[postgis-users] ST_Subdivide creates nodes outside original polygon

[Darafei "Komяpa" Praliaskouski]

Hi,

Can you share a testcase?
Are you running PostGIS 2.5+ so ST_Subdivide will try to reuse the original
node?

On Tue, Nov 26, 2019 at 7:24 PM Eduardo Ramos <duda.ramos at gmail.com> wrote:

> Hello all.
>
> I'm exploring the function ST_Subdivide(with type geometry) and noticed
> that the nodes that this function creates to divide the original polygon
> are missing the polygon edges by ~6cm.
>
> Here is an example:
>
> [image: image.png]
> This is originating some issues when using the ST_Intersects because the
> new polygons generated by ST_Subdivide are intersecting polygons that were
> not being intersected before.
>
> I guess this must be a matter of numeric precision but I we can't control
> the precision or the tolerance in either of the two functions (ST_Subdivide
> and ST_Intersects).
>
> Is there a way to configure the precision of ST_Subdivide or to play with
> the ST_Intersects tolerance?
>
> Any ideas or suggestions?
>
> Thanks,
> Eduardo
>
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-- 
Darafei Praliaskouski
Support me: http://patreon.com/komzpa
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