Find best longitude/latitude match from an array of possible locations

I have a plist with 12 objects with unique keys (let's say 1, 2, 3, etc). Each object contains an array (key: clubLocations) with 100 - 200 objects.

Each object in the clubLocations array contains a longitude and latitude key with a club's location.

I would like some assistance in creating a method which loops through each object for 开发者_如何学JAVAevery clubLocations in every 12 objects and finds out which clubLocation is the closest match to the users coordinates.

So basically object 1/2/3/etc -> clubLocations objectAtIndex:0/1/2/3/etc -> best match?

I have the user's coordinates, so "just" need assistance to find the closest locations from my plist. Thank you in advance and please do not hesitate to ask in a comment if I am not making myself clear enough.

In pseudocode:

min_distance = MAXINT
closest = None
for obj in objects:
  for club in obj.clubLocations:
    d = distance(club.longitude, club.latitude, user.longitude, user.latitude)
    if d < min_distance:
      min_distance = d
      closest = club