#22830: GeoDjango dwithin errors when using django.contrib.gis.measure.D
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Reporter: django@… | Owner: nobody
Type: Bug | Status: closed
Component: GIS | Version: 1.6
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by claudep):
* status: new => closed
* needs_better_patch: => 0
* resolution: => invalid
* needs_tests: => 0
* needs_docs: => 0
Comment:
The error message is pretty clear. As your objects are in geographic
coordinates (geometry fields default to WGS84), you have to provide the
distance as degree units. This is for example matching the PostGIS
definition:
{{{
boolean ST_DWithin(geometry g1, geometry g2, double precision
distance_of_srid);
}}}
`distance_of_srid` being degrees for WGS84. So the `5` that works in your
example means 5 degrees, not 5 km!
You could argue that !GeoDjango could automatically cast geographic fields
to geometry types when distance is a `Distance` object. It is
unfortunately not as smart currently. See #17635 for a similar feature
request (but in the opposite direction).
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Ticket URL: <https://code.djangoproject.com/ticket/22830#comment:1>
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