摘要
滤波是机载激光扫描的核心处理步骤之一,其主要任务是分离地面点和非地面点。经典渐进式不规则三角网致密化(Progressive TIN Densification)在众多滤波算法中效果较好、精度较高,但是PTD滤波算法阈值确定需要人工干预,无法满足自适应滤波。本文针对关键格网参数阈值提出等值线确定方法,利用等值线的连续性、闭合性,根据建筑物同一边缘区域的明显高差来确定最大建筑面积与格网的参数阈值。实验证明通过等值线确定的面积与格网参数阈值对于具有建筑物的复杂地形有着更好的滤波效果。
Filtering is one of the core processing steps for airborne laser scanning,Its main task is to separate ground and non-ground points.Classic Progressive TIN Densification has better effect and higher precision in many filtering algorithms,However,the threshold determination of the PTD filtering algorithm requires manual intervention and cannot satisfy the adaptive filtering.In this paper,the contour determination method is proposed for the critical grid parameter threshold.Using the continuity and closure of the contour,the maximum building area and grid parameter threshold are determined according to the obvious height difference of the same edge area of the building.The experimental show that the area determined by the contour and the grid parameter threshold have better filtering effect in the complex terrain with buildings.
作者
朱磊
邓兴升
邢承滨
Zhu Lei;Deng Xingsheng;Xing Chengbin(School of Trans portation Engineering,Changsha Universily of Srience and Technology,Changsha,Hunan 410004,China)
出处
《应用激光》
CSCD
北大核心
2020年第2期336-341,共6页
Applied Laser
基金
教育厅资助科研项目(项目编号:17B004)。
