激光与光电子学进展, 2014, 51 (10): 102801, 网络出版: 2014-09-22
一种用于机载LiDAR波形数据高斯分解的高斯拐点匹配法 下载: 642次
A Gaussian Inflexion Points Matching Method for Gaussian Decomposition of Airborne LiDAR Waveform Data
遥感 机载激光雷达 波形分析 高斯分解 高斯拐点匹配法 全波形数据 remote sensing airborne LiDAR waveform analysis Gaussian decomposition Gaussian inflexion points matching method full-waveform data
摘要
针对小光斑全波形机载激光雷达(LiDAR)波形数据高斯分解法的核心问题——高斯分量个数估计,提出一种高斯拐点匹配法。该算法用平面曲线离散点集拐点的快速查找算法检测波形数据中的拐点,计算过检测出的拐点及其右边第一个点的直线的斜率,根据斜率将所有检测出的拐点分为左、右拐点,一个左拐点与其邻近的一个右拐点组成一个高斯分量,据此可以确定波形数据中高斯分量个数。采用高斯拐点匹配法对模拟和实测波形数据进行分解,并与传统的脉冲检测方法(重心法和高斯脉冲拟合法)相比。结果表明,高斯拐点匹配法方法能极大地减小伪拐点的影响,快速、准确地检测并分解出波形数据中高斯分量,提高波形数据分解速度。同时其能分解出更多的高斯分量,从而提高点云密度。
Abstract
Estimation of Gaussion components′ number is a core problem in the procedure of Gaussian decomposition of small- footprint full- waveform airborne LiDAR waveform data. A new approach named Gaussian inflexion points matching method (GIPM) is proposed to solve it. GIPM algorithm uses the quick locating algorithm for turning points in discrete point set of plane curve (QLATP) method for detecting the inflexion points (IFPs). The slope of the line between the detected IFP and its adjacent point is calculated. The detected IFPs are classified as left IFPs and right IFPs according to the slope. A left IFP and its neighboring right IFP comprise a Gaussian component, thus getting the number of the Gaussian components of waveform data. GIPM method is used to decompose the simulated and the measured waveform data, comparing with two traditional pulses detection method (center of gravity and Gaussian pulse fitting). The results demonstrate that the GIPM method can tremendously retain the impact of the pseudo IFPs, and quickly and accurately detect and decompose Gaussian components of the waveform data, and then immensely speed up the decomposition of waveform data. Meanwhile, it can get more Gaussian components than others, thus improving the density of point cloud.
段乙好, 张爱武, 刘诏, 王书民, 王京萌, 叶秋虹. 一种用于机载LiDAR波形数据高斯分解的高斯拐点匹配法[J]. 激光与光电子学进展, 2014, 51(10): 102801. Duan Yihao, Zhang Aiwu, Liu Zhao, Wang Shumin, Wang Jingmeng, Ye Qiuhong. A Gaussian Inflexion Points Matching Method for Gaussian Decomposition of Airborne LiDAR Waveform Data[J]. Laser & Optoelectronics Progress, 2014, 51(10): 102801.