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12.07.2002 at 04:02PM PST, ID: 20418667
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7.4

Store Locator - calculating distance formula on database records and returning results

Asked by miamitons in ColdFusion Application Server

Tags: , , ,

The goal is a store locator whereby a user would enter their zip code and find the top 25 closest store locations. I have a table with the stores' information (incl zip codes). I also have a table with latitude and longitude references for every zip code.

The user would enter their zip code into a form. CFQUERY would find the lat and lon for that zip code (from the ZipCodes table). The next step is to calculate the distance between the user criteria and every record in the store table, and to sort the distances.

Here is the formula to compute distance between two sets of latitude and longitude:

<CFSET Distance = SQR((69.1*(Zip2Lat-Zip1Lat))*(69.1*(Zip2Lat-Zip1Lat))+(69.1*(Zip2Lon-Zip1Lon)*COS(Zip1Lat/57.3)*(69.1*(Zip2Lon-Zip1Lon)*COS(Zip1Lat/57.3))))>

The question is in how I would run the calculation for each record and return the results as if it were a query.

Here are the tables and pertinent fields I'm working with:

ZipCodes
-------------
ZipCodeID
ZipCodeZip
ZipCodeLatitude
ZipCodeLongitude

Dealers
-------------
DealerID
DealerName
DealerZip

****

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[+][-]12.07.2002 at 04:18PM PST, ID: 7548808

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[+][-]12.07.2002 at 04:50PM PST, ID: 7548869

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[+][-]12.08.2002 at 09:53PM PST, ID: 7552605

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[+][-]12.09.2002 at 07:08AM PST, ID: 7554271

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About this solution

Zone: ColdFusion Application Server
Tags: distance, formula, calculate, store
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Solution Provided By: TallerMike
Participating Experts: 4
Solution Grade: A
 
 
[+][-]12.09.2002 at 07:09AM PST, ID: 7554280

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[+][-]12.09.2002 at 07:32AM PST, ID: 7554417

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[+][-]12.09.2002 at 08:29AM PST, ID: 7554739

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[+][-]12.09.2002 at 08:40AM PST, ID: 7554805

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[+][-]12.09.2002 at 08:45AM PST, ID: 7554834

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