Following on from a number of surveys undertaken for the Royal Academy of Art we were approached to produce a SCAN TO BIM of two existing galleries and their associated external spaces. The brief was to provide BIM to LOD 4 and involved the surveying of individual timbers and steels within ceiling and floor voids.
The survey works were undertaken using various HDS laser scanners tied into our existing project control with total stations. We were able to successfully complete the site work in the one evening time slot available to us; during the exhibition changer over period.
The individual laser scans were co-ordinated to our existing site control and combined into one overall point cloud. This enabled us to construct the required outline 2D CAD plans at various levels; floor, ceiling, roof void, external roof and courtyard.
This ensured that there where no errors within the cloud registration and confirmed that the final output would be in line with current RICS specifications. Once the accuracy of the 2D CAD plans had been checked they were then used as a base to build the BIM model.
Whilst one BIM team built the structural elements from the verified 2D CAD and scan data a second team concentrated on the LOD 4 detail using a combination of detailed site sketches, photographs and precise scans.
The resultant LOD4 BIM provided the client with accurate detailed information on individual mouldings on walls and ceilings, detailed air circulation grates, roof trusses, window mullions, light switches, access hatches and lead flashing.
The model has been used to plan exhibitions and associated lighting, highlight areas for repair and restoration, and provide proposals for future expansion and re-design of the spaces.