The Effect of the Normalized Difference Vegetation Index to Landslide Susceptibility using Optical Imagery Sentinel 2 and Landsat 8
L. Doan Viet, C. Nguyen Chi, Chre ́tien, D. Nguyen Quoc
Abstract
Summary Landside is a natural hazard which is described as a movement of materials from upslope to downslope under the effect of gravity caused by numerous natural factors and anthropogenetic factors. In Vietnam, landslide occurs mainly in the rainy season and land-covers can be seen as the factor that reduce the impact of rainfall to slope, and thereby helping to improve the stability of the area. This paper used optical imagery Sentinel 2 and Landsat 8 to derive NDVI index at the beginning of every rainy season from 2013 to 2020. The landslide events that uccured in rainy season are then collected to evaluate the influence of the NDVI index using frequency ratio method and other statistical indicators analysis. The mountatinous of Quang Ngai province where the landslides uccurs every year is selected as a case study of this paper. The result shows significantly influence of NDVI index to landslide inventory. This study also recommends the use of updated NDVI map to predict the landslide susceptibility.