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Remote Sensing for Assessing Landslides and Associated Hazards

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Abstract

Multi-platform remote sensing using space-, airborne and ground-based sensors has become essential tools for landslide assessment and disaster-risk prevention. Over the last 30 years, the multiplicity of Earth Observation satellites mission ensures uninterrupted optical and radar imagery archives. With the popularization of Unmanned Aerial Vehicles, free optical and radar imagery with high revisiting time, ground and aerial possibilities to perform high-resolution 3D point clouds and derived digital elevation models, it can make it difficult to choose the appropriate method for risk assessment. The aim of this paper is to review the mainstream remote-sensing methods commonly employed for landslide assessment, as well as processing. The purpose is to understand how remote-sensing techniques can be useful for landslide hazard detection and monitoring taking into consideration several constraints such as field location or costs of surveys. First we focus on the suitability of terrestrial, aerial and spaceborne systems that have been widely used for landslide assessment to underline their benefits and drawbacks for data acquisition, processing and interpretation. Several examples of application are presented such as Interferometry Synthetic Aperture Radar (InSAR), lasergrammetry, Terrestrial Optical Photogrammetry. Some of these techniques are unsuitable for slow moving landslides, others limited to large areas and others to local investigations. It can be complicated to select the most appropriate system. Today, the key for understanding landslides is the complementarity of methods and the automation of the data processing. All the mentioned approaches can be coupled (from field monitoring to satellite images analysis) to improve risk management, and the real challenge is to improve automatic solution for landslide recognition and monitoring for the implementation of near real-time emergency systems.

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Acknowledgements

This paper is a result of the international workshop on “Natural and man-made hazards monitoring by the Earth Observation missions: current status and scientific gaps” held at the International Space Science Institute (ISSI), Bern, Switzerland, on April 15–18, 2019. We thank all the authors for their contribution in this article with the result of their researches. The repeated surveys in Normandy, are supported by the ANR Project “RICOCHET: multi-RIsk assessment on Coastal territory in a global CHange context” funded by the French Research National Agency (ANR-16-CE03-0008). Permafrost researches benefited from Nunataryuk Project (H2020 Research and Innovation Programme under Grant Agreement No. 773421), ESA DUE GlobPermafrost Project (4000116196/15/I–NB) as well as ESA Climate Change Initiative Project on Permafrost (4000123681/18/I-NB).

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Correspondence to Candide Lissak.

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Lissak, C., Bartsch, A., De Michele, M. et al. Remote Sensing for Assessing Landslides and Associated Hazards. Surv Geophys 41, 1391–1435 (2020). https://doi.org/10.1007/s10712-020-09609-1

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  • DOI: https://doi.org/10.1007/s10712-020-09609-1

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