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In this study, a LIDAR laser scanner was used to scan a rock slope around Mt. Gwanak and to produce point cloud from which directional information of rock joint surfaces shall be extracted. It was analyzed using two different algorithms, i.e. Ball Pivoting and Wrap algorithm, and four sampling intervals, i.e. raw, 2, 5, and 10 cm. The results of Fuzzy K-mean clustering were analyzed on the stereonet. As a result, the Ball Pivoting and Wrap algorithms were considered suitable for extraction of rock surface orientation. In the case of 5 cm sampling interval, both triangulation algorithms extracted the most number of the patch and patched area.Key words Point cloud, Triangulation, Orientation extraction, Sampling interval    LIDAR                        .      Ball Pivoting, Wrap         , 2, 5, 10 cm            K-        .   Delaunay   Ball Pivoting, Wrap        ,   5 cm  Ball Pivoting, Wrap              . LIDAR, , , ,   ,

A Study on the Extraction of Slope Surface Orientation using LIDAR with respect to Triangulation Method and Sampling on the Point Cloud