1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM — STOCKHOLM SWEDEN
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Atkinson: the points of the experiment in fact was to look at the necessity
for targetting and we co-ordinated points which were targetted in two differ-
ent ways, and points which were not targetted at all. There was a fall off
in accuracy, but still an acceptable accuracy with untargetted points. Final-
ly I think the really critical difference between the two tunnels, as I
estimate from reading your paper is really the diameter. The diameter of the
Mersey tunnel is more than twice the diameter of the Hong Kong Mass Transit
tunnel, and I think that in the larger diameter tunnel there is a better
chance for photogrammetry being a more cost-effective solution.
Eales: I think that I agree with most of the points that Mr. Atkinson has
raised. As I mentioned in the presentation we were able to reach all points
of the Hong Kong tunnel with a 3 m rod. You are talking about a road tunnel,
perhaps a six or seven meter diameter tunnel. The rods that would be re-
quired would become unwieldy and the system would defeat itself. I think
this re-emphasizes the fact that each individual application should be con-
sidered on its own merits, and we should not glibly assume that, necessarily
the EDM solution or the photogrammetric solution is the best method for
every tunnel.
Voss: Why the utilization of the UMK in the unusual vertical position? À
vertical mount should have been used.
Eales: We did in fact investigate this possibility. But we found that with
this mount we could not use the ? - ? for the UMK system. Secondly we
found that we had no particuoar mechanical problems using the camera in the
way we did. It was a matter of cost-effectiveness.
$5$09 u$ $99 $'5 5 $ 5$ $ 9^9 9^5 S^S $-S^6 S8 $ 85
Paper by B.-G. Miller - RWIH - Aachen
"INDUSTRIEPHOTOGRAMMETRIE IM STEINKOHLENBERGBAU AN DER RUHR"
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Konecny: Thank you Prof Müller. I think some of your comments may be a
direct answer to some of the discussion in the panel that was held regarding
analytical plotters yesterday.
Karara: What is a semi-metric camera?
Miller: A metric camera is adjusted by the firm. A non-metric camera re-
quires self calibration. A semi-metrric camera ? - ?.
Karara: (The question was not clear on the tape.)
Miller: That was one reason for using the Planicomp, because we auto-
matically go to the reseau points. It doesn't really matter if there are
reseau points.
Konecny: Prof. Wapifiski has just told me that he is afraid that the system
which you have described may really cost, for practical purposes, quite a
lot of money. From the academic side I can say just as you, anyone that is
using analytical plotter principles is off to a better product, and really
you can do a lot more with it.
Miller: It is a question of balance. If you leave the big machines in the
mine waiting it costs more money than the investment in a Planicomp.
Konecny: Fine. You are saying that in your situation where there is a
research environment, you can really make use of it.
