无人机DEM测点插值算法的矿区沉陷测绘技术

Mining Subsidence Mapping Technology Based on UAV DEM Survey Point Interpolation Algorithm

为实现对矿区沉陷深度的精准测量,完善测绘技术的具体实施方案,针对无人机DEM测点插值算法的矿区沉陷测绘技术展开研究;根据DEM测点获取结果,实施分维值测定处理,再以此为基础,确定插值拐点所处区域,实现对无人机DEM测点插值算法应用流程的完善;联合像控点布设原则,定义空中三角区域,并通过推导径向插值基函数的方式,建立矿区沉陷区域的地理模型;在空间坐标系转换条件的基础上,确定矢量数据叠加的处理结果,再结合像片倾角与旋偏角的实际取值,求解测量精度评价指标,完成无人机DEM测点插值算法的矿区沉陷测绘技术实施方法的设计;实验结果表明,上述测绘技术方法作用下,沉陷深度测量结果与矿区真实沉陷深度之间的差值不超过1 m,符合精准测量的应用需求,对于测绘实施方案的完善可以起到一定的促进性影响作用。

In order to realize the accurate measurement of mining subsidence depth and improve the specific implementation plan of surveying and mapping technologies,a mining subsidence surveying and mapping technology based on the unmanned aerial vehicle(UAV)digital elevation model(DEM)survey point interpolation algorithm is studied.According to the results of the DEM measurement points,the fractal dimension value is measured and processed,and on this basis,it determines the region where the interpolation inflection point is located,so as to improve the application process of the UAV DEM measurement point interpolation algorithm.The principle of the photo control point layout is combined to define the air triangle area,and the geographic model of mining subsidence area is established by deriving the radial interpolation basis function.On the basis of the transformation condition of the spatial coordinate system,the processing results of the vector data superposition are determined,and then combined with the actual value between the dip angle and the rotation angle of the photograph,the measurement accuracy of evaluation index is solved,and it completes the implementation method of the mining subsidence surveying and mapping technology for the UAV DEM measurement point interpolation algorithm.The experimental results show that under the above surveying and mapping technology,the difference between the measurement result and the actual settlement depth of the mining area is not more than 1 m,which meets the application requirements of precise measurement,and it can play a certain role in promoting the surveying and mapping implementation scheme.