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1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM - STOCKHOLM SWEDEN
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Wednesday, August 16 - Applications and Cost-Effectiveness 4
HShle: Because we are in a session on cost-effectiveness, may I ask how
the cost per hour for the two systems differ? By the two systems I mean
a) the small comparator with computer assistance, and b) the analytical
plotter system, both of which fulfilled the task if I have understood
correctly.
(Here Miller said something amusing about the story in Germany
of a girl fetching milk - but I missed it.)
Müller: All they wanted to do was to find out, early, if there is a geo-
logical fault coming or not. And if you do not find out in time it costs
so much money that the money you spend for instruments doesn't make any
difference. You can use any instruments. It's a so small figure compared
to other costs. And so we had to decide this, or this. I myself would be
able to do it using an inexpensive stereocomparator that one could build
oneself. This would be the most inexpensive solution. In our case we
bought the best machine we could afford, and with an eye to other work
which we could do in the future. In this case it seemed best to trade our
Planimat for a Planicomp.
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Paper by M. Shortis and M. Cooper - City University, London
(Paper presented by M. Shortis)
"PHOTOGRAMMETRIC MEASUREMENT OF SMALL COMPONENTS FOR MOTOR VEHICLES"
*. . - LÀ * . » * . * * * e * * e * - e - * . * * * - e * * . * ® + * e e °
Chisholm: Could you give us some idea of the time scale from the begin-
ning of the project to the presentation of the final results?
Shortis: Approximately three days, one day for draughting and two days
for photography and production of the results.
Danko: We found an excellent material for coating dark objects for stereo-
photogrammetric purposes. This is a mixture of 240 grams of powdered chalk
per liter of alcohol. The mixture is sprayed onto the object. The alcohol
evaporates leaving a very thin coating of powdered chalk. The coating can
be wiped off or washed off after the photographs have been taken.
Abdel-Aziz: (Sorry. He spoke faster than the tape recorder recorded.)
Shortis: I agree that this is another possibility. But in this case we
wanted to produce precise digital data using a method that we knew very well.
If we had ventured out into other areas we might have struck specific prob-
lems that would have taken time to overcome. And this is one thing we
didn't want. Cost-effectiveness depends on time and expense. And I think
if we had ventured into another area it certainly would have increased the
time for the initial research.
Doyle: Your results seem to be perfectly satisfactory from a photogrammetric
point of view, but what has happened now between you and the automobile in-
dustry? Are they adopting this system or not.
Shortis: We have had no return whatsoever from the automobile company.
Konecny: Maybe you should not have been so cost effective. Perhaps they
would have listened.
