利用LiDAR数据提取山谷(脊)线的关键技术研究

Research on Key Technologies of Extracting Valley and Ridge Lines with LiDAR Data

在分析利用LiDAR数据提取山谷(脊)线关键步骤的基础上,针对传统三维流水模拟方法采用单一汇水量阈值提取山谷(脊)线所存在的无法提取既完整又可靠的山谷(脊)线的局限,提出了动态设定汇水量阈值的模型。在实验中,采用正交测试法对动态阈值模型的参数取值进行测试,得到了较合理参数值,实验结果表明,采用动态阈值能够提取更准确的山谷(脊)线。

After the key steps of extracting valley（or ridge） lines by analyzing and using LiDAR data,a model of catchment threshold value set up dynamically was proposed according to some limitations existed in traditional 3 D running water simulation in which the complete and highly reliable valley（or ridge） lines could not be extracted with single catchment threshold value.A group of reasonable parameter values of dynamic threshold model were obtained by orthogonal test method.The experiment results show that more precise valley（or ridge） lines can be extracted by using dynamic threshold values.