[postgis-users] Question on GEOMETRY type

[Paul Ramsey]

No, it's still around.

On Wed, May 19, 2010 at 8:25 AM, strk <strk at keybit.net> wrote:
> 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 <pramsey at opengeo.org>:
>> > 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 <qsundw at gmail.com> wrote:
>> >> Can anyone throw some lights on the question?
>> >>
>> >> Thanks,
>> >> Cheney
>> >>
>> >> On Wed, May 19, 2010 at 6:27 PM, Ëïçù <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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>> >
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> --
>
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