VERIFICATION OF FACTORS AFFECTING THE DEPTH ACCURACY OF POINT CLOUDS GENERATED BY TERRESTRIAL LASER SCANNERS AND SFM/MVS FROM VIDEOS

Abstract

 To measure the completed form of structures, we verified the depth accuracy of point clouds from terrestrial laser scanners (TLS) and SfM/MVS from videos using flat targets made of materials used in stations. For TLS, material, distance, angle, and environmental conditions affect accuracy, with TLS model, distance, and laser angle being key factors. For SfM/MVS, the shooting device, distance, and angle between the camera and subject affect accuracy, with materials having many good feature points, distance, and angle being key factors. These factors must be considered when selecting and performing point cloud acquisition methods.