From: Paul Ramsey Date: Thu, 19 Nov 2009 00:54:42 +0000 (+0000) Subject: Attempt to clarify MULTIPOLYGON behavior in ST_SimplifyPreserveTopology (#240) X-Git-Tag: 1.5.0b1~206 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a177b867b9424b8c863b932f446663b6546906ec;p=postgis Attempt to clarify MULTIPOLYGON behavior in ST_SimplifyPreserveTopology (#240) git-svn-id: http://svn.osgeo.org/postgis/trunk@4857 b70326c6-7e19-0410-871a-916f4a2858ee --- diff --git a/doc/reference.xml b/doc/reference.xml index b6d95b53d..83db485e2 100644 --- a/doc/reference.xml +++ b/doc/reference.xml @@ -13779,10 +13779,10 @@ FROM (SELECT ST_Buffer('POINT(1 3)', 10,12) As the_geom) As foo; Returns a "simplified" version of the given geometry using the Douglas-Peuker algorithm. Will avoid creating derived geometries (polygons in particular) that are invalid. Will actually do something only with - (multi)lines and (multi)polygons but you can safely call it with - any kind of geometry. Since simplification occurs on a - object-by-object basis you can also feed a GeometryCollection to - this function. + (multi)lines and (multi)polygons but you can safely call it with + any kind of geometry. Output polygons and multipolygons will be no more + invalid than the inputs (that is, if the inputs have self-intersections, + this routine won't remove them, but neither will it introduce new ones). Performed by the GEOS module. Requires GEOS 3.0.0+