期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B5
页码：1053-1060
出版社：Copernicus Publications
摘要：Experience in applications of TLS for deformation monitoring of concrete structures have shown the need of further exhaustive study about the quality of retro-reflecting target measurement. Indeed, this factor is highly influencing the georeferencing that is of primary importance to compare scans acquired at different epochs. Here some tests carried out by means of a RIEGL LMS-Z420i laser scanner are reported. In addition, several algorithms for automatic retro-reflecting target measurement have been applied, and new ones proposed. Results obtained from lab experiments have revealed a good repeatability on target measurement, while the accuracy is highly affected by a bias on the measured range. This mainly depends on the distance of the target from TLS, and on the angle of incidence of laser beam. In order to compensate for this error, two approaches have been successfully tested: the estimation of a corrective function, and the use of an algorithm for automatic retro-reflecting target measurement which locally estimates the bias on the range
