[postgis-devel] WKB type

[strk at refractions.net]

On Thu, Sep 09, 2004 at 03:31:01PM -0700, Paul Ramsey wrote:
> 
> >And what about OGC conformance... do you think the binary transfer
> >format should be strict WKB (if such a thing exists) or a
> >postgis-custom format ?
> >
> >I'm thinking about:
> >	- SRID extension
> >	- 2d/3d/4d specification
> >	- optional BBOX 
> >
> >--strk;
> 
> AcK! No, AsBinary *must* return OGC WKB.
> If people want to get into a postgis-specific binary return type, they 
> can fill their boots using binary cursors and pulling the native objects 
> back directly.

Ok. So this would be:

	bytea AsBinary(geom, [endiannes]);
	geometry GeomFromWKB(bytea, [SRID]); 

	GeomFromWKB(AsBinary('SRID=14;POINT(0 0)'));
	-- will loose srid

	GeomFromWKB(AsBinary('SRID=32;POINT(0 0)'), 14);
	-- will change SRID

Note that current postgis WKB output contains custom 3d extension,
and LWGEOM will have the 4d extension.

--strk;

> 
> 
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