基于LiDAR高度纹理和神经网络的地物分类  

Land cover classification using LiDAR height texture and ANNs

作　　者：乔纪纲[1,2] 刘小平[1] 张亦汉[1] 

机构地区：[1]中山大学地理科学与规划学院遥感与地理信息工程系,广东广州510275 [2]广东商学院资源与环境学院,广东广州501320

出　　处：《遥感学报》2011年第3期539-553,共15页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:40901187);广东省自然科学基金资助项目(编号:9451027501002471)~~

摘　　要：使用LiDAR单一数据进行点云分割工作时,基于斜率的严格分割LiDAR点云的方法不能很好的适应复杂地物的分类工作。本文将LiDAR粗分割后的点云转换为高度图像和反射强度图像,并求取高度图像GLCM高度纹理。将4种GLCM高度纹理、地面粗糙系数、平均高度和平均反射强度共7种纹理作为识别地面覆盖物的特征,并利用后向传播神经网络(BP-ANN)方法对LiDAR数据进行地物识别。实验表明,这种方法能够从LiDAR独立数据源中有效的实现地物分类,实验获得的精度大于90%。与传统的最大似然法进行对比,BP-ANN的分类精度高于最大似然法。当预设地面类型能同时满足被光学影像和LiDAR数据识别的条件时,LiDAR高度纹理分类与光学影像分类结果的一致性达到76.5%。The method of strict slope threshold algorithm is not sufficient to achieve complex object identification or ground features classification from LiDAR data.In this research,artificial intelligence is used to classify the ground features based on the LiDAR height texture.Average elevation image,average intensity image and ground roughness index image are derived from LiDAR points.Then,4 GLCM texture features including entropy,various,second moment and homogeneity texture are measured.Finally,BP-ANNs are used to classify the texture measure into five ground feature types.A coastal area of Zhujiang Delta,South of China,is taken as the study area.The method employed in this research can efficiently work with single LiDAR data source and the accuracy of classification result is 90%,and the classification accuracy of Maximal Likelihood method（ML） is 86.8% for comparison.When the result of ANNs classification is compared with the result of optical image classification,it can be found that 76.5% sample points are in accord.

关 键 词：LIDAR 高度纹理 人工神经网络 地面粗糙度 分类 

分 类 号：P237[天文地球—摄影测量与遥感]