Mixed LS-TLS surface fitting in point cloud filtering

doi:10.13474/j.cnki.11-2246.2020.0247

Abstract

Abstract: Aiming at the problems of the discontinuity of the fitted surface, the unreasonable parameter solution and the unclear threshold of the height difference in the process of point cloud filtering, a method for constraint surface fitting based on mixed LS-TLS (least squares-total least squares) is proposed. The multi-scale grid is constructed based on the weighted slope value of the center grid, the criteria for selecting the ground seed points based on the grid neighborhood is discussed, and the methods and steps for solving the mixed LS-TLS surface equation and adjusting the height difference threshold according to the filtering result are analyzed. Experiments show that the precision of point cloud filtering in complex regions is improved and benefit for the generation of digital elevation model.

Key words: point cloud data, multi-scale grid, mixed LS-TLS, surface fitting, filter

CLC Number:

JI Wenlai, RUI Ming, LI Mingfeng. Mixed LS-TLS surface fitting in point cloud filtering[J]. Bulletin of Surveying and Mapping, 2020, 0(8): 50-54,91.

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