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Identification of landslide-prone zones using a GIS-based multi-criteria decision analysis and region-growing algorithm in uncertain conditions

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Abstract

Landslides are considered to be one of the most significant natural hazards. Detection of landslide-prone zones is an important phase in landslide hazard assessment and mitigation of landslide-related losses. AHP as one of the most effective methods for GIS-based multi-criteria decision analysis is increasingly being used in susceptibility mapping. However, its weights have some degree of uncertainty that interval comparison matrix (ICM) method can be used to deal with this problem. The importance of this study is to propose an interval number distance-based region-growing (IDRG) method based on ICM for the identification of landslide-prone zones in the Urmia lake basin, Iran. To assess the capability of the proposed IDRG method, a landslide susceptibility map was produced using common AHP, too. To generate the maps, the weights of nine conditioning factors were determined using both traditional pairwise comparison matrices of the AHP method and ICM. The accuracy of the produced maps was assessed through ROC (receiver operating curve) and using a dataset of known landslide occurrences. The results indicate an improvement in accuracy of about 11% by identifying the landslide-prone zones using the IDRG method. This improvement was achieved by minimizing the uncertainty associated with criteria ranking/weighting in a traditional AHP and identifying the prone zones as areas instead of pixels. Finally, the robustness of the proposed method was demonstrated by sensitivity analysis.

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Notes

  1. Interval number distance.

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Acknowledgements

I appreciate Dr. Bakhtiar Feizizadeh for permission to use the data set used in this manuscript.

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There is no funding source for this research.

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A region-growing method was proposed based on interval number distance to determine the landslide-prone zones. The input map of the algorithm was produced using an interval comparison matrix and the AHP method in which the pixels include interval numbers. The similarity measure was defined considering both the value and uncertainty of the input pixels to specify the homogenous regions.

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Correspondence to Sara Beheshtifar.

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I have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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The raw data in shp file format was provided by Dr. Bakhtiar Feizizadeh, which was previously used in the following paper: (Feizizadeh and Blaschke (2013). GIS-multi-criteria decision analysis for landslide susceptibility mapping: comparing three methods for the Urmia lake basin, Iran. Natural Hazards, 65(3), 2105–2128.)

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Beheshtifar, S. Identification of landslide-prone zones using a GIS-based multi-criteria decision analysis and region-growing algorithm in uncertain conditions. Nat Hazards 115, 1475–1497 (2023). https://doi.org/10.1007/s11069-022-05603-5

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  • DOI: https://doi.org/10.1007/s11069-022-05603-5

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