Our future work will also include the 
investigation of the performance of compact zoom 
lenses, since zoom lenses are needed in the 
proposed system and the experience in this 
respect is still insufficient (Wiley & Wong 
1990). When motorized theodolites are available, 
a program will be produced to automate the 
calibration and theodolite orientation. 
Furthermore, the function of fast automated 3-D 
determination of targets or distinct features 
based on the theodolite scanning principle will 
be developed. 
7. ACKNOWLEDGEMENT 
All the work was carried out at University 
College London while the author was studying for 
a Ph.D. degree there under the Technology 
Cooperation Project of the British Council. He 
would like to thank both the institutions and 
all the relevant staff, especially his 
supervisor Professor Ian Harley. 
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