The ability to integrate laser scans with other BIM technologies, including Revit, speeds the development and improves the accuracy of existing condition models.
Existing-condition laser scans can be used to supplement existing drawings that may not fully describe a building’s current condition. Scans can be used within Revit to rapidly and accurately model existing conditions as well as supplement the Building Information Model in areas that are not to be modeled in Revit.
This library in western Massachusetts is being studied as part of a campus-wide master plan as the university looks to improve the services offered at its library and more efficiently organize its archives. The building originally consisted of only the “H-shaped” core building, constructed in the early 1900s. Several major additions have since been constructed, including significant alterations to the original building.
A Revit model of existing conditions was developed for the core building to aid the study of several alternative options and illustrate the changes that have occurred to the structure over the building’s lifetime. This model was developed using limited information available for the original construction and alteration projects. Exterior laser scans of the building façade and roof were used to confirm overall building dimensions and complex geometries at the roof level. The exterior scans also included the adjoining additions; while outside original scope of the study, the information captured about these structures provides context for the project and is used for area and length measurements, thereby reducing the need to visit the site.
The use of both interior and exterior laser scans allowed for accurate layout of an irregular column grid and assisted in understanding the available headroom for this adaptive fit-out project in a previously unoccupied basement space where travel paths and clearances are important. Scans of the building’s facade were used to help provide detailed elevations showing the surrounding structures and improving coordination with a new exterior patio space. Interactive photographs through our online viewer also allowed the owner, located overseas, to more easily visualize and understand the existing conditions, improving discussions with the design team.