to read more. The challenge is to structure the 
photo interpretation knowledge in a way that 
supports the mental models that students may 
create when they use the photointerpretation 
hypermedia system. 
Progress in representing photointerpretation 
knowledge in hypermedia and knowledge 
bases will be parallel to progress made in 
many closely related scientific and technical 
fields such as knowledge-based spatial data 
handling systems, distributed knowledge- 
based interactive blackboards, fuzzy 
computer system architectures, parallel 
computer system architectures, graphic user 
interfaces, visualization, 3-D graphics, and 
natural languages. 
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