How to filter a django model with latitude and longitude coordinates that fall within a certain radius
django, haversine, python
Solution
But you can always make proposed by Brian approach better by filtering the results from previous step (which hoepfully should be smaller subset) and for each you check either they are within the radius.
Your user is in black point. Square approximation given by Brian return green but also orange points. The divernce in distance can be significant in worst case user have to go sqrt(2) times further than expected (extra 40% of distance). So for all orange and green points it is worth to check if their distance from black point (e.g euclidian one if this are really short distances e.g navigation in city) is not greater than assumed radius.
UPDATE:
If you would like to use Haversine distance or (better) mentioned GeoDjango hava a look on this snippet comparing two django views dealing with nearby search:
https://gist.github.com/andilabs/4232b463e5ad2f19c155
Problem
I have the following model. ``` class Location(models.Model): name = models.CharField(max_length = 128, blank = True) address =models.CharField(max_length = 200, blank= True) latitude = models.DecimalField(max_digits=6, decimal_places=3) longitude = models.DecimalField(max_digits=6, decimal_places=3) def __unicode__(self): return self.name ``` If my current latitude & longitude is: ``` current_lat = 43.648 current_long = 79.404 ``` I did some research and came across the Haversine Equation which calculates the distance between two location coordinates. Below is the equation I found: ``` import math def distance(origin, destination): lat1, lon1 = origin lat2, lon2 = destination radius = 6371 # km dlat = math.radians(lat2-lat1) dlon = math.radians(lon2-lon1) a = math.sin(dlat/2) * math.sin(dlat/2) + math.cos(math.radians(lat1)) \ * math.cos(math.radians(lat2)) * math.sin(dlon/2) * math.sin(dlon/2) c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a)) d = radius * c return d ``` I would like to return all the Location objects that fall within a 10 km radius, how can I filter it in such a way that it will only return all the Location objects that fall within this 10 km radius? ``` LocationsNearMe = Location.objects.filter(#This is where I am stuck) ``` Is there anyway I can implement the Haversine equation into the filtering so that it only returns the location objects that fall within a 10 km radius? I'm looking for a well detailed answer. Appreciate the help.