Zip Code Radius Calculation C# SQL MySQL: Zip Code Radius Calculation C# SQL MySQL

Zip Code Radius Calculation C# SQL MySQL

Asked by: slink9

I have found http://www.experts-exchange.com/Database/GIS_and_GPS/Q_23725276.html and understand the 1 degree per 60 nautical miles calculation somewhat. If I want to see a five mile radius how do I utilize the calculation?

The programming language is C# and database used is MySQL. I want to look up all zip codes within a certain radius (generally five miles) of a specific zip code. Samples for distance calculation are plentiful but radius calculation doesn't seem to be so simple. Any help on this is greatly appreciated.

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strickdd's link on the Java ZIP library already contained your answer it was stored in the function called GetZipRadius()

It is a little cryptic since I don't know postgreSQL but I think the logic is something like this:
1) Get the Lat/Lon for the requested zip code
2) For each zip code in Zips
Find the values where (111.3*lon-CenterLon*Cos(centerLat/57.3)))^2 +
(111.3*(lat- CenterLat))^2
< radius^2

CREATE OR REPLACE FUNCTION %YOURSCHEME%.get_zipradius(zip "varchar", radius float8)
  RETURNS refcursor AS
$BODY$
DECLARE
lon_data float8;
lat_data float8;
zip_data varchar;
zips refcursor;
BEGIN
    SELECT lat,lon INTO lat_data,lon_data FROM zipcode WHERE zipcode=zip;
       Store the lat in CenterLat
       Store the long in CenterLon   (I renamed these for clarity)
    open zips for
    SELECT zipcode FROM zipcode 
    WHERE (POW((111.3*(lon- lon_data)*cos(lat_data/57.3)),2)+POW((111.3*(lat- lat_data)),2))<(radius*radius);
    RETURN zips;
END;
  $BODY$
  LANGUAGE 'plpgsql' VOLATILE;

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Zip Code Radius Calculation C# SQL MySQL

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