README

This is a PHP library for doing the conversations around the coordinate systems used for Ordnance Survey Open Data only.

Most of the Open Data comes in Easting/Northing. It needs converting to Latitude and Longitude. Further more, this is in OSGB36, and you probably want your Lat/Lng in WGS84, which is the same projection Open Street Map and Google Maps use.

I am not an expert in mapping systems. I cobbled this together from other sources based on my needs. I would love to retire it if someone else has a PHP library that does this with a permissive license.

Install via Composer

https://packagist.org/packages/jmbtechnologylimited/osmaths

composer require jmbtechnologylimited/osmaths

Use

$en = new EastingNorthing($inEasting, $inNorthing);
$latlng = $en->toLatLngOSGB36()->toLatLngWGS84();
print $latlng->getLat();
print $latlng->getLng();

Code Standards

Every object is immutable, so you can pass around data objects without worrying they will be changed.

License

BSD License

Note this software does not contain any actual data from the Ordnance Survey. You must get that yourself, and agree to their license to.

Sources and References that have been helpful

• https://www.ordnancesurvey.co.uk/business-and-government/products/opendata-products.html
• https://www.ordnancesurvey.co.uk/docs/support/guide-coordinate-systems-great-britain.pdf
• http://www.movable-type.co.uk/scripts/latlong-gridref.html