It's a "known issue". The GEOS library that is doing the Union operation only supports x/y/z, there is no room in its model for an m ordinate. Only idea would be a re-working of GEOS to support m, which is probably already ticketed, but unfunded.
P. On Mon, Nov 21, 2011 at 2:53 AM, Lauri Kajan <[email protected]> wrote: > Hi all, > > I aked this before but no answers. Does anybody have any ideas? > > I'm trying to make a union of geometries with M-values. > But ST_Union seems to drop all the M-values. > > Or am I doing something wrong? > Here is a sample query: > select st_asewkt(st_union('LINESTRINGM(0 0 0, 1 1 > 1)'::geometry,'LINESTRINGM(1 1 1, 2 2 2)'::geometry)); > Output of this is > "MULTILINESTRING((0 0,1 1),(1 1,2 2))" > > Same happens with 4D LINESTRING geometries. Output is only XYZ. > > Is there a other way to accomplish what I want or is this a bug? > > > > Thanks > > -Lauri > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
