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JDR Vol.16 No.4 pp. 579-587
(2021)
doi: 10.20965/jdr.2021.p0579

Paper:

A Novel Recursive Non-Parametric DBSCAN Algorithm for 3D Data Analysis with an Application in Rockfall Detection

Pitisit Dillon*1,*2,†, Pakinee Aimmanee*1, Akihiko Wakai*3, Go Sato*4, Hoang Viet Hung*5, and Jessada Karnjana*2

*1Sirindhorn International Institute of Technology, Thammasat University
Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand

Corresponding author

*2National Electronics and Computer Technology Center (NECTEC), National Science and Technology Development Agency, Pathum Thani, Thailand

*3Graduate School of Science and Technology, Gunma University, Gumma, Japan

*4Graduate School of Environmental Information, Teikyo Heisei University, Tokyo, Japan

*5Faculty of Civil Engineering, Thuyloi University of Vietnam, Hanoi, Vietnam

Received:
November 30, 2020
Accepted:
April 14, 2021
Published:
June 1, 2021
Keywords:
DBSCAN, divide and conquer, grid density, 3D point cloud, rockfall detection
Abstract

The density-based spatial clustering of applications with noise (DBSCAN) algorithm is a well-known algorithm for spatial-clustering data point clouds. It can be applied to many applications, such as crack detection, rockfall detection, and glacier movement detection. Traditional DBSCAN requires two predefined parameters. Suitable values of these parameters depend upon the distribution of the input point cloud. Therefore, estimating these parameters is challenging. This paper proposed a new version of DBSCAN that can automatically customize the parameters. The proposed method consists of two processes: initial parameter estimation based on grid analysis and DBSCAN based on the divide-and-conquer (DC-DBSCAN) approach, which repeatedly performs DBSCAN on each cluster separately and recursively. To verify the proposed method, we applied it to a 3D point cloud dataset that was used to analyze rockfall events at the Puiggcercos cliff, Spain. The total number of data points used in this study was 15,567. The experimental results show that the proposed method is better than the traditional DBSCAN in terms of purity and NMI scores. The purity scores of the proposed method and the traditional DBSCAN method were 96.22% and 91.09%, respectively. The NMI scores of the proposed method and the traditional DBSCAN method are 0.78 and 0.49, respectively. Also, it can detect events that traditional DBSCAN cannot detect.

Cite this article as:
Pitisit Dillon, Pakinee Aimmanee, Akihiko Wakai, Go Sato, Hoang Viet Hung, and Jessada Karnjana, “A Novel Recursive Non-Parametric DBSCAN Algorithm for 3D Data Analysis with an Application in Rockfall Detection,” J. Disaster Res., Vol.16, No.4, pp. 579-587, 2021.
Data files:
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Last updated on Sep. 21, 2021