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Ordnance Survey Grid Reference to Latitude / Longitude Archive conversion of postal addresses to latitude and longitude using Google's interface - but what is I want to convert the Ordinance Survey's grid references into latitude and longitude? Google's interface doesn't support the OS units - and in any case it's "just" a a calculation. I have put quotes around the word "just" because it's actually a complex calculation that I had no desire to re-code from learned papers.The Perl command line program The PHP which calls up that Perl Descritpion of coordinate system and conversion algorithms (.pdf) Perl Cpan module Update = August 2008 I've also added code for the OPPOSITE mapping - Latitude and Longitude to OS Grid reference.here here here
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