[postgis-users] Question on GEOMETRY type

孙琦 qsundw at gmail.com
Wed May 19 07:23:43 PDT 2010

Can anyone throw some lights on the question?


On Wed, May 19, 2010 at 6:27 PM, 孙琦 <qsundw at gmail.com> 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
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