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I am receiving multiple restaurants' latitude/longitude from a server. I want to calculate the distance between each restaurant and the user's current latitude/longitude.
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First, subtract y2 - y1 to find the vertical distance. Then, subtract x2 - x1 to find the horizontal distance. Don't worry if the subtraction yields negative numbers. The next step is to square these values, and squaring always results in a positive number.
from math import cos, asin, sqrt, pi def distance(lat1, lon1, lat2, lon2): p = pi/180 a = 0.5 - cos((lat2-lat1)*p)/2 + cos(lat1*p) * cos(lat2*p) * (1-cos((lon2-lon1)*p))/2 return 12742 * asin(sqrt(a)) #2*R*asin...
You can use distanceFromLocation: method of CLLocation which returns the distance in meters between two CLLocation's.
CLLocation *currentLoc = /* Assume you have found it */;
CLLocation *restaurantLoc = [[CLLocation alloc] initWithLatitude:restaurantLat longitude:restaurantLng];
CLLocationDistance meters = [restaurantLoc distanceFromLocation:currentLoc];
// Go ahead with this
Once you have a list of places (one way or the other) you can the get the distance to (or from) these using CoreLocation to calculate this with distanceFromLocation:
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