On Wed, May 19, 2010 at 07:43:03AM -0700, Paul Ramsey wrote: > If you have an older version of PostGIS, the zmflag() function also > returns the information you need.
Which was even more useful as you could get the whole information with a single function rather than two, and hitting less keystrokes too! :) Was that function deprecated ? --strk; > 2010/5/19 Paul Ramsey <[email protected]>: > > ST_NDims() returns the number of dimensions, but that doesn't > > distinguish between XYM and XYZ. > > The ESRI compatibility functions SE_IsMeasured() and SE_Is3D() (hey, > > they are useful after all!) return the information you are looking > > for. > > > > P > > > > On Wed, May 19, 2010 at 7:23 AM, Ëïçù <[email protected]> wrote: > >> Can anyone throw some lights on the question? > >> > >> Thanks, > >> Cheney > >> > >> On Wed, May 19, 2010 at 6:27 PM, Ëïçù <[email protected]> wrote: > >>> > >>> Hi experts, > >>> > >>> Do we have a way to resolve the third dimensionality of GEOMETRY data? As > >>> known, those single types(POINT, LINESTRING, POLYGON....) all have the > >>> corresponding XYM versions with suffix M. Thus, if we have > >>> three-dimensionality feature, we can discriminate its third dimensionality > >>> as Z or M by the returned geometry type. However, if the mixed-typed > >>> (GEOMETRY) is used, it seems that it's hard to resolve the 3rd > >>> dimensionality. By the Postgis 1.5.1 manual, no GEOMETRYM type is provided > >>> to fix the issue. So can someone tell me if there is another way to do the > >>> work? > >>> > >>> Thanks, > >>> Cheney > >> > >> > >> _______________________________________________ > >> 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 -- () Free GIS & Flash consultant/developer /\ http://strk.keybit.net/services.html _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
