[postgis-tickets] [PostGIS] #4835: ST_Distance returning wrong results near the pole
PostGIS
trac at osgeo.org
Thu Jun 30 12:10:36 PDT 2022
#4835: ST_Distance returning wrong results near the pole
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Reporter: matthiasheuser | Owner: pramsey
Type: defect | Status: new
Priority: high | Milestone: PostGIS 3.3.0
Component: postgis | Version: 3.1.x
Resolution: | Keywords:
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Comment (by pramsey):
Incredibly, I found a fix for this issue that doesn't break the rest of
the jenga tower. It's small so I'll back patch it as far as seems
reasonable. Basically the point->edge distance routine projects a point
onto the plane defined by the edge, and then asks if that point is between
the edge-defining points. The code that was being used both tested for
between-ness (good) and also for on-the-plane-ness (which since we had
already constructed the point to be on-the-plane, we could take as read).
Making the test more appropriate for our needs side-steps a
precision/tolerance issue with the on-the-plane test.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4835#comment:13>
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