SCANMASTER 1000 SOFTWARE

This procedure was repeated for all four control points until the crew reached the top deck. After obtaining the precise elevation of the overhead deck, the survey crew chief would add 6 mm (the thickness of the deck), move to the next level and repeat the procedure. The standard rod was used to obtain the instrument HI (height of instrument) and the inverted rod was used on the overhead deck. Starting at a previously established benchmark, the crew alternated between standard and inverted level rod shots.

The crew then used its Topcon DL-502 digital level to establish precise vertical control for each control point on all decks.

A closed traverse loop was run around these four points and was later adjusted and balanced out using standard survey procedures. Once finalized, the crew chief set up either the total station or the scanner on the top deck and a hole was drilled in the deck, allowing the laser plummet beam to pass through to the deck below. With the help of QCI Marine employees, the four points were positioned to avoid hitting critical components on the way down. The survey crew chief proposed using the laser plummet on his Topcon GPT-3100W total station to establish four control points that were to start on the top deck and extend downward through all of the decks to the pavement beneath the structure. A best fit between the cloud and model was obtained and the resulting deviations were depicted in a color map.Дale Stockstill & Associates used a GLS-1000 high-definition laser scanner from Topcon Positioning Systems to develop a 3D survey of the accommodation vessel.Д®xtremely high-tolerance specifications for some of the required structures ranged from 3 to 15 mm.

SCANMASTER 1000 SOFTWARE

This model was inserted into DS&A's PolyWorks software along with the registered point cloud. QCI provided DS&A with a 3D model of the helipad. After the scans were registered, DS&A's technicians provided 2D control drawings to QCI in addition to introducing the client to color mapping, which provides a visualization of design deviations. Using ScanMaster software, 'bes-fit planes' along each side of a point cloud were intersected to establish the corners of the accommodation module.ДЄfter carefully choosing and tying in his scan positions, the crew chief of DS&A's scanning crew performed the necessary scans of the helipad using DS&A's GLS-1000 high-definition laser scanner from Topcon Positioning Systems. Also, crews were constructing the vessel while the as-built surveying occurred, and the sheer size of the structure made surveying difficult. Determining whether or not such a vessel was constructed according to specified 3D design tolerances for QCI Marine Offshore, Pascagoula, Miss., was challenging, due to the flexural forces of the steel, malleability of the steel under welding and the difficulty of access.

Scanmaster 1000