Scholarly record
TESTING OF ACCURACY TOTAL STATIONS
Abstract
The calibration of the geodetic apparatus is nowadays viewed as common. It is recommended to test it as soon as the new apparatus has been purchased, as it is necessary to find out whether the apparatus meets the parameters declared by the manufacturer. It is also necessary to test it at regular intervals (during the period of two or three years), after it has been repaired, or if any deviation has been found during the process of surveying. The testing of geodetics apparatus are preceded in such a way they correspond with the CSN ISO 17123 standards. Besides these standard procedures the tests were extended by non-prismatic measuring properties testing. This paper deals with the calibration of four new total stations, that is TCRP 1201, TCRP 1202 by Leica, GPT 7001, and GPT 8203 by Topcon, which were recently bought by the institute of Geodesy and Mine Surveying, VSB-TU Ostrava, Czech Republic. The research of total stations’ accuracy without the use of reflecting prism on the surface of various colours is specifically presented in this paper. The results of the experiment showed the differences between the accuracy of distance measurements on reflecting prisms and on coloured targets with different reflectance. The target reflectance did not significantly influence the accuracy, but the fact, that the distance on dark targets were not measured at all by some apparatus. The increase of the number of individual distance measurement did not lead to the increase of measured distance accuracy, on the contrary, the dispersion of measured values increased. None of the measuring exceeded the manufacturers’ declaration of accuracy on a white mat Kodak grey card surface. By writing this paper we do not mean to undermine the quality of the tested apparatus. We just want to make you aware of the fact, that it is necessary to take in consideration the suitability of non-prismatic distance measurement technology use, or to test the measurement accuracy for every particular case.
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References12
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