三維激光掃描監(jiān)測地表沉降精度研究
[Abstract]:At present, the research on the accuracy of 3D laser scanning is mainly focused on the precision of measuring angle and ranging of instruments and the precision of the modeling model itself. In order to obtain the actual accuracy of the 3D laser scanning technology for monitoring the surface deformation, the design of the monitoring scheme of the surface deformation is guided. In this paper, four kinds of experimental sites of different terrain, such as flat concrete land, basically flat grassland, grasslands with certain slope and hillside, are selected, and the surface point cloud data are obtained by using 3D laser scanner. The effects of point cloud density, station distance, noise and terrain complexity on the settlement accuracy after surface modeling were studied by using DEM model based on Kriging rule grid. The main research results are as follows: (1) the data processing results show that the point cloud density has no obvious effect on the settlement accuracy, and the station distance is the dominant factor; By introducing elevation random error into the original point cloud data to simulate the effect of noise on settlement accuracy, it can be used to guide the selection of appropriate point cloud denoising method, and quantitatively analyze the influence of terrain complexity on settlement accuracy by means of curvature quantitative analysis. It can be used to determine whether the instrument can meet the monitoring accuracy requirements. (2) the relationship between the maximum station distance and the point cloud density of each experimental site is studied in combination with the monitoring accuracy of ground subsidence and the point cloud denoising requirement. It is found that the precision of settlement after modeling can reach the theoretical precision of instrument elevation in general, and the precision of settlement after optimal surface modeling can reach sub-millimeter level. (3) based on the research results of this paper, the influence of noise on settlement accuracy is controlled within 1mm. On the premise of judging that the instrument can meet the requirement of measuring precision, according to the relationship between the maximum station distance and the point cloud density, the appropriate station setting distance is selected, and the scanning point cloud density is reduced appropriately to save the outfield measurement time. It can be used to guide the design of the most economical surface deformation monitoring program.
【學位授予單位】:中國礦業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:P225.2;P642.26
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