[postgis-users] Z and M coordinates seem inconsistent and barely supported

[Ben Harper]

Thanks - I see that EWKT works, but is there an equivalent mechanism for WKB?

SELECT AsBinary(GeomFromEWKT('POINT(0 0 0 0)'));

yield the exact same result as

SELECT AsBinary(GeomFromEWKT('POINT(0 0)'));



On Thu, Jul 2, 2009 at 5:56 PM, Paul Ramsey<pramsey at cleverelephant.ca> wrote:
> select geomfromewkt('POINT(0 0 0 0)');
>
>
> On Thu, Jul 2, 2009 at 8:51 AM, Ben Harper<rogojin at gmail.com> wrote:
>> I'm struggling to create a geometry field in PostGIS that stores Z and
>> M coordinates. Are these supported?
>> Some issues:
>> 1. I cannot create a ZM field. "Dimensionality must be 3 or less"
>> 2. GeomFromText() doesn't recognize "POINT Z (0 0 0)"
>> 3. GeomFromText() does parse (with a warning) "POINTM (0 0 0)", but it
>> appears the DB isn't really storing the Z coordinate.
>> 4. Using the C library interface, I can't get WKB geometry with Z to parse.
>>
>> Thanks,
>> Ben
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