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information to provide quantitative (e.g. position) as well as 
qualitative (e.g. object type) approximations, object 
extraction procedures can be greatly improved by 
minimizing the search space within which an object is 
sought, and using excellent approximations on the type and 
expected shape of the object to be extracted. Matching, an 
operation currently limited among digital imagery, is thus 
expected to evolve into an inter-database operation, with 
digital images matched to maps in digital format or other 
relevant geodatabases, for updating and augmenting them. 
6. OUTLOOK 
The substantial advancements in digital photogrammetry are 
bringing forward the full integration of digital imagery in 
geographic information systems. Coupled with 
advancements in GIS technology, this integration has 
become more clearly feasible. The potential gains from such 
an integrated photogeographic environment are expected to 
revolutionize not only the processes of digital information 
extraction and representation, but also the way in which 
traditional photogrammetric operations are carried out, as 
well as the final product offered to the public. Within this 
context, the role of photogrammetry for GIS data collection 
(through updating and database augmenting) is expected to 
evolve and become strengthened and more prominent, with 
images becoming information layers themselves, rather 
than simple tools for information extraction. 
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