload, based on space subdivision, using a quad-tree. The points maintained in the leaves of the quad-tree are aligned evenly through nine or more depth-levels, depending on the number of points in the leaf. Such subdivision allows effective control of level-of-details (LOD) as it minimizes the number of calculations, needed for the visualization in real-time. The changes in the organization of data during the run-time are very rare and therefore, the LOD hierarchy can be established in the preprocessing. A method for achieving a detailed look of the scene, even at low LOD degree, is implemented, too.
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D. Mongus, S. Pečnik, B. Žalik, "Efficient visualization of LIDAR datasets", Proc. SPIE 7513, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Process Technology, 75130M (24 November 2009); doi: 10.1117/12.837954; https://doi.org/10.1117/12.837954

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