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 <e...@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>