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.