Laserscanner changed surveying in a way that not only a representative singlespots are measured, but a moderately accurate and detailed scatter plot. This diploma thesis presents the terrestrial laserscanner LMS-Z360iof the company Riegl. The LMS-Z360icorresponds to the Orthos laser-tunnelscanner of the company Geodata, but with software packages called Orthos and Orthoscan. The software Orthosscan allows the control of the Orthos laser-tunnelscanner in the field and the software Orthos provides the interpretation and the diverse presentation of different results. The first part of this paper deals with theorie, especially the issue of laserscanning in general. First the author compares the laserscanning with the tachymetry, and then explains the reflectorless range finding and its features, measurement uncertainty, the quality of the collected data and the run of a project in general. Afterwards the lasercanner LMS-Z360iis presented in detail and the author explains the setup, the system components and the run of a survey. The calibration of the system and the accuracy are examined. The second part of the paper deals with the utilization of the laserscanner LMS-Z360iin the field. This is demonstrated on the one hand in a open pit application a scanning a rockwall on the level Rothballer at the Erzberg and on the other hand with an underground application documenting a gallery system at the company Hirtenberger AG. Both examples are explained in detail with regard to the run of the project and the results.