ST_OrientedEnvelope returning parallelogram

[Tom Payne]

Riccardo's original data is in EPSG:4326 (I assume) but Riccardo's
screenshot is in EPSG:3857 (geosjon.io's default). Could this be the reason?

On Fri, 8 Mar 2024 at 22:39, Paul Ramsey <pramsey at cleverelephant.ca> wrote:

> I’m seeing the same thing as Martin, the output is rectangular. I see it
> using the JTS test builder. I see it using QGIS.
>
> This is the output, same as you get:
>
> POLYGON((-71.25975582815524 42.470679599674035,-71.25956768540266
> 42.47056830210077,-71.25960032476851 42.4705131269523,-71.25978846752108
> 42.470624424525546,-71.25975582815524 42.470679599674035))
>
> It is a rectangle. You can confirm by checking the angle between the first
> two edges.
>
> select degrees(st_angle('LINESTRING(-71.25975582815524
> 42.470679599674035,-71.25956768540266 42.47056830210077)',
> 'LINESTRING(-71.25956768540266 42.47056830210077,-71.25960032476851
> 42.4705131269523)'));
>
> Which is 90 degrees.
>
> P.
>
> > On Mar 8, 2024, at 1:29 PM, Erik Wienhold <ewie at ewie.name> wrote:
> >
> > On 2024-03-08 21:40 +0100, Martin Davis wrote:
> >> Why do you think this result is wrong?
> >
> > Because I see that the resulting geometry is a parallelogram, as
> > reported by Ricardo.
> >
> >> It's the same as the result I'm seeing, and is an oriented rectangle
> >> enclosing the input (apart from minor issues with numerical
> >> precision).
> >
> > Are we seeing the same rendering?  Your PostGIS and geosop outputs are
> > the same as mine.  And I'm wondering where you got that rendering[1]
> > from that you've attached in your initial reply.  It shows a
> > parallelogram in blue as input and the correct oriented envelope in red
> > as result.  But it's not even the same parallelogram that Ricardo is
> > reporting.  Where did you get that input from?
> >
> > I attached the rendering of the input and output geometries that I got.
> > The geometries look identical to what Ricardo showed.
> >
> > [1]
> https://lists.osgeo.org/pipermail/postgis-users/attachments/20240308/e5c3247e/attachment.png
> >
> > --
> > Erik
> > <img.png>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20240308/e64d0b1d/attachment.htm>