Tunnel three-dimensional laser data preprocessing method
A data preprocessing and three-dimensional laser technology, which is applied in image data processing, optical devices, measuring devices, etc., to achieve the effects of improving overall efficiency, easy management and search, and high-precision processing
Pending Publication Date: 2019-07-09
CCCC SECOND HARBOR ENG
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Problems solved by technology
At the same time, due to the massive point cloud data obtained by 3D laser scanning, the surface details of the physical model are more abundant, but the massive point cloud data has brought serious problems to the computer's storage, post-processing, rendering speed and transmission efficiency.
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Embodiment 1
[0051] Such as figure 1 As shown, the known point A(x 1 , Y 1 ,z 1 ) And B(x 2 , Y 2 ,z 2 ), site S(x, y, z). Such as figure 1 As shown in (a), since the instrument has been leveled, only one known point is needed to get the Z coordinate z of the station.
[0052] z=z 1 +L cosθ (1-1)
[0053] Among them: L is the distance from station S to a known point A, θ is the angle between AS and the vertical direction, and the above parameters are all known.
[0054] Such as figure 1 As shown in (b), we can get by the theorem:
[0055]
[0056] That is: α=sin -1 (L b sinγ / L ab ) (1-3)
[0057]
[0058] Where: L a , L b , L ab Is the horizontal distance between station S and known point A, station S and known point B, known point A and known point B, α, β, and γ are composed of station S, known point A, and known point B Angle, L a , L b , L ab , Γ are all known.
[0059] In another technical solution, the error formed by converting the point cloud into absolute coordinates through the con...
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The invention discloses a tunnel three-dimensional laser data preprocessing method which comprises the following steps: S1, obtaining three-dimensional point cloud data of a tunnel primary support andsecondary lining section through scanning; S2, converting the three-dimensional point cloud data into an xyz format file, and obtaining relative coordinates of a splicing point and a control point; S3, splicing the scanned station cloud data into a whole by using the relative coordinates of the splicing points, and converting the spliced point cloud data to tunnel absolute coordinates; S4, calculating a cutting boundary, and deleting overlapped data and long-distance invalid data among all station scans; and S5, performing thinning processing on the tunnel three-dimensional laser data processed in the step S4 to obtain simplified three-dimensional point cloud data of the tunnel primary support and secondary lining section. The tunnel three-dimensional laser scanning data is subjected to high-precision rapid preprocessing, the overall efficiency of three-dimensional laser data processing and analysis is improved, and the tunnel three-dimensional laser scanning data processing and analysis method can be widely applied to the field of tunnel three-dimensional laser technology application.
Description
Technical field [0001] The invention relates to the application field of tunnel three-dimensional laser technology. More specifically, the present invention relates to a method for preprocessing of tunnel 3D laser data. Background technique [0002] As the front-end technology in the field of 3D monitoring and inspection, the 3D laser scanner integrates a variety of high-tech new surveying and mapping instruments, and adopts non-contact high-speed laser measurement methods, which can realize rapid scanning and measurement of the measured object in complex scenes and spaces , Directly obtain the horizontal direction, zenith distance, oblique distance, etc. of the surface of the object touched by the laser point, automatically store and calculate, and obtain point cloud data, which can better meet the needs of three-dimensional monitoring and detection. [0003] However, the tunnel is a special long and narrow structure. Because the scanner itself has the requirements of accuracy an...
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IPC IPC(8): G06T3/40G06T7/70G01B11/00
CPCG06T3/4038G06T7/70G01B11/002G06T2207/10028
Inventor 陈培帅江鸿刘毅冯德定杨林闫鑫雨袁青黄威杨擎蒋道东高如超孔茜许超熊栋栋邱敏贺创波方俊唐湘隆王伟梁晓腾
Owner CCCC SECOND HARBOR ENG