Calculate distance between two Lattitude Longitude Coordiantes using ColdFusion 6

I see there are many formulae on this site for doing this. But I need to know how to do it using
Cold Fusion.

I will have two coordinates I need to calculate the distance dynamically as I run a Schedulted CF task to mail members of the data base:- .  to see if a posted opportunity is within their defined area - they specify how many KMS they are prepared to travel.

Eg I will have

        MemberLat = "37.6922361"
        MemberLng = "-97.3375448"

          OpportunityLat = "56.1303660"
        OpportunityLng = "-106.3467710"

How to calulate the distance between in Kilometers using CF6?

Thanks for your help/
Ian WhiteOwner and FounderAsked:
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gdemariaCommented:
You need the equation, then it's all down hill.

Here is one in SQL

http://www.petefreitag.com/item/622.cfm


Below is code in Coldfusion...

http://www.zipcodeworld.com/samples/distance.cfm.html


<cfset radlat1 = ((pi() * lat1)/180)>
<cfset radlat2 = ((pi() * lat2)/180)>
<cfset radlon1 = ((pi() * lon1)/180)>
<cfset radlon2 = ((pi() * lon2)/180)>
<cfset theta = lon1-lon2>
<cfset radtheta = ((pi() * theta)/180)>
<cfset dist = ((60 * 1.1515) * (180 / pi()) * (ACos((Sin(radlat1) * Sin(radlat2)) + (Cos(radlat1) * Cos(radlat2) * Cos(radtheta)))))>

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Ian WhiteOwner and FounderAuthor Commented:
Thanks it brings back a result ok.  Do you know if the CF code returns miles or kilometers. It does not say in the documentation. Give it talks about zip codes - does this mean miles?

Thanks
Ian
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gdemariaCommented:

 Yea, it's miles.   Just convert the result to kilometers..
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Ian WhiteOwner and FounderAuthor Commented:
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