Abstract
Aim of this study was to appoint values of collimation and horizontal axis errors of the laser scanner ZF 5006h owned by Department of Geodesy and Cartography, Warsaw University of Technology, and then to determine the effect of those errors on the results of measurements. An experiment has been performed, involving measurement of the test field , founded in the Main Hall of the Main Building of the Warsaw University of Technology, during which values of instrumental errors of interest were determined. Then, an universal computer program that automates the proposed algorithm and capable of applying corrections to measured target coordinates or even entire point clouds from individual stations, has been developed.
Highlights
1.1 MotivationLaser scanners are often being described as "very fast, reflectorless tacheometers"
Test field (Figure 3.) used in this experiment was founded in the Main Hall of the Main Building of the Warsaw University of Technology
It is possible to obtain precise values of angles the scanner was rotated in its tribrach, by comparing observations to corresponding targets acquired with the same face of the instrument, as their substraction is free of collimation and horizontal axis errors influence
Summary
Laser scanners are often being described as "very fast, reflectorless tacheometers". This is due to a fact, that the same methods of measuring directions and distances are used in both of them. Most of instrument errors related to total stations apply to laser scanners All such faults are investigated and somehow (either mechanically or electronically) eliminated during professional calibration, it used to be a common practice by surveyors to occasionally inspect them. The users should be able to audit their instruments by themselves because the values of instrument errors may change due to mechanical damages, improper storage, variability of measurement conditions and the passage of time. Knowledge of those values is critical to determine survey's accuracy or to apply adequate corrections
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