| 机载LiDAR地形特征信息快速提取 |
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| 引用本文： | 刘智敏,杨安秀,宿殿鹏,刘 盼.机载LiDAR地形特征信息快速提取[J].大地测量与地球动力学,2018,38(11):1186-1190. |
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| 作者姓名： | 刘智敏 杨安秀 宿殿鹏 刘 盼 |
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| 摘 要： | 为更有效地获取地形特征信息，提出一种机载LiDAR地形特征信息快速提取算法。首先，通过构建二次曲面拟合模型，建立实测LiDAR地形数据与拟合曲面的几何规则；然后，采用LM算法迭代参数寻优，获得最优化结果下的地形拟合参数，计算拟合时间及拟合精度；最后，以地形拟合模型为基础，进行地形特征信息的快速提取。通过机载LiDAR实测数据验证，当最优搜索半径为2 m时，地形曲面的拟合时间仅为0.02 s，RMSE仅为5.09 cm。该算法保证了地形特征信息提取效率和精度，能够有效满足机载LiDAR科学研究和工程应用的技术需求。
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| 关 键 词： | 机载LiDAR LM拟合 曲率 粗糙度 坡度 |
Terrain Features Rapid Extraction of Airborne LiDAR |
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| LIU Zhimin,YANG Anxiu,SU Dianpeng,LIU Pan.Terrain Features Rapid Extraction of Airborne LiDAR[J].Journal of Geodesy and Geodynamics,2018,38(11):1186-1190. |
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| Authors: | LIU Zhimin YANG Anxiu SU Dianpeng LIU Pan |
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| Abstract: | Terrain features play an important role in cartography, earthquake geology, terrain classification and DEM production. In order to obtain terrain features more effectively, a rapid terrain features extraction algorithm of airborne LiDAR is proposed in this paper. Firstly, constructing the quadric surface fitting model, the geometric rules of airborne LiDAR data and fitting model are established. Then, the LM(levenberg-marquardt) algorithm is adopted to optimize the parameters of the topography and obtain the optimal results. In addition, the fitting time and fitting precision are calculated. Finally, the terrain features are extracted rapidly based on the terrain fitting model. To verify the algorithm’s efficiency and accuracy, the airborne LiDAR experiment indicates that when the optimal search radius is 2 m, the fitting time is only 0.02 s and RMSE is only 5.09 cm. |
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| Keywords: | airborne LiDAR levenberg-marquardt fitting curvature roughness slope |
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