COMPARISON OF THREE ACCURATE 3D MEASUREMENT METHODS FOR EVALUATING AS-BUILT FLOOR FLATNESS

摘要

One usual complaint about building quality is flatness of a floor. If deviations from planar could be discovered before construction iscompleted, savings counted in time, money or reputation, can be noticeable. However, finding the possible deviations exceeding thetolerances may be time consuming using the traditional methods.We have tested three accurate 3D measurement methods; photogrammetry, laser scanning and tacheometer, for evaluating as-builtfloor flatness. An experimental work was done and measuring accuracy, time and expenses were compared in order to illustrate, howrealistic these methods are for construction companies.All the methods proved to be suitable for the purpose and gave rather similar results for flatness of the test floor. Laser scanner gavethe most detailed information of floor flatness. Photogrammetric and tacheometric measurements were the most accurate.