The effect of spatial resolution on the accuracy of landslide susceptibility mapping: a case study in Boun, Korea

다국어 초록 (Multilingual Abstract)

The authors have evaluated the effect of spatial res-olution on the accuracy of landslide susceptibility mapping. Forthis purpose, landslide locations were identified from the interpre-tation of aerial photographs and field surveys in the Boun regionof Korea. Topography, soil, forest, geological, lineament and land-database using GIS and remote sensing data. The 15 factors thatinfluenced landslide occurrence were extracted and calculatedfrom the spatial database at 5, 10, 30, 100 and 200 m spatial res-olution. Hazardous landslide areas were analyzed and mappedusing the landslide-occurrence factors by employing a probabilitymodels frequency ratio for the five spatial resolutions. The resultsof the analysis were verified using the landslide location data andarea under success rate curve. The spatial resolutions of 5, 10 and30 m showed similar results (the normalized area values 0.97, 1.00and 0.92, respectively), but the 100 and 200 m spatial resolutionsshowed less well-verified data (the normalized area values 0.48,1:5,000-1:50,000, the 5, 10 and 30 m spatial resolutions had a sim-ilar accuracy, but the 100 and 200 m spatial resolutions had alower accuracy. From this, we conclude that spatial resolution hasan effect on the accuracy of landslide susceptibility, as it is depen-dent on the input map. At least, less than 30 m resolution is needfor landslide analysis in Korea where most of map scale is in therange 1:5,000-1:50,000.

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