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http://dx.doi.org/10.11108/kagis.2011.14.3.174

Development of the Topography Restoration Method for Debris Flow Area Using Airborne LiDAR Data  

Woo, Choong-Shik (Division of Forest Disaster Management, Korea Forest Research Institut)
Youn, Ho-Joong (Division of Forest Disaster Management, Korea Forest Research Institut)
Lee, Chang-Woo (Division of Forest Disaster Management, Korea Forest Research Institut)
Lee, Kyu-Sung (Department of Geoinformatic Engineering, Inha University)
Publication Information
Journal of the Korean Association of Geographic Information Studies / v.14, no.3, 2011 , pp. 174-187 More about this Journal
Abstract
The flowed soil is able to be estimated from topographic data of before and after the debris flow. However, it is often difficult to obtain airborne LiDAR data before the debris flow area. Thus, this study tries to develop a topographic restoration method that can provide spatial distribution of flowed soil and reconstruct the topography before the debris flow using airborne LiDAR data. The topographic restoration method can express a numerical formula induced from a Gaussian mixture model after extracting the cross sections of linear or non-linear in debris flowed area. The topographic restoration method was verified by two ways using airborne LiDAR data of before and after the debris flow. First, each cross section extracted from the debris flow sites to restore the topography was compared with airborne LiDAR data of before the debris flow. Also, the topographic data produced after the topographic restoration method applied to the debris flow sites was verified by airborne LiDAR DEM. Verifying the results of the topographic restoration method, overall fitting accuracy showed high accuracy close to 0.5m.
Keywords
LiDAR; Debris Flow; Topography Restoration; Gaussian Mixture Model; DEM;
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