点云密度对地面三维激光扫描精度及沉陷参数的影响

根据平面分辨率的理论公式，推导地面三维激光扫描仪不同距离处的立面及平面相邻点间隔（即点云分辨率）计算公式，并得到了平面某一距离处平面单位面积的点云数的计算公式；通过试验分析点云分辨率对点位精度及测距精度的影响；通过对某矿沉陷观测的点云数据按照不同的分辨率进行重采样并进行求参，得到不同分辨率下参数的变化情况，经对比分析，得到最佳的点云分辨率设置标准为300 mm/100 m。

The Influence of Point Cloud Density to Accuracy of Terrestrial 3D Laser Scanning and Mining Subsidence Parameters

According to the theoretical formula for plane resolution，the formula for adjacent point gap（namely point cloud resolution)，which located in vertical plane and horizontal plane away different distance from the center of terrestrial 3D laser scanning，is deduced.And the formula for calculating numbers of points in unit area located in different distance from scanner is also obtained.The influence of point cloud resolution to positional accuracy and ranging precision is analyzed through experiments; Probability-integral parameters are acquired by using point cloud data of mining subsidence observation in some coal area resampling with different resolution，then analyzing the change of parameters under different resolution，The setting criterion of optimum point cloud resolution is determined to be 300 mm/100 m after contrast and anlysis.