Remote Sensing Applications and Decision Support

Airborne laser scanning point clouds filtering method based on the construction of virtual ground seed points

[+] Author Affiliations
Xiaoqiang Liu, Mengru Yao

Nanjing University, Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing, China

Nanjing University, Department of Geographic Information Science, Nanjing, China

Yanming Chen, Liang Cheng, Shulin Deng, Manchun Li

Nanjing University, Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing, China

Nanjing University, Collaborative Innovation Center for the South Sea Studies, Nanjing, China

Nanjing University, Department of Geographic Information Science, Nanjing, China

Dong Cai

Jiangsu Police Institute, Department of Public Order Management, Nanjing, China

J. Appl. Remote Sens. 11(1), 016032 (Feb 24, 2017). doi:10.1117/1.JRS.11.016032
History: Received November 2, 2016; Accepted February 7, 2017
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Abstract.  Filtering of airborne laser scanning (ALS) point clouds into ground and nonground points is a core postprocessing step for ALS data. A hierarchical filtering method, which has high operating efficiency and accuracy because of the combination of multiscale morphology and progressive triangulated irregular network (TIN) densification (PTD), is proposed. In the proposed method, the grid is first constructed for the ALS point clouds, and virtual seed points are set by analyzing the shape and elevation distribution of points within the grid. Then, the virtual seed points are classified as ground or nonground using the multiscale morphological method. Finally, the virtual ground seed points are utilized to generate the initial TIN, and the filter is completed by iteratively densifying the initial TIN. We used various ALS data to test the performance of the proposed method. The experimental results show that the proposed filtering method has strong applicability for a variety of landscapes and, in particular, has lower commission error than the classical PTD filtering method in urban areas.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Xiaoqiang Liu ; Yanming Chen ; Liang Cheng ; Mengru Yao ; Shulin Deng, et al.
"Airborne laser scanning point clouds filtering method based on the construction of virtual ground seed points", J. Appl. Remote Sens. 11(1), 016032 (Feb 24, 2017). ; http://dx.doi.org/10.1117/1.JRS.11.016032


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