MapView regionThatFits set using horizontalAccuracy

Question

I'm looking for a method to convert meters to a mapview region.

CLLocation's horizontalAccuracy is a double, representing the accuracy in meters. regionThatFits: takes an MKCoordinateRegion which has a span with longitudeDelta and latitudeDelta. How can I convert meters to a longitude/latitude span?

Answer 1

Found an answer. It seems that 1 degree of latitude is equal to around 111 kilometers, or 111120 meters

- (MKCoordinateRegion)regionForAccuracyOfLocation:(CLLocation *)location
{
    CLLocationDegrees spanInDegrees = (CLLocationDegrees) (location.horizontalAccuracy / 222240);

    MKCoordinateSpan span = MKCoordinateSpanMake(spanInDegrees, spanInDegrees) ;
    CLLocationCoordinate2D coordinate = location.coordinate;
    MKCoordinateRegion region = MKCoordinateRegionMake(coordinate, span);

    return region;
}