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Open AccessArticle

Identification and Extraction of Geomorphological Features of Landslides Using Slope Units for Landslide Analysis

1
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi′an 710069, China
2
Institute of civil engineering, Zhongyuan University of Technology, Zhengzhou 450007, China
3
National Meteorological Center, China Meteorological Administration, Beijing 100081, China
4
Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
5
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(4), 274; https://doi.org/10.3390/ijgi9040274
Received: 1 March 2020 / Revised: 8 April 2020 / Accepted: 17 April 2020 / Published: 22 April 2020
A slope unit is commonly used as calculation unit for regional landslide analysis. However, the capacity of the slope unit to reflect the geomorphological features of actual landslides still needs to be verified. This is because such accurate representation is critical to ensure the physical meaning of results from subsequent landslide stability analysis. This paper presents work conducted on landslides and slope extraction in two areas in China: The Jiangjia Gully area (Yunnan Province) and Fengjie County (Chongqing Municipality). Ground-based light detection and ranging (LiDAR) data are combined with field landslide terrace measurements to allow for the comparison of slope unit extraction methods (conventional vs. MIA-HSU) in terms of their ability to reflect the geomorphological features of shallow and deep-seated landslides. The results indicate that slope unit boundaries extracted by the conventional method do not match the geomorphological variations of actual landslides, and the method is therefore deficient in meaningfully extracting slope units for further landslide analysis. By contrast, slope units obtained using the MIA-HSU method accurately reflects the geomorphological features of both shallow and deep-seated landslides, and thus provides clearer geomorphological meaning and more reasonable calculation units for regional landslide assessment and prediction. View Full-Text
Keywords: slope unit; MIA-HSU method; landslide; geomorphological features slope unit; MIA-HSU method; landslide; geomorphological features
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Wang, K.; Xu, H.; Zhang, S.; Wei, F.; Xie, W. Identification and Extraction of Geomorphological Features of Landslides Using Slope Units for Landslide Analysis. ISPRS Int. J. Geo-Inf. 2020, 9, 274.

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