Abstract
Previous studies on optical remote sensing mapping of landslides mainly focused on new landslides that have occurred, but little attention was paid to the early landslide due to its high concealment. InSAR technology, a prevalent method to detect early landslides, only can be used to identify the potential hazards of slow deformation. Therefore, it is necessary to explore new method of early landslides mapping by integrating all types of direct and indirect early features, such as cracks on slopes, small collapses inside and topographic features. In this study, an object-oriented image analysis method based on slope unit division and multi-scale segmentation was proposed to obtain accurate location and boundary extraction of early landslides. In the middle- and small-scale segmentation, the object, texture, spectrum, geometric features, topographic features, and other features were obtained to determine the local feature location of early landslides. The slope unit boundary was combined with the feature of a large-scale segmentation object to determine the scope of landslides. This method was tested in the Xianshui River basin in the Daofu County, Sichuan Province, China. The results demonstrate that: (1) Such features as landslide cracks and the small collapse at the bottom of slope can effectively determine the landslide position. (2) The slope unit division and the correct setting of shape factors in multiple segmentation can effectively determine the landslide boundary. (3) The accuracy of landslide location extraction was 83.33%, and the accuracy of boundary extraction for early landslides that were completely identified was evaluated as 82.67%. It is indicated that this method can improve the accuracy of boundary extraction and meet the requirements of the early landslides mapping.
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Acknowledgements
This study was supported by Geological Survey Project of China Geological Survey (No. DD20221635, DD20211386, DD20211392, DD2019064, DD20190033, DD20179603,) and the National Natural Science Foundation of China (No. 92055314).
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Gao, H., He, L., He, Zw. et al. Early landslide mapping with slope units division and multi-scale object-based image analysis — A case study in the Xianshui River basin of Sichuan, China. J. Mt. Sci. 19, 1618–1632 (2022). https://doi.org/10.1007/s11629-022-7333-6
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DOI: https://doi.org/10.1007/s11629-022-7333-6