PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, 1975
CONCLUSIONS
Photogrammetry has been shown to pro-
vide atechnique for dimensional quality con-
trol of marine structures which will give the
necessary accuracy. The attraction of the
technique undoubtedly lies in the fact that
the recording can be undertaken in a short
time with minimum disruption to production
work. The lack of flexibility in the time of
photography, the need for quick results and
the cost may, however, hinder its adoption.
To date, any evidence of this has been to
the contrary and it is pleasing that, as a result
of the feasibility studies outlined in this
paper, further developments have taken
place. Brown and Root-Wimpey Highlands
Fabricators Ltd. have now set up their own
photogrammetric unit to measure the units
and sub-assemblies of fixed-base offshore
platforms. The unit is equipped with a Zeiss
UMK camera and Steko 1818 stereocomparator.
The stereocomparator is fitted with Whitwell
digitisers and is interfaced to a Wang 600
minicomputer for the computational work
(Figure 7).
‘Fic. 7 The Zeiss Steko 1818 stereocomparator
fitted with Whitwell digitisers and interfaced
with a Wang 600 mini-computer at Highland
Fabricators Ltd.
Photogrammetry also is being used on a
second supertanker under construction by
the half-ship technique.
In spite ofthese developments there is still
further work to be done. So far no account has
been taken of the behaviour of such struc-
tures when subject to temperature changes.
Further, the post-launch changes in shape
have not been analyzed. It is hoped that
studies in these directions will be possible in
the future.
ACKNOWLEDGEMENTS
The collaboration of the British Ship Re-
search Association and Longdin and Brown-
ing (Surveys) Ltd in this work is gratefully
acknowledged. Special thanks are due to Mr.
J. B. Jack (BSRA) and to Mr. S. Longdin and
Dr. N. Eales (Longdin and Browning (Sur-
veys) Ltd) for their advice and assistance
throughout the project. The author is grateful
also to Mr. M. S. Evans of the Department of
Surveying, University of Newcastle upon
Tyne, who carried out most of the photo-
grammetric observations. Finally, thanks
must be expressed to Brown and Root-
Wimpey Highlands Fabricators Ltd and the
Scott-Lithgow Group for their generous
cooperation.
REFERENCES
Jack, J. B., 1974. Photogrammetry: The measure-
ment of a large vessel built in halves. BSRA
Research Report, NS 406, 26 pages.
Knodler, G. and Kupke, H., 1974. The use of in-
dustrial photogrammetry in the production of
ship's screws. Jena Review, 3:173-176.
Newton, I., 1974. Dimensional quality control of
large ship structures by photogrammetry.
Photogrammetric Record, 8 (44): 139-153.
Smith, W. G., 1971. Photogrammetry as an aid to
manufacture of ship piping. BSRA Research
Report, NS306. 30 pages.
Weinert, H., 1969. Umfang Funktion und Leis-
tungsvermôgen des Gerätesystems Industrie
Fotogrammetrie. Seewirtschaft, 1 (10): 792-
795.
