Working with coordinates in iOS

SetPoints.m

for (NSDictionary *dict in [samplePlist objectForKey:@"map_points"]) {
        
	//	NSLog(@"%lf %lf %@", [[dict objectForKey:@"latitude"] doubleValue], [[dict objectForKey:@"longitude"] doubleValue], [dict objectForKey:@"title"]);
		
		
	CLLocationCoordinate2D coord = { [[dict objectForKey:@"latitude"] doubleValue] , [[dict objectForKey:@"longitude"] doubleValue] };
		
	MPoint *point = [[MPoint alloc] initWithCoordinate:coord];
		
	[point setTitle:[dict objectForKey:@"title"]];
	[points addObject:point];
		
	[point release];
}	
[mapview addAnnotations:points];
	
MKCoordinateRegion region;
region.center.latitude = [[points objectAtIndex:0] coordinate].latitude;
region.center.longitude = [[points objectAtIndex:0] coordinate].longitude;
region.span.longitudeDelta = 0.000796f;
region.span.latitudeDelta = 0.000908f;
	
[mapview setRegion:region animated:YES];