| 基于虚拟网格与改进坡度滤波算法的机载LIDAR数据滤波 |
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| 引用本文： | 张皓,贾新梅,张永生,董广军.基于虚拟网格与改进坡度滤波算法的机载LIDAR数据滤波[J].测绘学院学报,2009(3). |
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| 作者姓名： | 张皓 贾新梅 张永生 董广军 |
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| 作者单位： | 信息工程大学测绘学院;郑州大学教育技术中心; |
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| 基金项目： | 辽宁工程技术大学地理空间信息技术与应用实验室开放基金资助(2007007) |
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| 摘 要： | 提出了一种基于虚拟网格与改进坡度滤波算法的机载LIDAR数据滤波方法。该算法将虚拟网格的概念用于LIDAR滤波,避免了LIDAR点云内插或者平滑造成的信息损失。基于虚拟网格生成的初始表面模型是一个规则网格,在初始表面模型上进行地面点的选取,可以极大地提高运算效率。在改进的坡度滤波算法中,提出了4个坡度阈值,克服了经典坡度滤波算法在地形急剧变化的地方可能发生的错误。实验结果表明,该算法可以提取出大多数地面点,生成比较精确的DEM,证明了该算法的可行性。
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| 关 键 词： | 机载激光雷达 滤波 虚拟网格 表面模型 坡度滤波 |
Filtering of Airborne LIDAR Data Based on Pseudo-Grid Concept and Modified Slope Filtering Algorithm |
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| ZHANG Hao,JIA Xin-mei,ZHANG Yong-sheng,DONG Guang-jun.Filtering of Airborne LIDAR Data Based on Pseudo-Grid Concept and Modified Slope Filtering Algorithm[J].Journal of Institute of Surveying and Mapping,2009(3). |
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| Authors: | ZHANG Hao JIA Xin-mei ZHANG Yong-sheng DONG Guang-jun |
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| Institution: | 1.Institute of Surveying and Mapping;Information Engineering University;Zhengzhou 450052;China;2.Education Technology Center;Zhengzhou University;China |
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| Abstract: | Automatic filtering of airborne laser scanner data is one of the most difficult challenges in LIDAR data processing.A modified slope filtering algorithm of airborne LIDAR data were introduced,and the concept of pseudo-grid has been employed to avoid the loss of information.An initial surface model were generated from pseudo-grid model,then ground point selection was implemented on this initial surface,and the processing's efficiency was increased.In the modified slope filtering algorithm,there are four type... |
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| Keywords: | airborne LIDAR filtering pseudo-grid surface model slope filtering |
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