Angular resolution of terrestrial laser scanners
Angular resolution of terrestrial laser scanners
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DOI：
10.1111/j.1477-9730.2006.00367.x
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发表时间：
2006-06-01
影响因子：
2.4
通讯作者：
Jamtsho, S
中科院分区：
文献类型：
--
作者：
Lichti, DD;Jamtsho, S
激光扫描仪的空间分辨率的知识是必要的，以防止混叠和估计的细节，可以从扫描点云解决的水平。空间分辨率可以分解为距离和角度分量。后者是本文的重点，主要是由采样间隔和激光束宽度。然而，重点往往放在其中之一-典型的采样间隔-作为分辨率的指标。由于两者都会影响扫描点云的分辨率，因此仅考虑一个独立于另一个因素的因素可能会导致对系统功能的误解。除非在非常特殊的情况下，否则这将被证明是不适当的。提出了一种新的、更适合于激光扫描仪分辨率的测量方法--有效瞬时视场（EIFOV）。它是通过建模的偏移方差的等角度增量采样过程中，激光束宽度引起的位置的不确定性和观察到的角度量化与合奏平均调制传递函数（AMTFs）。几个商业上可用的地面激光扫描仪系统的建模和分析的角度分辨率的能力，使用EIFOV。
Knowledge of a laser scanner's spatial resolution is necessary in order to prevent aliasing and estimate the level of detail that can be resolved from a scanned point cloud. Spatial resolution can be decoupled into range and angular components. The latter is the focus of this paper and is governed primarily by sampling interval and laser beamwidth. However, emphasis is often placed on one of these-typically sampling interval-as an indicator of resolution. Since both affect the resolution of a scanned point cloud, consideration of only one factor independent of the other can lead to a misunderstanding of a system's capabilities. This will be demonstrated to be inappropriate except under very specific conditions. A new, more appropriate resolution measure for laser scanners, the effective instantaneous field of view (EIFOV), is proposed. It is derived by modelling the shift variance of the equal angular increment sampling process, laser beamwidth-induced positional uncertainty and observed angle quantisation with ensemble average modulation transfer functions (AMTFs). Several commercially available terrestrial laser scanner systems are modelled and analysed in terms of their angular resolution capabilities using the EIFOV.