[geos-devel] ST_Snap

James Sewell James.Sewell at lisasoft.com
Tue Feb 28 18:57:15 EST 2012


I have some questions on ST_Snap on linestrings:

The other day Martin Davis commented on the GEOS list:

The ultimate solution is perform snap-rounding over the entire input set.  I don't think ST_Snap is doing this - AFAIK it's doing some heuristic-based snapping only.

I was under the impression that ST_Snap(a, b, x) snapped geom a to geom b within precision x. My understanding was that in practice this means that all lines in geom a are snapped to geom b if they are within x.

Am I misunderstanding how this works, or am I misunderstanding snap-rounding? Comments?

James Sewell
Solutions Architect
Ph: +61 3 8680 3250 Fax: +61 3 8680 3299
Level 9, 601 Bourke St, Melbourne Vic 3000


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