#25498: PostGIS Distance lookups use ST_Distance_Sphere() and not ST_Distance()
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Reporter: iambibhas | Owner: nobody
Type: Bug | Status: new
Component: Documentation | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Changes (by claudep):
* needs_better_patch: 0 => 1
* stage: Unreviewed => Accepted
Comment:
You are right in that the documentation is not up-to-date. However, it's a
bit more complicated than that. The real function used depends on the type
of the geometry field in the database. You can see the logic here:
https://github.com/django/django/blob/master/django/contrib/gis/db/backends/postgis/operations.py#L39
If the field is geodetic (latitude/longitude), `ST_Distance_Sphere` is
used by default (with spheroid as an option). If the field has projected
coordinates, `ST_Distance` is used by default.
--
Ticket URL: <https://code.djangoproject.com/ticket/25498#comment:3>
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