Converts NOAA string into a CLLocationCoordinate2D coordinate

Location from NOAA String

- (CLLocationCoordinate2D)locationFromString:(NSString *)locationString{
    
    CLLocationCoordinate2D coordinate;
    
    // Extract individual components
    NSMutableArray *locationColumns = [NSMutableArray arrayWithArray:
                                       [locationString componentsSeparatedByCharactersInSet:
                                        [NSCharacterSet whitespaceCharacterSet]]];
    
    // Remove empty objects
    [locationColumns removeObject:@""];
    
    // Build latitude prefix
    NSString *latitudePrefix;
    if(![[locationColumns objectAtIndex:1] isEqualToString:@"N"]){
        latitudePrefix = @"-";
    } else{
        latitudePrefix = @"";
    }
    
    // Build longitude prefix
    NSString *longitudePrefix;
    if(![[locationColumns objectAtIndex:3] isEqualToString:@"E"]){
        longitudePrefix = @"-";
    } else{
        longitudePrefix = @"";
    }
    
    // Create  and return coordinate
    coordinate.latitude = [[latitudePrefix stringByAppendingString:[locationColumns objectAtIndex:0]] doubleValue];
    coordinate.longitude = [[longitudePrefix stringByAppendingString:[locationColumns objectAtIndex:2]] doubleValue];
    return coordinate;
}