Airborne LiDAR Point Cloud Filtering Algorithm Based on Dynamic Threshold

Zhenyang Hui; Tieding Lu; Youjian Hu; Xianyu Yu; Yuanping Xia

doi:10.3788/LOP56.062802

Laser & Optoelectronics Progress, Volume. 56, Issue 6, 062802(2019)

Airborne LiDAR Point Cloud Filtering Algorithm Based on Dynamic Threshold

Zhenyang Hui^1,2, Tieding Lu^2、*, Youjian Hu³, Xianyu Yu⁴, and Yuanping Xia^2,5

¹ Key Laboratory for Digital Land and Resources of Jiangxi Province, East China University of Technology, Nanchang, Jiangxi 330013, China

² Faculty of Geomatics, East China University of Technology, Nanchang, Jiangxi 330013, China

³ Faculty of Information Engineering, China University of Geosciences, Wuhan, Hubei 430074, China

⁴ School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China

⁵ Key Laboratory of Watershed Ecology and Geographical Environment Monitoring, Nanchang, Jiangxi 330013, China

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Figures & Tables(10)

Fig. 1. Flow chart of proposed algorithm

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Fig. 2. Flow chart of second filtering algorithm

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Fig. 3. Three-dimensional image of original point cloud

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Fig. 4. Ground point cloud after first filtering

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Fig. 5. Ground point cloud after second filtering

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Fig. 6. Three-dimensional surfaces of point cloud. (a) Before filtering; (b) after filtering

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Fig. 7. Qualitative analysis of filtering results. (a) Digital surface model of original point cloud; (b) digital elevation model of true groud points; (c) digital elevation model after filtering by proposed algorithm; (d) error distribution of point cloud

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Table 1. Accuracy assessment of filtering%
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Table 1. Accuracy assessment of filtering%
Error type TypeⅠerror TypeⅡerror Total error
First filtering 32.91 6.29 21.56
Second filtering 15.15 12.86 14.23

Table 2. Accuracy comparison among filtering algorithms%

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Table 2. Accuracy comparison among filtering algorithms%

Filtering algorithm	Elmqvist	Sohn	Axelsson	Pfeifer	Brocelli	Roggero	Wack	Sithole	Proposed method
Type Ⅰ error	33.63	20.49	15.96	28.26	62.00	33.16	39.12	37.69	15.25
Type Ⅱ error	4.38	12.17	3.65	2.41	2.53	3.88	3.38	3.49	12.86
Total error	22.40	20.49	10.76	17.35	36.96	20.80	24.02	23.25	14.23

Table 3. Error comparison of filtering results%

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Table 3. Error comparison of filtering results%

Sample	TerraScan			Proposed method
Sample	TypeⅠerror	TypeⅡerror	Total error	TypeⅠerror	TypeⅡerror	Total error
12	21.49	1.12	11.55	7.57	7.21	7.39
21	14.30	1.95	11.56	8.13	6.15	7.70
22	14.51	2.56	10.78	2.23	17.02	6.80
23	12.92	2.54	8.01	4.55	17.33	10.60
24	16.38	3.98	12.97	7.29	19.78	10.68
31	8.36	8.97	4.85	7.07	14.61	10.53
41	25.10	0.74	13.15	14.75	16.08	15.42
42	8.00	1.39	2.55	9.37	4.78	6.12
51	0.41	0.29	1.13	0.49	18.92	4.48
52	4.72	4.52	5.38	4.33	21.91	6.22
53	3.62	11.01	4.02	7.00	18.02	9.44
54	2.49	13.68	2.30	4.43	10.99	7.91
61	1.60	4.81	1.71	3.41	7.21	4.54
71	1.69	3.56	1.90	3.91	10.26	7.07

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Zhenyang Hui, Tieding Lu, Youjian Hu, Xianyu Yu, Yuanping Xia. Airborne LiDAR Point Cloud Filtering Algorithm Based on Dynamic Threshold[J]. Laser & Optoelectronics Progress, 2019, 56(6): 062802

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