Abstract: In order to conduct ranging precision calibration of ground 3D laser scanner,taking Focus3D laser scanner as the study example,the ranging precision calibration experiment of radial distance and spatial distance is done.The spherical targets with geometric centers are scanned by using Focus3D laser scanner to obtain the experimental point cloud data,and the fitting precision of the point cloud data is evaluated by using Geomagic Studio software.The experimental results show that the measurement precision of spatial distance of Focus3D laser scanner is 0.61 mm (≤2 mm),among the measurement distance range of 5~40 m,the radial distance measurement precision is -2~2 mm,if the measurement distance is longer than 50 m,the radial distance measurement precision is discrete.

Key words: Ground 3D laser scanner, Ranging precision, Radial distance, Spatial distance, Geomagic Studio, Spherical target