Popli Design Group (PDG) provided an as-built of existing column locations, plumbness of exterior building faces, and other measurements of building features for the design of additions to Crouse Hospital. All features were measured using PDG’s Leica P20 ScanStation.  

Two primary locations were measured by laser scanning: an approximate 15,000 square foot shell space, with exposed concrete columns and the roof to that space, on which an addition will be constructed. Both areas scanned were registered into a single unified point cloud. The scan was also tied into the site vertical datum.

Within the interior space, laser scanning captured the complete layout of walls and columns.  Once the point cloud was registered, it was output to AutoCAD where existing column locations were drawn and centers located with the record column line grid. A plan showing x, y offsets of the existing column centers from original design was provided.

At the roof level, column lines established from the work below were used to provide a basis from which to measure walls that would be adjoining the future addition. Cross sections of the adjoining eastern and southern faces of the Memorial Building were provided, detailing any undulation or “lean” that may exist in the face of the brick structure. Also shown within the cross sections were measured offsets, from the face of building (at key elevations) to the established column lines on the floor below. This provided a physical tie from the roof level structures to the second floor column line grid. PDG survey staff physically laid out the column lines on the roof to aid the contractor during construction. Utilizing the laser scanner provided measurements necessary for completing an accurate design and to provide confidence that fabricated materials will fit site conditions.

The client only requested measurement information in AutoCAD format, which was provided.  However, the full point cloud can easily be placed into AutoCAD as a whole or broken into pieces, allowing the client to view the full data set and possibly provide necessary data without additional site visits or surveys.