标题: An Adaptive Surface Interpolation Filter Using Cloth Simulation and Relief Amplitude for Airborne Laser Scanning Data
作者: Li, F (Li, Feng); Zhu, HH (Zhu, Haihong); Luo, ZW (Luo, Zhenwei); Shen, H (Shen, Hang); Li, L (Li, Lin)
来源出版物: REMOTE SENSING 卷: 13 期: 15 文献号: 2938 DOI: 10.3390/rs13152938 出版年: AUG 2021
摘要: Separating point clouds into ground and nonground points is an essential step in the processing of airborne laser scanning (ALS) data for various applications. Interpolation-based filtering algorithms have been commonly used for filtering ALS point cloud data. However, most conventional interpolation-based algorithms have exhibited a drawback in terms of retaining abrupt terrain characteristics, resulting in poor algorithmic precision in these regions. To overcome this drawback, this paper proposes an improved adaptive surface interpolation filter with a multilevel hierarchy by using a cloth simulation and relief amplitude. This method uses three hierarchy levels of provisional digital elevation model (DEM) raster surfaces with thin plate spline (TPS) interpolation to separate ground points from unclassified points based on adaptive residual thresholds. A cloth simulation algorithm is adopted to generate sufficient effective initial ground seeds for constructing topographic surfaces with high quality. Residual thresholds are adaptively constructed by the relief amplitude of the examined area to capture complex landscape characteristics during the classification process. Fifteen samples from the International Society for Photogrammetry and Remote Sensing (ISPRS) commission are used to assess the performance of the proposed algorithm. The experimental results indicate that the proposed method can produce satisfying results in both flat areas and steep areas. In a comparison with other approaches, this method demonstrates its superior performance in terms of filtering results with the lowest omission error rate; in particular, the proposed approach retains discontinuous terrain features with steep slopes and terraces.
作者关键词: ground filtering; airborne laser scanning; point clouds; relief amplitude; adaptive residual thresholds; cloth simulation; thin plate spline
KeyWords Plus: LIDAR POINT CLOUDS; GROUND POINTS; MORPHOLOGICAL FILTER; DEM GENERATION; URBAN AREAS; ALGORITHM; MODELS; DENSIFICATION; SEGMENTATION; EXTRACTION
地址: [Li, Feng; Zhu, Haihong; Luo, Zhenwei; Shen, Hang; Li, Lin] Wuhan Univ, Sch Resource & Environm Sci SRES, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
[Zhu, Haihong; Li, Lin] Wuhan Univ, SRES, Inst Smart Percept & Intelligent Comp, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯作者地址: Li, L (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci SRES, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
Li, L (通讯作者)，Wuhan Univ, SRES, Inst Smart Percept & Intelligent Comp, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
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