En jämförelse mellan tre geodetiska tekniker

• Main Author: Bruce, Peter
• Format: Other/Unknown Material
• Language: Swedish
• Published: Lunds universitet/Utbildningar i Helsingborg 2013
• Subjects: terrester laserskanning; punktmoln; felkällor; totalstation; rtk; Technology and Engineering; Refuge Islands
• Online Access: http://lup.lub.lu.se/student-papers/record/3958760

Terrestrial Laser Scanning (TLS) is a technique to rapidly collect detailed and accurate data of an object. The technology can briefly be described as a laser beam emitted by an instrument which sweeps across a target object collecting millions of closely placed coordinates (x,y,z) in a matter of minutes. Terrestrial Laser Scanning technology has existed for a long time however only in recent years has the technology become more widely used in the construction industry. This is due to the equipment becoming cheaper and easier to handle using different software. For example the technology is now used for as-built documentation, volume calculations and mass movement monitoring. Another type of measurement method is with the traditional total station. In contrast to the terrestrial laser scanner the total station only measures one coordinate at a time but with higher accuracy. The current problem with total station measurements is the high safety risk it poses at intersections due to having to enter traffic to take measurements. The aim of this thesis is to investigate the possibility of replacing traditional total station measuring with Terrestrial Laser Scanning at intersections. Comparisons are made between total station and scanning measurements at the Sölvegatan/Tornavägen intersection in Lund. Details such as the corners of the crossings, refuge islands and ramps have been measured with total station in order to do distance comparisons with the laser scanning data. Comparisons have also been made between GPS and total station measurements. The measurements have been performed with a total station (Leica TPS 1200+) and a Terrestrial Laser Scanner (Leica ScanStation P20). Cyclone 8.0 has been used for working with the scan data. The results presented in Chapter 4 show that terrestrial laser scanner may replace measurements with a total station. Terrestrial laser scanner is also more accurate than the RTK measurements. It is important to note that the results are still inconclusive as the measurement methods ...