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《Geotechnical Investigation & Surveying》 2013-12
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Automatically extracted the slice point cloud of the cable tunnel and analysis of geometric parameters

Meng Yang;Feng Fajie;Hubei Electric Power Survey & Design Institute;  
This paper proposed the algorithm of automatically extracting slice point cloud data according to the relationship between the datum and the normal vector of tunnel wall. The algorithm uses the point cloud data of the tunnel wall obtained by the three-dimensional laser for solving normal vector,and fits the tunnel ground according to the Orthogonal total least squares. The relationship that the reference datum is perpendicular to the horizon and parallels to the normal vector of point cloud can be used to seek for the best datum. Through the use of the datum that has been found,the cross-section slice of the point cloud data can be extracted. This method makes it possible to automatically get the datum of cross-section slice of the point cloud data without target. The slice point cloud of the cross-section can quickly be extracted according to the acquired datum,and used to get the geometric parameters.
【CateGory Index】: U452.11
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