On Thu, Feb 03, 2011 at 10:25:08AM +1030, james.sew...@lisasoft.com wrote:
(Crossposting to GEOS list)
I see. So the difference between the GeometryNoder with a PrecisionModel and
using ST_Snaptogrid from PostGIS on the input geometries is that the
GeometryNoder snaps all nodes which are
(Crossposting to GEOS list)
I see. So the difference between the GeometryNoder with a PrecisionModel and
using ST_Snaptogrid from PostGIS on the input geometries is that the
GeometryNoder snaps all nodes which are created by the noding process as it
works?
This seems like an elegant solution
Yes, GeometryNoder uses true snap-rounding, whereas ST_Snaptogrid just
does vertex rounding. Snap-rounding is more complex and slower, but is
much more powerful in terms of increasing robustness. (In fact, as far
as I am aware, it's the only real solution to provide fully robust
noding using
