Fig. 1. Photographs of measured objects. (a) 24 standard color card; (b) map

Fig. 2. Relationship between intensity of different channels and different parameters. (a) r channel; (b) g channel; (c) b channel

Fig. 3. Intensity correction of multi-spectral LiDAR point cloud data. (a) Original point cloud; (b) intensity corrected point cloud

Fig. 4. Reconstruction and optimization of color card and map point cloud color. (a) Point cloud for colour reconstruction; (b) point cloud with color optimization

Fig. 5. Chromatic aberration results before and after 2000 point optimization of color card blocks. (a) Ratio of color difference reduction; (b) acceptable proportion of color difference