I’ve been working on a new iOS project that uses CoreLocation to determine some points. While CLLocation has a method for determining the distance between two locations (distanceFromLocation:
) it doesn’t have one for doing the opposite: calculating a second location based on a distance (and bearing) from the first.
So I added a category on CLLocation that performs this calculation:
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The other need I had was to calculate the bearing between two points:
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Both of these calculations use the formulas provided on the page Calculate distance, bearing and more between Latitude/Longitude points. This page has lots of information on the formulas and provides them in mathematical notation as well as examples translated to Javascript.
My ObjectiveC category incorporating these calculations is available from my Github account.