Re: FN-FORUM: Postcode distance matching

date posted 1st February 2005 15:36

Gareth Griffiths wrote:

> See my other reply as well, but you can't really do this and be accurate
> as the values given in that CSV are lat/long and not straight "X" and "Y",
> so you need to do something called "Great Circle" range finding or something
> like that, which that offensively long formula I posted apparently does.
>
> I won't pretend to understand it though ;)
>
> Regards,
> Gareth Griffiths

I think I'm going to offer them a menu of the pay ones (ta for the
suggestions folks) and a home made system that would be something in
between my thing and your thing (probably using my thing to get a ranked
list of close ones out, and then your formula to work out the actual
distances) - and let them pick which they fancy.

Cheers for the help all (speshly mr Gareth - Word.)

ttfn
dan

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