A RESOLUTION MEASURE FOR TERRESTRIAL LASER SCANNERS

摘要: Terrestrial laser scanners are increasingly being used for cultural heritage recording and engineering applications that demand high spatial resolution. Knowledge of an instrument’s resolution is necessary in order to prevent aliasing estimate the level detail can be resolved from a scanned point cloud. In context scanners, decoupled into range angular The latter focus this paper governed primarily by sampling interval beamwidth. Both factors give rise uncertainty position measurement, though terms reporting scanner resolution, it has become common practise emphasise one these factors—typically interval—as indicator Since both affect cloud, consideration only lead misunderstanding system’s capabilities. ramification actual may much lower than perceived when visually inspecting scan It will demonstrated factor independent other inappropriate except under very specific conditions. A new, more appropriate measure terrestrial therefore proposed paper. effective instantaneous field view (EIFOV) derived modelling inherent uncertainties equal increment beamwidth with ensemble average modulation transfer functions (AMTFs). practical outcome approach scientifically sound method quantifying users technology. Four commercially available systems modelled AMTFs analysed their as measured EIFOV. cloud indicated EIFOV coarse (by up 21 times) interval.