| 基于多尺度虚拟网格与坡度阈值的机载LiDAR点云滤波方法 |
| |
| 引用本文： | 龚亮,张永生,李正国,包全福.基于多尺度虚拟网格与坡度阈值的机载LiDAR点云滤波方法[J].测绘科学,2012(1):101-103. |
| |
| 作者姓名： | 龚亮 张永生 李正国 包全福 |
| |
| 作者单位： | 信息工程大学测绘学院;江西省数字国土重点实验室 |
| |
| 基金项目： | 江西省数字国土重点实验室开放研究基金资助项目(DLLJ201001);测绘学院硕士学位论文创新与创优基金资助 |
| |
| 摘 要： | 点云滤波是机载LiDAR数据后处理的基础工作,本文提出一种基于多尺度虚拟网格与坡度阈值的机载LiDAR点云滤波方法。该方法采用类似影像金字塔的方式构建不同尺度即不同分辨率的虚拟网格,各级网格都以每个方格内最低点作为地面种子点,然后根据坡度阈值以分辨率由低到高的方式逐层对种子点进行平滑处理,最后以最高分辨率即最小尺度虚拟网格地面种子点作为基准种子点对整个数据集进行滤波处理。本文分别采用城区与郊区两块机载LiDAR数据进行了实验。实验表明,该方法能够有效地提取出地面点,运算效率也比较高,具有一定的实用价值。
|
| 关 键 词： | 机载激光扫描 点云 滤波 多尺度虚拟网格 坡度阈值 |
A filtering method of airborne LiDAR data based on hierarchical pseudo-grid concept and slope threshold |
| |
| GONG Liang①②,ZHANG Yong-sheng①,LI Zheng-guo①,BAO Quan-fu.A filtering method of airborne LiDAR data based on hierarchical pseudo-grid concept and slope threshold[J].Science of Surveying and Mapping,2012(1):101-103. |
| |
| Authors: | GONG Liang①② ZHANG Yong-sheng① LI Zheng-guo① BAO Quan-fu |
| |
| Institution: | ①(①Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China;②Jiangxi Provincial Key Lab for Digital Land,Jiangxi Fuzhou 344000,China) |
| |
| Abstract: | Filtering of point cloud is the base of airborne LiDAR data processing.A filtering method of airborne LiDAR data based on hierarchical pseudo-grid concept and slope threshold was put forward in this paper.In this algorithm,a hierarchical pseudo-grid which is similar with the image pyramid was constructed firstly.The lowest points in each grid of every scale of pseudo-grid were defined as ground seeds.Then,the ground seeds of high scale pseudo-grid were compared with those of low scale pseudo-grid according to slope threshold.The ground seeds were filtered gradually.Finally,the ground seeds of the lowest scale pseudo-grid were used to filter the whole data set.An experiment was performed with two groups of LiDAR data in city zone and suburb.The results presented in this paper showed that the algorithm was efficient and available. |
| |
| Keywords: | airborne LiDAR point cloud filtering hierarchical pseudo-grid slope threshold |
| 本文献已被 CNKI 等数据库收录！ |
