areas could have been completed using traditional field 
survey methods, but even this would have been a major 
undertaking. These areas were left incomplete, but 
sufficient detail has been represented to satisfy the clients 
needs, and if required this detail can be added at a later 
stage using the existing controlled photography. 
CONCLUSION 
Unfortunately most current CAD systems with all the 
geometric restraints they impose do not allow for the 
efficient production of these 3-dimensional models. This 
should not mean that such projects are not undertaken. On 
the contrary there are many potential new users of 
photogrammetry who create far more challenges and 
demand more from photogrammetrists and analytical 
photogrammetry than the traditional 2-dimensional map 
product. The answer to this modelling problem will not be 
easily solved. There are currently some 'solid' modelling 
CAD packages available but while it is not possible to 
undertake this modelling directly within the 
photogrammetric model the advantages are limited. 
There is a very real need for the 3-dimensional CAD 
model with all its inherent advantages over the 
2-dimensional product. It offers a potential new range of 
clients in a diverse range of industries. It also 
demonstrates that the traditional pigeon-holing of 
products to specific industries in this computer age is no 
longer valid. By learning more fully the needs of these 
industries there is a challenging and diverse future for this 
3-dimensional computer modelling by analytical 
photogrammetry. 
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