Relative Position in PHP between 2 points (Lat/Long)
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by Brian H
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Published on 2010-05-18T18:17:18Z
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2010/05/18
18:20 UTC
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I have a database of airports with Latitude and Longitude for each point. I want to run a PHP script to find all airports that are nearby a given airport, with their distance and relative direction.
I.e. for Airport KLDJ (40-37-02.810N 074-14-40.539W)
Airport Nearby
KJFK - John F Kennedy Airport (21.2 nm NE) (40-38-23.104N 073-46-44.132W)
I have used code from http://www.movable-type.co.uk/scripts/latlong.html to find distance, and tried to use it to find bearing, which might not be right.
//BEARING RHUMB LINE
$phi = log(tan($lat2/2+pi/4)/tan($lat1/2+pi/4));
$distance['bearing'] = (rad2deg(atan2($theta, $phi)) +180) % 360;
I basically want to run all points through this script and find the distance, which I have already, but then the direction. (i.e. N, S, W, E, NW, SW, NE, SE)
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