[postgis-devel] Precision Reduction?
Martin Davis
mtnclimb at gmail.com
Wed Nov 11 18:13:14 PST 2020
For polygonal geometries, yes, ST_Union with a precision is the same as
precision reduction.
However, for lines ST_Union might change the topology more than is
required/expected, since it merges and nodes lines. And for MultiPoints it
will merge identical points. In these cases ST_SnapToGrid is safer/better
to use.
On Wed, Nov 11, 2020 at 11:23 AM Darafei "Komяpa" Praliaskouski <
me at komzpa.net> wrote:
> I expect to be able to get the result of this function via
> ST_UnaryUnion(geom, precision), or, if that's not available, as
> ST_Union(geom, 'GEOMETRYCOLLECTION EMPTY', precision) for the most cases
> with GEOS 3.9.
>
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