kantsi_photogrammetry_estonia_open_lidar_24_computing_difference_vector_18 Published August 13, 2018 at 1040 × 807 in Using Open LiDAR to Remove Low Noise from Photogrammetric UAV Point Clouds ← Previous Next → Use pop-up menu to select “reclassify points as keypoint” and draw a polygon around the flat part of the triangulated surface.