[postgis-users] ST_Buffer on a point can generate an extra vertex

[Mike Taves]

On Sat, 12 Dec 2020 at 11:10, Bruce Rindahl <bruce.rindahl at gmail.com> wrote:
> This was intended to get 48 points (12*4) evenly spaced around a point at (0.0) with a radius of 100.  The query above gives 49 points which makes sense (the starting point is duplicated).  However, if you increase the parameter to 13, you get 54 points instead of the expected 53.

Yes, this is an old bug that was resolved this year.
https://trac.osgeo.org/geos/ticket/743

It is fixed for GEOS 3.9.0 (nearly out) and probably in GEOS 3.8.2
(not yet released).