[postgis-devel] Which intersection is faster?
jorgearevalo at libregis.org
Sat Mar 23 10:50:50 PDT 2013
Many thanks for the quick response. I can see is pretty fast. But, what about previous version of PostGIS? Say 2.0. Is there any significant difference between both versions?
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El sábado 23 de marzo de 2013 a las 18:30, Bborie Park escribió:
> I'd suggest using the variant that runs in raster space. If I
> remember correctly, some changes have been made to this in 2.1.
> On Sat, Mar 23, 2013 at 10:20 AM, Jorge Arévalo
> <jorgearevalo at libregis.org (mailto:jorgearevalo at libregis.org)> wrote:
> > Hello,
> > I don't know if this is a naive question, but in ST_Intersects description (http://postgis.net/docs/manual-2.0/RT_ST_Intersects.html) I read:
> > "Depending on the order that the raster and geometry is passed to ST_Intersects(), the test will operate in either raster-space or geometry-space. If ST_Intersects(raster, ....), the test is in raster-space (the geometry is converted to a raster). If ST_Intersects(geometry, ...), the test is in geometry-space (the raster is converted to a set of pixel polygons)."
> > My question: in equal conditions, which version should be faster?
> > ST_Intersects(raster, vector) --> in raster space
> > ST_Intersects(vector, raster) --> in vector space
> > Many thanks in advance,
> > --
> > Jorge Arevalo
> > Freelance developer
> > http://www.krop.com/jorgearevalo
> > http://about.me/jorgeas80
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