Articles | Volume 22, issue 9
https://doi.org/10.5194/nhess-22-2929-2022
https://doi.org/10.5194/nhess-22-2929-2022
Research article
 | 
06 Sep 2022
Research article |  | 06 Sep 2022

Terrain visibility impact on the preparation of landslide inventories: a practical example in Darjeeling district (India)

Txomin Bornaetxea, Ivan Marchesini, Sumit Kumar, Rabisankar Karmakar, and Alessandro Mondini

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Cited articles

Bera, S., Guru, B., and Ramesh, V.: Evaluation of landslide susceptibility models: A comparative study on the part of Western Ghat Region, India, Remote Sens. Appl. Soc. Environ., 13, 39–52, https://doi.org/10.1016/j.rsase.2018.10.010, 2019. 
Bornaetxea, T. and Marchesini, I.: r.survey: a tool for calculating visibility of variable-size objects based on orientation, Int. J. Geogr. Inf. Sci., 36, 429–452, https://doi.org/10.1080/13658816.2021.1942476, 2021. 
Bornaetxea, T., Rossi, M., Marchesini, I., and Alvioli, M.: Effective surveyed area and its role in statistical landslide susceptibility assessments, Nat. Hazards Earth Syst. Sci., 18, 2455–2469, https://doi.org/10.5194/nhess-18-2455-2018, 2018. 
Brenning, A., Schwinn, M., Ruiz-Páez, A. P., and Muenchow, J.: Landslide susceptibility near highways is increased by 1 order of magnitude in the Andes of southern Ecuador, Loja province, Nat. Hazards Earth Syst. Sci., 15, 45–57, https://doi.org/10.5194/nhess-15-45-2015, 2015. 
Cascini, L.: Applicability of landslide susceptibility and hazard zoning at different scales, Eng. Geol., 102, 164–177, https://doi.org/10.1016/j.enggeo.2008.03.016, 2008. 
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Short summary
One cannot know if there is a landslide or not in an area that one has not observed. This is an obvious statement, but when landslide inventories are obtained by field observation, this fact is seldom taken into account. Since fieldwork campaigns are often done following the roads, we present a methodology to estimate the visibility of the terrain from the roads, and we demonstrate that fieldwork-based inventories are underestimating landslide density in less visible areas.
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