One of my larger projects back when I ran an engineering firm was to inspect all of the buildings owned and/or occupied by the State of Lousiana for asbestos and lead in water fountains. Part of the contract required us to produce floor plans of all the buildings we inspected because the State, at that time, did not have them. This technology really would have saved the State a lot of money and produced a much better final product too.
A new computer vision system creates 3-D maps of building interiors