MySQL Forums
Forum List  »  GIS

Re: Zip Code Proximity search
Posted by: Felix Sheng
Date: October 22, 2004 07:17AM

Gregor Melhorn wrote:
> The problem is, I loose performance, since I need
> the database to look at each zip in the database
> (about 20 000 in Germany) for each request,
> calculate the distance and afterwards do a sort on
> it, since I want the zips sorted by distance.
>
> This is by no means a solution for a
> high-performance application, but thanks anyway
> for your help...


Wait.. I'm not sure I understand - you don't need the database to do any sorting.
With one quick calculation in your application you determine a high and low latitude
and longitude. You then query the database for all zips in between those which should
be a blazingly fast index lookup.

Then once you have this small subset of zips in your application you can run the
more compute intensive distance calculations in your application on this small set
of zip codes.

So.. a one step calculation in your app, then you do a very quick index lookup
in the database and finally do the required more intensive calculations back in your
application - but over a *very* reduced set of zip codes that are almost all in your
required radius.

felix

Options: ReplyQuote


Subject
Views
Written By
Posted
28053
October 19, 2004 06:04AM
10836
October 19, 2004 07:55AM
9237
October 19, 2004 11:14AM
10277
October 21, 2004 09:28AM
9163
October 19, 2004 06:59PM
7614
October 20, 2004 07:39AM
7628
October 21, 2004 09:10AM
Re: Zip Code Proximity search
8820
October 22, 2004 07:17AM
6759
October 23, 2004 02:48AM
6220
October 23, 2004 03:09AM
6312
October 23, 2004 03:12AM
6205
October 23, 2004 02:59PM
7982
October 24, 2004 12:34PM
5513
October 24, 2004 01:31PM
13108
October 21, 2005 10:21AM
5565
D C
January 28, 2006 05:24AM
5110
March 02, 2006 04:24PM
7208
October 09, 2007 09:28AM
5734
December 06, 2005 05:34AM
7002
December 06, 2005 06:36AM
5306
December 24, 2005 01:10PM
8823
December 26, 2005 03:49PM
5432
October 09, 2007 09:36AM
29331
December 13, 2007 04:10PM
6175
April 05, 2006 02:59PM
4697
May 02, 2006 03:22PM
5659
May 05, 2006 09:44AM
14503
June 25, 2006 09:32PM
5487
August 30, 2006 12:54PM
5974
July 14, 2007 01:09AM
7629
November 03, 2006 10:25AM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.