Find nearest by lat/long with Core Data

Question

I have an iPhone app with a Core Data database containing a list of locations, each with lat/long coordinates. How can I search for say the nearest 10 to my current location?

Answer 1

You need the Haversine formula for distance between lat / long pairs. You can have a calculated field for each object which returns it's distance from a set point, then order by this distance to get the nearest -> farthest.

See this article on Haversine

And here is an Objective-c version...

Objective-c Haversine