[postgis-devel] SnapToGrid(...) not 3d?

[strk at refractions.net]

On Tue, Nov 29, 2005 at 01:13:16PM -0800, Kevin Neufeld wrote:
> Hi all,
> It looks like the snaptogrid function drops z values. Is this a bug?

Nope, it's like that since the beginning.
Note that SnapToGrid removes consecutive points falling in
the same cell, so supporting Z (and/or M) would require a
definition of semantic for those cases (average?).

--strk;

> 
> 
> select asewkt(geomfromewkt('POINT(1.1234 2.23456 3.34567)'));
>            asewkt            
> -------------------------------
> POINT(1.1234 2.23456 3.34567)
> (1 row)
> 
> select asewkt(snaptogrid(geomfromewkt('POINT(1.1234 2.23456 3.34567)'), 
> 0.001));
>       asewkt      
> --------------------
> POINT(1.123 2.235)
> (1 row)
> 
> 
> Cheers,
> Kevin
> 
> 
> 
> -- 
> Kevin Neufeld,
> Refractions Research Inc.,
> kneufeld at refractions.net
> Phone: (250) 383-3022 
> Fax:   (250) 383-2140 
> 
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