%0 Journal Article
%T Filtering method of LIDAR data based on contours<br>基于等高线的表面估计滤波方法
%A REN Zi-zhen
%A <br>任自珍
%J 遥感学报
%D 2009
%I 
%X Filtering is an importantmethod to extractdigital terrainmodel(DTM) form LightDetection and Ranging(LIDAR) data and hasmade some good effects in application, but existing filtering methods are deficiency in certain applications, especially unsuitable forundulated terrain. In this paper, a new filteringmethodwhich is based on contours is developed. Themethodmainly consists of three steps: Firstly, digital surfacemodel (DSM) is generated from raw LIDAR data by surface interpolationmethods, such as the nearest neighbor interpolation method, and then contours ofDSM are generated. Secondly, these DSM contours are separated into three groups: ground contour, which only consists ofpoints on ground; objectcontour, which only consists ofpoints off-ground, such as on trees or roofs; andmixing contour, which consists of points on ground or off-ground. According to some properties of contours, including closeness, start-to-end distance, length of curve, denseness, ground contours and ground contour section ofmixing contours are extracted and then some ground points are obtained, finally an initial approximation of theDTM is determined by interpolating those ground points. Then a refinedDTM is obtained by an iterativemethod: comparing the approximate DTM with the originalDSM and if the difference is below a predefined threshold the originalDSM points are selected andmade into DTM data points. Otherwise, the location ismarked as no data; and then the no data points are interpolated using the selectedDSM data. Comparisons between initial and refined DTM obtained by methods proposed previously is done. To calculate the accurate probability, the objects obtained by new filter is compared with standard objects obtained from aerial images manually. All the experimental results show that the proposed method is a simple and practical one needing little calculation, and can be used in undulating terrain area.
%K LIDAR
%K filtering
%K contours
%K DSM
%K DTM<br>激光雷达
%K 滤波
%K 等高线
%K 数字表面模型
%K 数字地面模型
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=A41A70F4AB56AB1B&jid=F926358B31AC94511E4382C083F7683C&aid=E36F230E5506291C85238E6FAD8269C0&yid=DE12191FBD62783C&vid=FC0714F8D2EB605D&iid=CA4FD0336C81A37A&journal_id=1007-4619&journal_name=遥感学报&referenced_num=0&reference_num=12