Laser & Optoelectronics Progress, Vol. 57, Issue 12, 122804 (2020)
Influence of Distance Factor onthe Scanning Accuracy of Terrestrial Laser
Yang Meijie and Liu Jun*
- College of Urban Rail Transit, Shanghai Engineering Science University, Shanghai 201620, China
Laser intensity is affected by factors such as atmospheric environment, scanning distance, target characteristics, thus the laser intensity values of the similar targets have a large deviation. In order to eliminate the impact of the scanning distance on the intensity of terrestrial laser scanning, based on Lidar ranging equation, experiments with the same material, different distance, and reflection intensity of point cloud, are designed. The relationship between the laser scanning distance and the laser intensity of point cloud and the mathematical model are obtained. The models with better experimental data correction effects (including Taylor interpolation polynomial model, Sectional polynomial model, Section al Gaussian function, and polynomial mixed model) are used to modify the laser intensity of the point cloud. The results show that the Taylor interpolation polynomial model has the best correction performance, which effectively eliminates the deviation of point cloud intensity caused by the distance factor, and makes the laser intensity of the same kind of target tend to be consistent, and the laser intensity difference of heterogeneous targets is obvious.
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