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1 Reports on Geodesy

1 2011

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Evaluation of accuracy of control points position using a laser scanning system Leica HDS 3000

Štroner M., Smítka V., Třasák P.

Reports on Geodesy

2011

z. 1/90

447--460

Control points are inseparable components of the laser scanning measurement process. They are mainly applied to connect point clouds from various standpoints. These points also ensure control in transformations of individual scanning positions and thus significantly affect the accuracy of the whole processing. This article deals with the evaluation of the accuracy of control points’ position determination using the Leica HDS 3000 laser scanning system. For this purpose, a special measurement experiment was designed and performed in which a geodetic network consisting of control points of various design and produced by various manufacturers was measured. The measuring experiment checked the “internal accuracy” (by repeated measurements) of the determination of control points’ coordinates using the laser scanning method; furthermore, the accuracy of coordinates determined by the laser scanning method was compared with the coordinates measured by the total station. Coordinates determined by means of laser scanning from different standpoints were mutually compared. Last, but not least, the instrument accuracy declared by the manufacturer was monitored and compared with the results of measurements conducted in laboratory conditions. Five types of control points were used for this experiment. Then, the position determination accuracy was evaluated in relation to individual types of control points used.