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UDC: 006.44:[528.482:519.23
DOI: 10.14438/gn.2013.22
submitted: 2013-12-02, accepted: 2013-12-13, published: 2013-12-23

On the precision of measuring horizontal directions in engineering projects

Žarko Nestorović1*

1Powerplant Đerdap, Serbia

Abstract. Calibration of geodetic instruments is performing in accredited laboratories designed for that purposes. The results of these examinations however do not represent the conditions under which the production measurements are performed. From this fact follows that the accuracy and precision obtained in laboratories conditions are not burdened with all influences which could occur in field. The influences which could occur in field conditions may lead to the unpredictable consequences on accuracy and precision of measuring results of horiyontal directions. ISO standards prescribe the way of precision of horiyontal directions testing in field conditions, but the conditions could vary from the between construction sites. Based on this fact the author is advising the testing of horizontal directions for each particular construction site. The precision of horizontal directions testing shal be provided for geodetic equipment which will be used during particular project realization with respect of ISO 17123-3 recomendations of measuring three sets of angles in four series, but number of points and selection of directions should be chosen in way that represents the caracteristc conditions of construction site. Bearing in mond that measurements are not performing only for their precision determination but primarly because their value it is also necessary to test and discuss the obtained values of measuring directions. The conclusions about achieved precision and values of measuring horizontal directions are based on statistical hypothesis testing

Keywords. ISO 17123, statistical analysis, statistical hypothesis testing, measuring uncertianty

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