Posted by Greg Donald on 09/27/43 11:05

On Tue, 11 Jan 2005 19:57:15 +0000, symbulos partners
<partners@symbulos.com> wrote:
> We would like to implement a geographic search engine.
>
> We have a list of places, the user enters a postcode + a radius in kms and
> the search engine returns a list of places within a certain radius.

So often php-general is graced with the presence of people with
multiple personalities.. or are you really the borg? :)

> Any body has any experience with anything similar?

I coded a zip code to distance calculater last week.

x = 69.1 * ( zip2.lat - zip1.lat )
y = 69.1 * ( zip2.lon - zip1.lon ) * cos( zip1.lat / 57.3 )
miles = sqrt( x^2 + y^2 )

This does not take into account the curve of the earth. In addition
you'll need a db with the latitude and longitude for each zip code.


--
Greg Donald
Zend Certified Engineer
http://destiney.com/

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