Terrain visibility impact on the preparation of landslide inventories: a practical example in Darjeeling district (India)
Terrain visibility impact on the preparation of landslide inventories: a practical example in Darjeeling district (India)
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DOI：
10.5194/nhess-22-2929-2022
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发表时间：
2022-09-06
影响因子：
4.6
通讯作者：
Mondini, Alessandro
中科院分区：
文献类型：
--
作者：
Bornaetxea, Txomin;Marchesini, Ivan;Mondini, Alessandro
滑坡清单用于多种目的，包括景观特征和监测，以及滑坡敏感性，危害和风险评估。其质量和完整性取决于数据和编制方法。在这项工作中，我们评估了可变的可见度的领土地图上的空间分布的信息收集在不同的滑坡库存准备使用不同的方法在一个研究领域的影响。该方法首先将领土划分为不同能见度水平的地区，这些地区来自用于绘制滑坡图的路径（道路），然后估计库存中报告的不同能见度等级的滑坡密度。我们的研究结果表明，（1）信息的密度是密切相关的，通过实地调查，技术报告和/或报纸，在低能见度地区的滑坡采样不足，库存获得的能见度;和（2）通过照片判读图像获得的库存遭受从一个显着的代表性不足的小型滑坡接近道路或基础设施。我们认为，建议的程序可以是有用的，以评估滑坡库存的质量和完整性，然后正确地定位其使用。
Landslide inventories are used for multiple purposes including landscape characterisation and monitoring, and landslide susceptibility, hazard and risk evaluation. Their quality and completeness can depend on the data and the methods with which they were produced. In this work we evaluate the effects of a variable visibility of the territory to map on the spatial distribution of the information collected in different landslide inventories prepared using different approaches in a study area. The method first classifies the territory in areas with different visibility levels from the paths (roads) used to map landslides and then estimates the landslide density reported in the inventories into the different visibility classes. Our results show that (1) the density of the information is strongly related to the visibility in inventories obtained through fieldwork, technical reports and/or newspapers, where landslides are under-sampled in low-visibility areas; and (2) the inventories obtained by photo interpretation of images suffer from a marked under-representation of small landslides close to roads or infrastructures. We maintain that the proposed procedure can be useful to evaluate the quality and completeness of landslide inventories and then properly orient their use.