PRACTICAL TERRESTRIAL LASER SCANNING FIELD PROCEDURE AND POINT CLOUD PROCESSING FOR BIM APPLICATIONS – TNB CONTROL AND RELAY ROOM 132/22KV

Abstract. The transmission main-intake isoneof the most important units to supply the electricity in some place. Each transmission main-intake has its own utilities and assets according to each function and type. During this time, each transmission main-intake structure and the assets inside only canbe monitored by 2-dimensional (2D) model other than on-site visits. This study is conducted to produce a 3-dimensional (3D) model of the building's internal structure and assets that will facilitate and further improves the monitoring process, maintenance and documentation of assets for certain parties for further uses in form of 3D Building Information Modelling (BIM). This study was conducted in Tenaga Nasional Berhad (TNB) control and relay room at PE61 132/22KV Transmission main-intake building of Universiti Teknologi Malaysia (UTM) using Terrestrial Laser Scanner (TLS) Topcon GLS-2000 model. At the data processing stage, several series of software was used to complete the 3D model. Scanning process will generate an indoor point cloud of the building. The result from the data processing stage is more focused on the 3D internal model of the building that has been digitized from the point cloud data. The 3D model will be able to show the internal structure of buildings and the assets more clearly. In order to complete the 3D BIM, information regarding the assets was added. In this study, the efficiency of TLS Topcon GLS-2000 for 3D BIM was determined in term of its accuracy by comparing with the distometer. The accuracy for scanned data from TLS were compared with the distometer by using root mean square error (RMSE) formula, and the accuracy is only ±0.004 m.