Evaluation of Terrestrial and Mobile Scanner Technologies for Part-Built Information Modeling

The focus of this paper is on the relatively under explored area of partially completed (part-built) information modeling because this can assist during on-site construction processes. Additionally, incremental models will support the as-built model through demonstration of hidden construction in the finished building. This is achieved by evaluating state-of-the-art scanner technologies to determine relative performance and accuracy in creating part-built models. Five laser-based scenarios using state-of-the-art handheld and terrestrial scanners were deployed to examine their capability to accurately produce part-built modeling from constructed objects. It was found that terrestrial scanners provided more accurate part-built information models, although the operation process is technical and requires skilled operators. However, handheld instruments avoid individual setup points and take less time than a terrestrial station when scanning typical internal building floor areas. This study contributes to the body of knowledge by developing the concept of part-built information modeling using scanner technology, as well as by creating related evaluation criteria.