[postgis-devel] ST_Snap

[James Sewell]

Greetings,

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?

Cheers,
James Sewell
Solutions Architect
LISAsoft
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