Hi All,
I'm wanting to do some range queries using latitude and longitude. I have numbers like so: long lat -84.65532 32.74212 What would be the best way to store this in lucene so I can do a range query? Also for all you smart people out there do you know the distance between the decimal places? What I mean is if the long is constant what is the distance (miles, kilometers, feet etc) between 32.74213 - 32.74212 = .00001 = ?distance? 32.74222 - 32.74212 = .00010 = ?distance? Thanks, Andrew --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden email] For additional commands, e-mail: [hidden email] |
On May 8, 2005, at 11:26 AM, Andrew Boyd wrote: > Hi All, > I'm wanting to do some range queries using latitude and longitude. > > I have numbers like so: > > long lat > -84.65532 32.74212 > > What would be the best way to store this in lucene so I can do a > range query? > > Also for all you smart people out there do you know the distance > between the decimal places? > What I mean is if the long is constant what is the distance (miles, > kilometers, feet etc) between > > 32.74213 - 32.74212 = .00001 = ?distance? > 32.74222 - 32.74212 = .00010 = ?distance? > > Thanks, > > Andrew > If longitude is held constant, then each degree of latitude is 111.3171 kilometers. The distance between degrees of longitude is more complicated and depends upon what latitude you are at. There are a lot of sites on the web that will do the calculations for you. This one: <http://jan.ucc.nau.edu/~cvm/latlongdist.html> will accept a format of either decimal degrees or degrees, minutes, seconds. It is easy to convert between the two knowing that there are 60 minutes in a degree and 60 seconds in a minute. The above URL also gives the equations for calculating distance assuming you want to write some code to do this. -- Bill Tschumy Otherwise -- Austin, TX http://www.otherwise.com --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden email] For additional commands, e-mail: [hidden email] |
In reply to this post by Andrew Boyd
Hello Andrew,
There already is a plugin available for Nutch : http://wiki.apache.org/nutch/GeoPosition I think that one can easily integrate it into a lucene app (i'll make some experimentations with it soon) ---- Sven Le dimanche 8 mai 2005 ? 18:26:14, vous ?criviez : AB> Hi All, AB> I'm wanting to do some range queries using latitude and longitude. AB> I have numbers like so: AB> long lat AB> -84.65532 32.74212 AB> What would be the best way to store this in lucene so I can do a range query? AB> Also for all you smart people out there do you know the AB> distance between the decimal places? AB> What I mean is if the long is constant what is the distance AB> (miles, kilometers, feet etc) between AB> 32.74213 - 32.74212 = .00001 = ?distance? AB> 32.74222 - 32.74212 = .00010 = ?distance? AB> Thanks, AB> Andrew AB> --------------------------------------------------------------------- AB> To unsubscribe, e-mail: [hidden email] AB> For additional commands, e-mail: [hidden email] --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden email] For additional commands, e-mail: [hidden email] |
In reply to this post by Andrew Boyd
Thanks for the pointers
I'm going to store the long as E086.656530 or W086.656530 and the lat as N34.74212 or S34.74212 that should at least keep the lexographic search happy. I'm still reading the math pointer. thanks! Andrew -----Original Message----- From: Sven Duzont <[hidden email]> Sent: May 8, 2005 1:29 PM To: Andrew Boyd <[hidden email]> Subject: Re: Latitude/Longitude and Lexigraphical search Hello Andrew, There already is a plugin available for Nutch : http://wiki.apache.org/nutch/GeoPosition I think that one can easily integrate it into a lucene app (i'll make some experimentations with it soon) ---- Sven Le dimanche 8 mai 2005 ï¿½ 18:26:14, vous ï¿½criviez : AB> Hi All, AB> I'm wanting to do some range queries using latitude and longitude. AB> I have numbers like so: AB> long lat AB> -84.65532 32.74212 AB> What would be the best way to store this in lucene so I can do a range query? AB> Also for all you smart people out there do you know the AB> distance between the decimal places? AB> What I mean is if the long is constant what is the distance AB> (miles, kilometers, feet etc) between AB> 32.74213 - 32.74212 = .00001 = ?distance? AB> 32.74222 - 32.74212 = .00010 = ?distance? AB> Thanks, AB> Andrew AB> --------------------------------------------------------------------- AB> To unsubscribe, e-mail: [hidden email] AB> For additional commands, e-mail: [hidden email] --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden email] For additional commands, e-mail: [hidden email] --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden email] For additional commands, e-mail: [hidden email] |
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