| Summary: | FARO 3D Terrestrial Laser Scanner (TLS) system was used to evaluate the impact of distance on scanning the topographic, building or structure object due to the lack of knowledge on the impact of the distance toward the resolution of the image produced by the terrestrial laser scanner. There is a lot of high-rise building that need to be monitored from time to time to prevent unwanted catastrophe from accruing in a good plan city. This study aimed to investigate the accuracy of point cloud produced by the laser scanner by scanning the object at a different distance are performed, especially to find a suitable distance for optimum accuracy. The main fieldwork activity involved is the selection of the most appropriate position for setting up the TLS at three different distance which is 30m, 40m and 50m from the building. The chosen position must cover the same area view to make sure the image can be used to compare with each other in term of accuracy. Before scanning the selected side of the building, several targets were placed on the building as it is necessary to tie the building to control points on the ground that have been acquired with Real-Time Kinematic (RTK) Global Positioning System (GPS). The image processing is done by following the flow of the scanning using Scene software to link the target with 3D coordinate and generate a point cloud. The accuracy of the 3D image captured at three different distance generated by the Scene software is compared to evaluate the impact of distances on accuracy. It can be suggested that distance selected for the experiment is reliable for high accuracy measurement in monitoring of structural movement. © Published under licence by IOP Publishing Ltd.
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