Digital levels significantly simplify field work with regards to automated staff reading, measurement corrections and data storage. However, these instruments are subject to a number of influences ...whose effects can cause errors in measurements. This especially applies to the negative influence of refraction, which is a serious limiting factor of accuracy in precise levelling. It is still necessary to rectify the effects of refraction via professional analysis of levelling conditions and then choose the best methodology of work. It is particularly important to determine the optimal line-of-sight distance, which yields quality results while keeping greater work productivity. The impact of sight distance of a Leica DNA03 digital level on the final results of levelling network was investigated and described in this article. PUBLICATION ABSTRACT
Under the auspices of the Environmental Agency of the Republic of Slovenia a new state-of-the-art tide gauge station was set up in Koper. The paper presents the geodetic works that were performed in ...order to determine the position of the tide gauge station in theterrestrial reference system. All measurements were carried out during the testing period of the tide gauge, that is, from the end of 2005 until the begining of 2006.
The article describes the procedure for testing the statistical significance of point displacements in the geodetic network as the intermediate stage between the adjustment of respective epoch ...measurements and an in-depth deformation analysis. For the test statistics, a cumulative distribution function presenting the relation between the displacement and the displacement accuracy is determined by simulations. On the basis of the cumulative distribution function a critical value of the test statistic for a selected level of significance is determined. The null hypothesis presupposes that the point is not moved, it is composed. A comparison of the critical value to the test statistic value is made and the actual risk level for rejecting the null hypothesis is estimated. Further on, a practical example of implementing the test in a simulated network is given. The test statistics proved to be simple and applicable, owing to the fact that the points with significance displacements were singled out successfully.
U radu su opisani postupci deformacijske analize, koji na osnovi geodetskih mjerenja i uz pomoć statističkih metoda određuju prostorne pomake promatranog objekta. Za testiranje je uzeta simulirana ...geodetska mreža i na njoj su primijenjeni hannoverski, Ašaninov i Mihailovićev postupak. Prikazani su rezultati primijenjenih postupaka deformacijske analize i usporedbe uspješnosti određivanja stabilnih točaka.
Stabilnost nuklearne elektrane Krško Savšek-Safić, Simona; Skube, Klemen; Tacer, Matej ...
Geodetski list,
03/2008, Letnik:
62 (85), Številka:
1
Paper
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Nuklearna elektrana Krško (NEK) je za državu Sloveniju objekt od izuzetnog strateškog značaja, koji snabdijeva korisnike u Sloveniji i Hrvatskoj. Godišnja proizvodnja iznosi preko 5 milijardi kWh ...električne energije, što predstavlja približno 40% ukupne proizvodnje električne energije u Sloveniji i 17% u Hrvatskoj. U NEK se zahtjeva iznimno visok stupanj sigurnosti, stoga se izvodi cjelovit nadzor pojedinih objekata i postrojenja. Posebna pozornost je namijenjena sigurnosnim sustavima, među koje ubrajamo i mjerenja vertikalnih pomaka repera i horizontalnih pomaka brane na Savi. Periodična geodetska opažanja se izvode na objektima, koja po kategorizaciji spadaju u najviši sigurnosni razred koji obuhvaća nuklearni otok, branu na Savi i skladište radioaktivnih otpadaka. U radu želimo prikazati važnost geodetskih mjerenja za utvrđivanje stabilnosti i sigurnosti rada tog važnog objekta.
Članak prikazuje testni primjer uporabe GPS mjerenja za potrebe određivanja orijentacijskih točaka u fotogrametriji. 12 točaka na području Pivke određeno je pseudo-kinematičkom metodom opažanja i ...izračunate su njihove Gauss-Krügerove koordinate. Prikazana je fotogrametrijska obrada triju snimaka i dat je opći prikaz točnosti i ekonomičnosti metode.
