Исследования точности методов геодезических измерений

Abstract

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