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The influence of cartographic representation on landslide susceptibility models: empirical evidence from a Brazilian UNESCO world heritage site

Author

Listed:
  • Jefferson Alves Araujo Junior

    (Federal University of Ouro Preto)

  • Cesar Falcão Barella

    (Federal University of Ouro Preto)

  • Cahio Guimarães Seabra Eiras

    (Federal University of Ouro Preto)

  • Larissa Flávia Montandon

    (Geological Survey of Brazil)

  • Alberto Fonseca

    (Federal University of Ouro Preto)

Abstract

The influence of cartographic representation of landslides on susceptibility models is well-known but often neglected by academic studies, which rarely explore its practical implications. This study aims to address this knowledge gap by evaluating the impact of different landslide sampling strategies on statistical models of landslide susceptibility in Ouro Preto, a UNESCO World Heritage Site located in South-eastern Brazil. The study’s main objective was to assess how different landslide sampling strategies affected statistical susceptibility models. It adopted an innovative methodological approach that categorized dependent variables between training and test subgroups, adopting both balanced and unbalanced divisions of dependent variables, and focusing on shallow and deep landslides. In addition, the study introduced a systematic and critical approach to cartographic representation, providing valuable insights for future research and practice on landslide susceptibility mapping. Eighteen models were produced using an inventory with 57 historical landslides mapped with an Unmanned Aerial Vehicle. The area and volume of these landslides were determined. Three divisions of dependent variables were adopted between training and test subgroups: one balanced division, with large and deep landslides in both subgroups, and two unbalanced divisions, with a predominance of large and deep landslides in the training subgroup or test subgroup. The construction of landslide susceptibility models employed the information value method, validated through success and prediction curves. The results show the significant influence of cartographic representation (point or polygon) on the quality of statistical models and the spatial distribution of susceptibility classes. The polygonal cartographic representation and balanced partition of dependent variables produced the best results. However, it is emphasized that this cartographic representation is not universally optimal in other contexts. The worst result was obtained using a point and random cartographic representation. Overall, findings indicate the need for more accurate landslide inventories and databases, possibly through standards and regulations.

Suggested Citation

  • Jefferson Alves Araujo Junior & Cesar Falcão Barella & Cahio Guimarães Seabra Eiras & Larissa Flávia Montandon & Alberto Fonseca, 2024. "The influence of cartographic representation on landslide susceptibility models: empirical evidence from a Brazilian UNESCO world heritage site," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 120(11), pages 9527-9550, September.
    • Handle: RePEc:spr:nathaz:v:120:y:2024:i:11:d:10.1007_s11069-024-06576-3
    DOI: 10.1007/s11069-024-06576-3
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    References listed on IDEAS

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    1. Hamid Reza Pourghasemi & Amiya Gayen & Sungjae Park & Chang-Wook Lee & Saro Lee, 2018. "Assessment of Landslide-Prone Areas and Their Zonation Using Logistic Regression, LogitBoost, and NaïveBayes Machine-Learning Algorithms," Sustainability, MDPI, vol. 10(10), pages 1-23, October.
    2. Cahio Guimarães Seabra Eiras & Juliana Ribeiro Gonçalves de Souza & Renata Delicio Andrade de Freitas & César Falcão Barella & Tiago Martins Pereira, 2021. "Discriminant analysis as an efficient method for landslide susceptibility assessment in cities with the scarcity of predisposition data," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 107(2), pages 1427-1442, June.
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