filter map annotations by distance

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i need some help towards the filter, how do i implement an algorithm that filters out related map annotations within the radius of user's location, thanks a lot guys! Any feedback is much appreciated! Thank you and have a nice day.

My code i think i have so far:

        CLLocationCoordinate2D coordinates;
        CLLocationDistance test = 1000; // set distance
        coordinates.latitude = [[row objectForKey:@"latitude"] doubleValue];// get user's latitude
        coordinates.longitude = [[row objectForKey:@"longitude"] doubleValue];

        MapAnnotation *annotation = [[MapAnnotation alloc] initWithCoordinate:coordinates title:titles subtitle:contents image:[row objectForKey:@"image"]]; // specify annotation's detail

        [self.mapView addAnnotation:annotation];// adding annotation into the map
        [annotation release]; 

asked 16 secs ago

Jessica gilbert

1

filter map annotations by distance