- March 24, 2021
- orm gis latitude longitude location
- 1 (after 1 ratings)
Here's how to find the 10 closest locations to a point for a model that has latitude and longitude columns, if you're not using GeoDjango.
This runs a brute force distance calculation against every row, so it should only be used on smaller tables - probably less than 100,000 rows.
For larger tables you should use GeoDjango instead.
See also my TIL about this.
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from django.db.models import F from django.db.models.functions import ACos, Cos, Radians, Sin locations = Location.objects.annotate( distance_miles = ACos( Cos( Radians(input_latitude) ) * Cos( Radians(F('latitude')) ) * Cos( Radians(F('longitude')) - Radians(input_longitude) ) + Sin( Radians(input_latitude) ) * Sin(Radians(F('latitude'))) ) * 3959 ).order_by('distance_miles')[:10]
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