[postgis-devel] GBOXF
Mark Cave-Ayland
mark.cave-ayland at siriusit.co.uk
Wed Nov 30 03:47:28 PST 2011
On 29/11/11 21:51, Sandro Santilli wrote:
>> Another case to think about would be GROUP BY, which works by
>> performing an equality comparison between bounding boxes - again,
>> two very similar yet distinct geometries could be considered equal.
>
> This is also true for two very different geometries yet having
> the same bounding box, so doesn't seem a good example to me.
> Ie:
>
> LINESTRING(0 0, 10 0, 10 10)
> LINESTRING(0 0, 10 10)
>
> I guess you were referring once again only to points ?
No, that would include polygons as well. I'm fairly sure that Paul has
used the bounding box GROUP BY as part of one of his many tutorials.
ATB,
Mark.
--
Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
http://www.siriusit.co.uk
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