Jason Roberts wrote: ... > For scenarios involving large numbers of features, I suspect it is much > harder to do it fast and within available memory. It is probably necessary > to do a multi-pass approach, where the first step operates only on the > spatial indexes of the layers involved. It is probably too slow--or at least > very suboptimal--to even read all of the features into memory, much less > call GEOS on them; all of that would happen in a later pass, when a subset > of features was identified via the spatial index pass....
I was intrigued to read the earlier thread you pointed out Jason, and to see also Jan's comment about spatial index handling. I would really love to see a common approach to adding spatial index files to my files (and even database connections done via a VRT) - and then having OGR understand how to use those indexes. That'd be pretty awesome in my opinion... not that I'm able to implement anything myself, but thought I'd raise a cheer around the idea ;-) Tyler
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