Actually, for what he wants, you don't need anything fancy.  A simple
multi-column index is enough.

The R-Tree is to allow queries of a sparse dataset, that might also
have overlaps.

So: A simple index for your background imagery.  An R-Tree index for
the features added on top of your background imagery.

--David Garfield

Enrico Thierbach writes:
> Hi,
> 
> I think an R Tree is what you are after.
> 
> http://www.sqlite.org/rtree.html
> 
> /eno
> 
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