Comparison of TLS and Photogrammetric 3D Data Acquisition Techniques: Considerations for Developing Countries

With the use of digital data, in conjunction with technologies such as BIM and digital twin, construction professionals have the ability to monitor the progress efficiently and perform detailed quality assessments. The rapid development of multiple data acquisition technologies, such as terrestrial laser scanning (TLS) and photogrammetry techniques, has allowed their broad integration in mostly middle to large-scale construction projects worldwide. However, this type of technology is often not accessible to small-scale contractors, especially in developing countries where high upfront costs and lack of skilled workers might be limiting factors. This study compares the economic, quality, feasibility, and value of TLS versus Photogrammetric data acquisition methods; i.e., the scope is not to discuss the benefits of using 3D digitization techniques but to consider if small-scale contractors can still take advantage of said benefits by using affordable technologies. Moreover, the impact of achieving complete automation by employing robotic platforms with TLS systems is also considered. A small case study is used to illustrate the quality and economic comparisons.