A New Method for Gully Detection on High-Resolution Digital Elevation Models

Jun-Ping Zhao; Shen Yu Hsiao

Presentation information

[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT49] GEOSCIENTIFIC APPLICATIONS OF HIGH-DEFINITION TOPOGRAPHY AND GEOPHYSICAL DATA IN THE ANTHROPOCENE

convener:Yuichi S. Hayakawa(Faculty of Environmental Earth Science, Hokkaido University), Shigekazu Kusumoto(Graduate School of Science and Engineering for Research, University of Toyama), Christopher A Gomez(Kobe University Faculty of Maritime Sciences Volcanic Risk at Sea Research Group)

[MTT49-05] A New Method for Gully Detection on High-Resolution Digital Elevation Models

*Jun-Ping Zhao¹, Shen Yu Hsiao¹ (1.National Chung Hsing University)

Keywords:Gully-Identifying Method, Topographic Position Index, Gully, LiDAR

This research focuses on detecting exact gully locations on high-resolution terrains using a new method -- Gully Identifying Method (GIM). The high-resolution terrains tested in this study include: (1) a simulated Digital Elevation Model (DEM), and (2) a real DEM produced by airborne LiDAR system. The spatial resolutions of two DEMs are both 1 m. The study area is located at the watershed of Deji Reservoir, Taichung, Taiwan. The GIM is used to test the ability of detecting gullies both on the simulated and real DEMs, and the results are compared to those from the traditional method --Topographic Position Index (TPI). Both results are verified with aerial photographs, remote sensing images, red-relief maps and field inspections. This research shows that the GIM is more advantageous than the TPI in gully detection.