Abstract
Abstract. Terrestrial laser scanning technology has been applied more and more widely in the field of Surveying and mapping. Although requirements of the accuracy for different laser scanner survey may differ considerably, spatial resolution is an important aspect, which can be divided into range and angular components. The latter is a focus of this paper and is governed primarily by scanning interval, laser beam width and angle quantisation. An ultimate goal of this research is to derive the relationship and simplified formula between scanning interval and the angular quantisation when the EIFOV(Effective Instantaneous Field of View) is equal to the scanning interval; the relationship and simplified formula of scanning interval and the angular quantisation when the EIFOV is equal to the laser beam width, and the relationship and simplified formula of the theoretical minimum EIFOV and the angular quantisation. Firstly, this paper introduces the EIFOV model and the AMTF(Average Modulation Transfer Function) model. Secondly, the dimensionless AMTF and EIFOV generic model are proposed. Thirdly, the above relathionships are deduced，which are ellipse or hyperbola, and the three simplified formulas are proposed. The simplified formulas have direct significance on the angular resolution's calculation and the scanning interval setting.
Highlights
The emergence of the terrestrial laser scanning technology has broken the traditional mode of surveying data acquisition and processing, and has promoted the development of the objective surface characteristics’recovery techinque which is based on the measurement model of point cloud(Reshetyuk, 2009; Zhang Yi, 2008)
The point cloud angular resolution is related with the laser beamwidth that is affected by several factors such as the scaning distance, the divergence characterization of laser beam, the diameter of the transmitting aperture and the inclination angles of the objective surface, etc(Zhang Yi, 2008;Lai Zhikai, 2004)
Spatial resolution governs the level of identifiable detail within a scanned point cloud and is important for recording of objective features with fine details(Lichti,2006)
Summary
The emergence of the terrestrial laser scanning technology has broken the traditional mode of surveying data acquisition and processing, and has promoted the development of the objective surface characteristics’recovery techinque which is based on the measurement model of point cloud(Reshetyuk, 2009; Zhang Yi, 2008). In terms of terrestrial laser scanning technology, the spatial resolution designates the range and angular resolution of point cloud. The latter is the main factor to determine the objective details’ recognition capability of point cloud (Lichti, 2006; Zhu Ling, 2008), which is governed primarily by scanning interval, laser beam width and angle quantisation.
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