Fellow pipers,
Here is the nutshell information of the working of the
LASERSCAN system, as gathered from the vendors of the
software. The software (without naming any brand) is
capable of capturing the cloud image of points, with
the scanning of the laser camera, (shifted to
different locations in succession in the plot), in the
horizontal plane. It is obvious, the straight
elements, like beams and horizontal pipe runs look
curved, because of the angle based recording of the
image by the camera. The bench-marks (A4 size papers)
pasted on dominant locations in the plant, captured by
the same camera, with known coordianates/grids provide
the necessary dimensional database for the ânorthâings
and the âeastâings. The data taken in this way can be
transferred to the data processor, who knows about the
software.The software then interprets the information
in the picture with the grid coordinates and helps
rebuild the picture of the total plant with the AS
SEEN details. A good amount of human interface also is
required for achieving this result.
The reported claim is of plus minus 3 mm accuracy. It
sounds quite promising, time will say.
Regards.
C. V. Gangadharan.
> This is most probably the solution to the "as-built
> problem".
>
> Not having had direct experience with this yet, I'd
> guess that it is
> expensive. Of course, "expensive" is relative; how
> much does a
> two-person team with a tape measure/Disto cost for a
> one-week site stay
> cost?
>
> With 8 megapixel cameras becoming more affordable,
> this could have a big
> impact on smaller and mid-sized piping facilities
> that plan on upgrading.
>
> "CAD-Based Photogrammetry for Reverse Engineering of
> Industrial
> Installations"
>
>
http://www.itc.nl/personal/vosselman/papers/tangelder2003.cacaie.pdf
>
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