Comments on: Calculating the radius of a coordinate using PHP

By: Mark

Mark — Tue, 06 Jul 2010 09:46:14 +0000

Ah ok, thanks Kevin. Actually I’m trying to write something using the foursquare API, and that only gives you output for a given lat/lng point – it doesn’t have a function where you can pass it a range of lat/lng values. So what I’m trying to do is figure out how to get the lat/lng values of 8 points around a centre – N, NE, E, SE, S, SW, W, NW – and plus those into the API instead…

By: kevin

kevin — Mon, 05 Jul 2010 20:18:09 +0000

A radius of a lat/lng point equates to a range, so this function will give you a range of lat/lng points to query a database with.

By: Mark

Mark — Mon, 05 Jul 2010 20:16:01 +0000

Am I right in thinking that this gives the lat/lng of two points then – one northeast and one southwest of a point?

By: Fredrick

Fredrick — Mon, 05 Jul 2010 13:25:01 +0000

I just like to thank you for this article, it made my day!

By: Rich

Rich — Thu, 01 Apr 2010 16:39:44 +0000

Nevermind, thanks anyway, I’ll see if I can make sense of it.

By: kevin

kevin — Tue, 30 Mar 2010 09:52:04 +0000

@Rich,

Nope, I condensed it down to this page as there was a lot of useless info in the 3 pages I had originally written. The math invovled can be taken from the function I’ve written. To use this function you’ll need a database that contains all the post codes including their corresponding longitude and latitude values.

By: Rich

Rich — Mon, 29 Mar 2010 18:55:10 +0000

Hi, I just wondered if you still had your step by step guide available for the PHP radius of a coordinate. I noticed you had it previously and intended to have a read through it.

Cheers
Rich