[postgis-devel] Re: [postgis-users] GIST index speed

[Martin Davis]

Yes, GEOS has CoordinateSequences, and in fact these were introduced 
first in GEOS to allow exactly this option.  I assumed that this was 
already being done - someone correct this if it's wrong.

The PreparedGeometry concept is in GEOS as well.  It is another, 
possibly more important use for caching.  It caches a lot of data 
structures, which provides a major speedup for spatial predicates.

Markus Schaber wrote:
> Hi, Tom,
>   
>
> But I had another idea this morning. 
>
> Mark, does GEOS have custom coordinate sequences like JTS? Then you
> simply could construct a geometry wrapper that does not copy the
> coordinates, but references the detoasted data "in place". That should
> work at least on those platforms which support non-aligned accesses.
>
>
>   

-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022