[postgis-users] Understanding 3d bbox filtering support

Andrea Aime andrea.aime at geo-solutions.it
Thu Jan 19 05:14:59 PST 2017


On Wed, Jan 18, 2017 at 5:13 PM, Rémi Cura <remi.cura at gmail.com> wrote:

> Hey,
> I can't test right now,
> but :
>  - you have the same srid for object and bbox right?
>

Err... the box3d does not seem to have a srid, nor I could find a way to
assign one.


>  - I remember Sandro discussing this case
>

I searched in postgis-users before sending and again now, but could not
find any.
I've now searched in postgis-devel and found a thread you started on the
topic instead:
http://osgeo-org.1560.x6.nabble.com/BOX3D-strange-behaviour-td5251231.html

So... it seems that the z gets dropped eh? I see a pull request to fix it
but it seems it has
been closed and the associated ticket marked as "wont' fix":
https://trac.osgeo.org/postgis/ticket/3466

Soo... should I do 2d filtering using && and then do the z filtering using
ST_Zmin/ST_ZMax?

Cheers
Andrea

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