Abstract
Laser scanner has been receiving more attention as a useful tool for real-time 3D data acquisition, and many applications such as city modeling, DTM generation, monitoring electrical power lines and detection of forest areas were proposed. However, effective filtering for distinguish on- and off-terrain points from point cloud 3D data collected by airborne laser scanner is still issues.The paper describes a robust filtering method from a view point of topographic surveying using a terrestrial laser scanner. The method is based on flatness within 0.3×0.3m. Flat area (ground surface, wall of buildings, etc.) and non-flat area (trees, bushes, windows, sky, etc.) are classified using surface flatness, and non-flat areas are interpolated using morphological procedure. The filtering methods show very robust results, and the most remarkable point of this filtering method is its ability to obtain break-line.
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