[postgis-devel] Precision Reduction?

[Martin Davis]

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.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-devel/attachments/20201111/576662a1/attachment.html>