*2.1. TLS System*

Several studies have been carried out focusing on the use of terrestrial laser scanning (TLS) technology as an inspection approach including the application of TLS for health monitoring and the inspection of bridge structures [24,25]; condition monitoring and defect identification for historic structures and building facades [26,27]; checking concrete conditions [16,28]; and as-built modelling [25,29]. In a study of [24] TLS that was used in building damage inspection after an earthquake, the accuracy of the measurement was achieved at the millimetre level, a performance comparable with conventional methods like displacement transducers and inclinometers.

TLS has been widely adopted in the construction field for construction progress tracking [30,31], the reconstruction of buildings [32–35], and construction quality assurance [36–38]. However, limited studies have been performed using TLS to inspect the installation quality of high formwork.
