The precision of the remaining control points is below these levels.

The RTK measurements, which were measured five times, determined with a maximum standard deviation of 8 mm (point I) and 1.5 cm (point A) for horizontal and vertical coordinates respectively. When using RTK method on the same reference network points, 9 mm in horizontal and 1.5 cm accuracy in vertical coordinates has been achieved. According to the result obtained, the reference network points measured with TS were determined with 1 mm precision for both horizontal and vertical coordinates. The data were processed in Cyclone, Geo Professional School and Leica geo office software. Then comparison made to evaluate the quality of the coordinates of the target points determined with both measurements. These six target points were also measured five times with TS. In addition, in order to compare the accuracy, precision and time expense of total station and TLS, the North Eastern façade of the L building at KTH campus in Stockholm, Sweden has been scaned five times with HDS 2500 scaner on six target points. The reference network points were also measured five times with the GPS RTK method so as to compare accuracy, precision and time expenditure with that of TS. To investigate this task, a reference network consisted of 14 control points has been measured five times with Leica 1201 TS and served as a reference value for comparison with RTK and TLS measurements. Comparing precision, accuracy and the required time of these three measurements will improve the knowledge about how much precision and accuracy can be achieved and at what time expense.

The objective of this thesis is to evaluate and compare precision, accuracy and time expenditure of total station (TS), Global Positioning System (GPS) and terrestrial laser scaner (TLS). For this reason, different methods of measurement should be used. Today, advanced GPS receivers are improving the accuracy of positioning information, but in critical locations such as urban areas, the satellite availability is limited above all due to the signal blocking problem, which degrade the required accuracy.

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