# Is there a relation between EPSG 4326 coordinates and meters?

I have information about different locations in a Java `List`. Each `location` has it's coordinates (`longitude` and `latitude`) For example:

``````longitude = 2.37364
latitude = 42.38473
``````

I need to look up using an API which bus stations are near each `location` (in a radius of 500m).

I want to know how can I relate the coordinate system with meters to filter the search.

• There is an ellipsoidal relation between geodesic coordinates and meters over the ellipsoid. I do not know anything about `Java`, but you can look there: geographiclib.sourceforge.io/html/java – Gabriel De Luca Feb 10 '20 at 21:02
• Geographic degrees to geodesic meters is partial differential equation, only solvable through iterative means. You really want to find an open-source provider for this. – Vince Feb 10 '20 at 21:39
• For a search radius of 500m the earth is practically flat, and if you don't need much precision, you could scale the longitude by the lat-long aspect ratio at that latitude, then convert to approximate metres. Quick and dirty. Might get you 1m precision... – Spacedman Feb 10 '20 at 22:27
• possible duplicate of stackoverflow.com/questions/44249945/… – Ian Turton Feb 11 '20 at 8:53
• possible duplicate of stackoverflow.com/questions/36481651/… – Ian Turton Feb 11 '20 at 8:53