A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors
With increasing research on geological hazards and the development of geographic information technology, slope units play an increasingly important role in landslide susceptibility assessment and prevention work. The scientific and reasonable division of slope units directly impacts the accuracy and...
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MDPI AG
2024-12-01
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| author | Ping Li Junfu Fan Yujie Du Kuan Li Yuke Zhou |
| author_facet | Ping Li Junfu Fan Yujie Du Kuan Li Yuke Zhou |
| author_sort | Ping Li |
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| description | With increasing research on geological hazards and the development of geographic information technology, slope units play an increasingly important role in landslide susceptibility assessment and prevention work. The scientific and reasonable division of slope units directly impacts the accuracy and practicality of analysis results. Despite the significant progress in slope unit division techniques, most existing methods still have certain limitations, such as a strong dependence on manually set thresholds during the division process, resulting in low levels of automation and efficiency. To address this issue, a new parameter-free slope unit extraction algorithm that integrates terrain factors, called Terrain Factor Parameter-Free Slope Unit Division (TFPF-SU), is introduced. This eliminates the issue of manually setting parameter thresholds during the slope unit division process. This algorithm fully utilizes the terrain information provided by digital elevation models (DEMs) to accurately calculate the curvature, slope, and aspect data for each point. On the basis of the inherent consistency principles among slope, aspect, and curvature, object-oriented image segmentation technology is used to achieve slope unit division. We select Dongchuan District in Yunnan Province, China, as a test area to verify the TFPF-SU algorithm and conduct a detailed comparative analysis and validation of the results with those obtained via traditional hydrological analysis methods from both qualitative and quantitative perspectives. In the quantitative analysis, we utilize the size and shape of the slope units. The results indicate the following: ① the slope units obtained with the TFPF-SU method are more uniform in size, avoiding issues with oversized or irregularly shaped units; ② the slope unit shapes obtained with the TFPF-SU method are more reasonable, with about 70% of the units falling within a reasonable shape index range, compared to only about 32% with the hydrological method; and ③ the slope units produced by the TFPF-SU method align more closely with terrain authenticity, exhibiting a higher degree of topographical conformity. |
| format | Article |
| id | doaj-art-a8515b8ff0a3494e83fbccd6eb4d61b8 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-a8515b8ff0a3494e83fbccd6eb4d61b82024-12-13T16:23:23ZengMDPI AGApplied Sciences2076-34172024-12-0114231127910.3390/app142311279A New Parameter-Free Slope Unit Division Method That Integrates Terrain FactorsPing Li0Junfu Fan1Yujie Du2Kuan Li3Yuke Zhou4School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, ChinaSchool of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, ChinaSchool of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, ChinaSchool of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, ChinaState Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaWith increasing research on geological hazards and the development of geographic information technology, slope units play an increasingly important role in landslide susceptibility assessment and prevention work. The scientific and reasonable division of slope units directly impacts the accuracy and practicality of analysis results. Despite the significant progress in slope unit division techniques, most existing methods still have certain limitations, such as a strong dependence on manually set thresholds during the division process, resulting in low levels of automation and efficiency. To address this issue, a new parameter-free slope unit extraction algorithm that integrates terrain factors, called Terrain Factor Parameter-Free Slope Unit Division (TFPF-SU), is introduced. This eliminates the issue of manually setting parameter thresholds during the slope unit division process. This algorithm fully utilizes the terrain information provided by digital elevation models (DEMs) to accurately calculate the curvature, slope, and aspect data for each point. On the basis of the inherent consistency principles among slope, aspect, and curvature, object-oriented image segmentation technology is used to achieve slope unit division. We select Dongchuan District in Yunnan Province, China, as a test area to verify the TFPF-SU algorithm and conduct a detailed comparative analysis and validation of the results with those obtained via traditional hydrological analysis methods from both qualitative and quantitative perspectives. In the quantitative analysis, we utilize the size and shape of the slope units. The results indicate the following: ① the slope units obtained with the TFPF-SU method are more uniform in size, avoiding issues with oversized or irregularly shaped units; ② the slope unit shapes obtained with the TFPF-SU method are more reasonable, with about 70% of the units falling within a reasonable shape index range, compared to only about 32% with the hydrological method; and ③ the slope units produced by the TFPF-SU method align more closely with terrain authenticity, exhibiting a higher degree of topographical conformity.https://www.mdpi.com/2076-3417/14/23/11279digital elevation modelslope unithydrological methodregion growinglandslide |
| spellingShingle | Ping Li Junfu Fan Yujie Du Kuan Li Yuke Zhou A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors Applied Sciences digital elevation model slope unit hydrological method region growing landslide |
| title | A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors |
| title_full | A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors |
| title_fullStr | A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors |
| title_full_unstemmed | A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors |
| title_short | A New Parameter-Free Slope Unit Division Method That Integrates Terrain Factors |
| title_sort | new parameter free slope unit division method that integrates terrain factors |
| topic | digital elevation model slope unit hydrological method region growing landslide |
| url | https://www.mdpi.com/2076-3417/14/23/11279 |
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