From the course: Advanced iOS App Development: MapKit & Core Location
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Distance - iOS Tutorial
From the course: Advanced iOS App Development: MapKit & Core Location
Distance
- [Instructor] I lied a little about MapKit's regions being a rectangle and Core Location regions being a circle. More accurately, their rectangles are circles in planar geometry. The world is a globe, and that means these are global geometry, not planar. For small distances such as a kilometer or a mile, you won't be able to tell the difference. But there will be accuracy errors creeping in as you get bigger distances. Let's look at why. I'll use a pizza slice here to help me out. The pizza slice has an angle, which could be our latitude or longitude. If I draw a straight line against this angle, as we have with flat planar geometry, from one edge of the pizza to the other, we have a distance. That distance, however, cuts off some crust. While not everybody likes the crust, I happen to like all my pizza. On a circle, there's a lot longer distance along the outside of the crust. On a globe, that means an error in your distances between two points. Core Location and Core Maps assumes…
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