[postgis-devel] please review my assumption about segmentize and bbox

[Paul Ramsey]

For both curves and for geography the bounding box/volume is calculated to
take in the whole arc, even if the furthest extent of the arc does not
happen to have any vertices on it. So, if you density the arc/great-circle,
the box should not need to be re-calculated, since any new vertices will be
added into the existing arc.

On Sat, Nov 12, 2016 at 6:35 AM, Sandro Santilli <strk at kbt.io> wrote:

> On Sat, Nov 12, 2016 at 09:25:58AM -0500, Stephen Woodbridge wrote:
>
> > What about curved geometries? like arc segments. Is the BBOX defined
> based
> > on the true arc BBOX or the segmentized arc BBOX, if the later then
> changing
> > the segmentation of an arc could in theory change hte BBOX.
>
> Yep, this is similar to the point raised by Darafei (geography).
> To be honest I don't know how BBOX is computed for curves though.
>
> Once again though, topology does not support curves (nor geographies).
>
> --strk;
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/postgis-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-devel/attachments/20161112/c2ba32e8/attachment.html>