Do we have something like pyramids for for vector data ? 

What I mean is having a FeatureSource (say, the boundary of Europe having 
100 000 vertices) and drawing the boundary on a 640x480 image.
I really do not need 100 000 points and therefore I make some 
generalizations, each as its own feature source, minimizing io traffic and 
cpu usage. 

It would be nice to have a (read only) FeatureSource as a Wrapper for all 
the generalizations (best design pattern would be a composite), which
selects the proper generalization (depending on world and pixel size) and 
returns a much smaller number of vertices. 

It is the same concept as we have for image pyramids (I think, 
AbstractGridCoverageReader has the logic built in). 

Opinions ? 


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