基于多分辨率方向预测的LIDAR点云滤波方法   总被引：2，自引：0，他引：2  

万幼川  徐景中  赖旭东  张圣望 《武汉大学学报(信息科学版)》2007,32(11):1011-1015

为了快速提取LIDAR点云中的地面点,生成高精度的DTM,提出了一种基于多分辨率方向预测的LIDAR点云滤波方法。该方法首先构建多种分辨率数据集,然后基于方向预测法以分辨率由低到高的顺序逐层进行数据集的平滑处理,最后以最高分辨率数据集的平滑结果为基准标记原始LIDAR点云。本方法通过分析反距离权重插值模型的不足,利用改进的模型进行裸露地面点的插值,得到高精度的DTM。实验表明,本文方法能有效地滤除地物,并保持原有的地形特征,算法效率高,具有一定的实用价值。  相似文献   

Expert-driven semi-automated geomorphological mapping for a mountainous area using a laser DTM   总被引：3，自引：4，他引：3  

S. van Asselen  A.C. Seijmonsbergen 《Geomorphology》2006,78(3-4):309-320

In this paper a semi-automated method is presented to recognize and spatially delineate geomorphological units in mountainous forested ecosystems, using statistical information extracted from a 1-m resolution laser digital elevation dataset. The method was applied to a mountainous area in Austria. First, slope angle and elevation characteristics were determined for each key geomorphological unit occurring in the study area. Second, a map of slope classes, derived from the laser DTM was used in an expert-driven multilevel object-oriented approach. The resulting classes represent units corresponding to landforms and processes commonly recognized in mountain areas: Fluvial terrace, Alluvial Fan, Slope with mass movement, Talus slope, Rock cliff, Glacial landform, Shallow incised channel and Deep incised channel. The classification result was compared with a validation dataset of geomorphological units derived from an analogue geomorphological map. For the above mentioned classes the percentages of correctly classified grid cells are 69%, 79%, 50%, 64%, 32%, 61%, 23% and 70%, respectively. The lower values of 32% and 23% are mainly related to inaccurate mapping of rock cliffs and shallow incised channels in the analogue geomorphological map. The accuracy increased to 76% and 54% respectively if a buffer is applied to these specific units. It is concluded that high-resolution topographical data derived from laser DTMs are useful for the extraction of geomorphological units in mountain areas.  相似文献   

基于MapGIS的DTM模型应用——以矿产储量计算为例     

陈文杰 《城市地质》2008,3(4):37-40

本文应MapGIS平DTM模型,采用分别计算上表面或下表面与基准Z平面之间体积的方法,求取体积之差,进行矿山储量评估;与平行断面法储量计算结果对比,DTM模型计算精度更高。  相似文献   

不同地形坡度下各种土方量计算方法的比较研究     

刘振东 《测绘与空间地理信息》2014,(12)

土方量计算的精度不仅影响平整后的土地质量,还影响到土地平整工程的投资与效益问题.针对3种不同坡度范围的测区,分别用DTM法、方格网法、散点法以及区域平衡法等计算出土方量,并进行横向和纵向对比分析,得出不同方法的适宜坡度范围和精度.  相似文献