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ACCURACY MEASUREMENT DETERMINATION ON DIFFERENT DISTANCES USING GEODETIC NETWORK MEASUREMENT AND ADJUSTMENT
Abstract
The paper focuses on the experimental determination of the accuracy of automatic angular targeting of total stations. The measurements were carried out with Trimble S6 HP and Trimble S8 HP robotic total stations owned by the Department of Special Geodesy at the Faculty of Civil Engineering, CTU in Prague. Accuracy of targeting was determined with use of both laboratory and outdoor experimental geodetic networks. The laboratory micronetworks were two. One was made up of 10 points with a length of sight from 1.8 m to 3.1 m, and the other consisted of 6 points with sight lengths from 2.3 m to 5.3 m. The outdoor network was made up of 6 points with a length of 30 m. The geodetic measurements were carried out from each point to all the other neighboring points of the network, as a target was used the Leica mini prism GMP101. Accuracy of automatic targeting was then determined by the least squares adjustment method with use of the GNU Gama software. The resulting aposteriori standard deviations of horizontal directions, zenith angles and slope distances characterize the accuracy of automatic targeting and measurement, at very short lengths of sights were achieved higher (worse) values of standard deviations than the manufacturer stated. At larger distances in the outdoor network, the standard deviations responded the manufacturer's parameters. The results verify the functionality and accuracy of the automatic targeting, while pointing to the need to consider worse accuracy for short lengths. It is also an interesting and reliable way of verifying (or directly determining) the achievable accuracy in conditions corresponding to the situation of use and therefore the reliability of the derived standard deviations is very high.
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References8
Braun J., Precision of angular measurement of total stations Trimble M3, ADVANCES AND TRENDS IN GEODESY, CARTOGRAPHY AND GEOINFORMATICS, UK, 2018, pp 15-20, ISBN 978-0-429-50564-5.
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Braun J., Křemen T., Pruška J., Micronetwork for Shift Determinations of the New Type Point Stabilization, 2018 Baltic Geodetic Congress (BGC Geomatics), Poland, 2018, pp 265-269, ISBN 978-1-5386-4898-8.
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Fládrová H., Testing of Trimble S6 and S8 total stations automatic targeting precision, Bachelor Thesis, Faculty of Civil Engineering CTU in Prague, 2016
Trimble S6 – Datasheet, [Online] 2013, http://trl.trimble.com/docushare/dsweb/Get/Document-218010/022543-098L-CZE_TrimbleS6_DS_0613_LR.pdf.
Trimble S8 – Datasheet, [Online] 2015, http://trl.trimble.com/docushare/dsweb/Get/Document-390412/022543-410H_TrimbleS8_DS_0115_LR_sec.pdf.
GNU Gama, [Online] 2013, https://www.gnu.org/software/gama/.
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