Исследования точности методов геодезических измерений

Abstract

3. The total station is more applicable for measurements in dense urban territories. As the final bachelor work was completed, the accuracy of the topographic data measurements were assessed and evaluated by using different measurement techniques. Object of the research: Lithuanian geodetic stations and the territories around them, situated in the Kaunas. Aim of the research: to assess and evaluate the accuracy of the topographical data measurements obtained by different measurement techniques. Objectives of the research: 1. To analyze the aspects of designing contemporary geodesic GPS network; 2. To analyze the most often used topographic data assessment methods; 3. To review measurement devices, used for different measurement techniques; 4. To compare the accuracy of the main topographic data measurements. Research methods: mathematical-statistical data analysis. Research results: 1. The topographic data measured by the GPS receiver and the total station and the assessed accuracy of the measurements are compared: 1.1. The root mean square error of a point, coordinated by the GPS receiver, positioning in a non-urban territory: ± 4.8 mm, height: ± 2.6 mm. 1.2. The root mean square error of a point, coordinated by the total station, positioning in a non-urban territory: ± 4.2 mm, height: ± 0.4 mm. 1.3. The root mean square error of a point, coordinated by the GPS receiver, positioning in an urban territory: ± 4.2 mm, height: ± 2.3 mm. 1.4. The root mean square error of a point, coordinated by the total station, positioning in an urban territory: ± 3.7 mm, height: ± 0.2 mm 2. As the accuracy of measurements in a non-urban and in urban territories was assessed, it was ascertained that all the measurements complied with the accuracy requirements. The data being processed by the mathematical-statistical method, it was determined that the measurements obtained by the GPS receiver by the real time kinematic method are exact enough for the performance of the geodetic-topographic work, though significant measurement errors are possible in urban territories in case of signal interferences.