Search Script Zip Code Distance Option

[Fewski]

I have a search script that right now when you enter a zip code, it only finds ads that are in the zip code. I want it to have a few options (50 miles, 100 miles, 200 miles, and 500 miles).

Please let me know your quote.

Like I said, I have the script to do the search - I just need someone to add a zip code distance option.

Thanks

 

[Peter]

Just a note. Before you can do something like that you will need to buy a database such as the 1 http://www.teamredline.com/ offer.

This will give you the longitude and latitude of the zip codes which then enable you to work out the distance.

 

[jsp]

Longitude and Latitude are not implemented in google maps

 

[Peter]

Longitude and Latitude are not implemented in google maps

Who said anything about google maps. The op wanted to be able to work out the distance between 2 zip codes. Google maps was never mentioned.

 

[jsp]

easily the best, most efficient, and cheapest solution to your problem, but if not your interest..understood

 

[Peter]

If i remember correctly to calculate the distance between 2 points using data retrieved from google maps is quite complex. I am sure I have a book around somewhere that explains how to do it and it entails calculating the curvature of the earth etc.

 

[jsp]

Not actually too involved, as most of the most complex operations are integrated...Uses the Haversine formula, implemented in JavaScript is:


var R = 6371; // km
var dLat = (lat2-lat1).toRad();
var dLon = (lon2-lon1).toRad();
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;

where var d is your distance-
And no need to buy a zip code database, I have one you can have for free, if interested.

____________________
BUT, as far as what youre trying to do it sounds like some additonal iterations of your search script, in combination with a distance modifier would do the job, i have a good idea of what would be required to do this, if interested let me know