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Does the span for MKCoordinateRegion represent the distance from the center to each boundary or the distance from boundary to boundary?
If I want to calculate the boundaries of the region to I add/subtract the span from the center or do I need to /2?
lowerLatitude=center-span.latitudeDelta
or
lowerLatitude=center-(span.latitudeDelta/2)
Running this code:
self.mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2DMake(0.0, 0.0), MKCoordinateSpanMake(23.5, 10.0));
I was able to see as far north as the border of the Western Sahara, and as far south as the Etosha National Park; as far west as the west cosast of Senegal; and as far east as N’Djamena.
Based on that, and a little time with Google Maps, it appears that the span is a total of 47 degrees north-south, and 20 degrees west-east.