(CONST TCUTCYNT 
4. CONCLUSION 
  
Although modern equipment and technique can be used to 
solve many measurement problems that arise, this is not 
a sufficient justification for their use. 
Many examples exist where application of computers has 
caused more problems and expense than traditional methods. 
Similar examples can be produced for EDM and photogram- 
metry. It is not enough to show that a technique can be 
used for a certain task, but that it is better or more 
economic than the alternatives. 
4.l. Equipment 
The simplest most versatile photogrammetric unit is pro- 
bably a stereocomparator fitted with digitisers and linked 
to a personal computer. If continuous plotted lines are 
required, an xy plotter can be added to the system. Such 
equipment can cope with the wide variety of photogarphy 
that is encountered in Industrial Photogrammetry. 
4.1.1. Non-Metric Photography 
  
In recent years very high accuracy measurements have been 
obtained using non-metric photography. This was not suit- 
able for the oil platform project, since the savings on 
cameras would be spent on a bigger computer and software. 
Besides many more photographic measurements are required, 
which increases turnaround time and adds to running costs. 
4.1.2. Computers 
Personal computers are cheaper and easier to operate than 
most mini-computers, and the latest models have sufficient 
speed and power for on-line photogrammetric applications. 
The ideal machine should contain l6k - 32k bytes user 
memory separate from the compiler, a memory cycle time of 
about 600 nano seconds, and processing speeds of e.g. 
6 ms for sine function and 0.15 ms for add/subtract using 
BASIC or FORTRAN. There should be adequte provision for 
interfaces to peripherals, disc storage and a display 
screen.