Thank you Mark for your reply. So, as I thought, there is no solution doing this work using Lucene?
Thanks Sergio > Date: Sat, 1 Jan 2011 19:09:11 -0700 > From: [email protected] > To: [email protected] > CC: [email protected] > Subject: Re: [fw-general] Distance filtering using Lucene > > I don't have any experience with lucene but I do have experience with > querying geographic coordinates based on distance. If you were using > mysql or postgis you could store the coordinates as a point data type > and use a length or distance function to limit the result. Not sure > how lucene works but you will probably need to use math to calculate > the distance. If your coordinates are in degrees the math will be more > complex since a distance of 1 degree is different depending on the > direction and where it is. For example, 1 degree north is always the > same but one degree west is much farther at the equator than it is > nearer the poles. Converting the points to a projection that uses > meters instead of degrees would probably make the math easier. > > I quickly glanced through the Zend_Search_Lucene docs on querying and > didn't see any math functions so you may need to do a search that > brings back everything regardless of distance and then do the math > separately to filter out everything outside your distance range. I'm > sure you have your reasons for using lucene over sql but this could be > a reason to use sql instead. You can review the mysql spatial > extensions here: > http://dev.mysql.com/doc/refman/5.0/en/spatial-extensions.html > > Could you store ids and coordinates in a db, query that for distance > and then do a lucene search that's limited to those ids? Using sql for > the distance query has the added benefit of using a spatial index for > improved performance. > > > > > Mark > > On Sat, Jan 1, 2011 at 4:32 PM, Sergio Rinaudo <[email protected]> > wrote: > > > > Hi all, > > if I have the longitude and latitude stored in my lucene documents and I > > want to get all the documents from the index > > that are distant of a certain value from another longitude and latitude > > pair, what is the best or good solution to do that? > > > > Thanks > > > > Sergio > > > > > > > > -- > Have fun or die trying - but try not to actually die.
