“…Methods include a variety of platforms, such as manned and unmanned ground vehicles (UGVs) [4,5,6,7,8], unmanned aerial vehicles (UAVs) and hand-held sensors [9]. Different types of imaging sensors have also been used, including “standard” (visible light) cameras and stereo, near infra-red, long wave thermal infrared cameras and LiDAR [2,3,4,9,10,11,12,13,14]. Standard cameras are a common choice, due to their low cost, the richness and comparatively high resolution of the data they provide, as well as the familiarity to the machine vision community in terms of data acquisition and processing techniques [12].…”