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Posted to dev@lucene.apache.org by "Harley Parks (Commented) (JIRA)" <ji...@apache.org> on 2012/03/13 06:17:46 UTC
[jira] [Commented] (SOLR-2155) Geospatial search using geohash
prefixes
[ https://issues.apache.org/jira/browse/SOLR-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228218#comment-13228218 ]
Harley Parks commented on SOLR-2155:
------------------------------------
So, basic question.. perhaps needs to be posted else where.
I'm working with Solr 3.4, using the GeoHash to store multiple locations for a document.
if geofilt or geodist doesn't work with the GeoHash, is the only way to add this patch into solr 3.4?
I'm using a tomcat and solr, and jumping to 4.0 might be a while, even if it's released soon.
I'm not real clear how to apply the patch, as I would need basically create the solr.war file from the source... and compile all of the other sources... painful, but once setup, perhaps rewarding.
Ideally, I would have a jar file from the patch, that I drop into the solr/lib and make the needed changes to the config files.
So, I'm real interested in getting something stable, so i'm watching the above mentioned links.
David Smiley, would you be able to amend your book - Apache Solr 3 ESS, which mentions solr-2155, to include how to implement this patch? or do I need to get brave, and build the source?
> Geospatial search using geohash prefixes
> ----------------------------------------
>
> Key: SOLR-2155
> URL: https://issues.apache.org/jira/browse/SOLR-2155
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Attachments: GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch, SOLR-2155_GeoHashPrefixFilter_with_sorting_no_poly.patch, SOLR.2155.p3.patch, SOLR.2155.p3tests.patch, Solr2155-1.0.2-project.zip, Solr2155-1.0.3-project.zip, Solr2155-for-1.0.2-3.x-port.patch
>
>
> There currently isn't a solution in Solr for doing geospatial filtering on documents that have a variable number of points. This scenario occurs when there is location extraction (i.e. via a "gazateer") occurring on free text. None, one, or many geospatial locations might be extracted from any given document and users want to limit their search results to those occurring in a user-specified area.
> I've implemented this by furthering the GeoHash based work in Lucene/Solr with a geohash prefix based filter. A geohash refers to a lat-lon box on the earth. Each successive character added further subdivides the box into a 4x8 (or 8x4 depending on the even/odd length of the geohash) grid. The first step in this scheme is figuring out which geohash grid squares cover the user's search query. I've added various extra methods to GeoHashUtils (and added tests) to assist in this purpose. The next step is an actual Lucene Filter, GeoHashPrefixFilter, that uses these geohash prefixes in TermsEnum.seek() to skip to relevant grid squares in the index. Once a matching geohash grid is found, the points therein are compared against the user's query to see if it matches. I created an abstraction GeoShape extended by subclasses named PointDistance... and CartesianBox.... to support different queried shapes so that the filter need not care about these details.
> This work was presented at LuceneRevolution in Boston on October 8th.
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Re: [jira] [Commented] (SOLR-2155) Geospatial search using geohash prefixes
Posted by Erick Erickson <er...@gmail.com>.
Be brave, just go for building it <G>...
It's actually surprisingly easy.
Start here:
http://wiki.apache.org/solr/HowToContribute
you should be able to get this all running (assuming
you have svn, ant and a jdk) in about 15 minutes,
exclusive of the checkout time. I was amazed first
time I tried it.
One note: Solr 3.x all go against the 1.5 JDK. It should
work against the 1.6, but note that the release was compiled
with 1.5.....
Applying the patches is patching source code and recompiling
Best
Erick
On Tue, Mar 13, 2012 at 12:17 AM, Harley Parks (Commented) (JIRA)
<ji...@apache.org> wrote:
>
> [ https://issues.apache.org/jira/browse/SOLR-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228218#comment-13228218 ]
>
> Harley Parks commented on SOLR-2155:
> ------------------------------------
>
> So, basic question.. perhaps needs to be posted else where.
> I'm working with Solr 3.4, using the GeoHash to store multiple locations for a document.
> if geofilt or geodist doesn't work with the GeoHash, is the only way to add this patch into solr 3.4?
> I'm using a tomcat and solr, and jumping to 4.0 might be a while, even if it's released soon.
>
> I'm not real clear how to apply the patch, as I would need basically create the solr.war file from the source... and compile all of the other sources... painful, but once setup, perhaps rewarding.
>
> Ideally, I would have a jar file from the patch, that I drop into the solr/lib and make the needed changes to the config files.
>
> So, I'm real interested in getting something stable, so i'm watching the above mentioned links.
>
> David Smiley, would you be able to amend your book - Apache Solr 3 ESS, which mentions solr-2155, to include how to implement this patch? or do I need to get brave, and build the source?
>
>> Geospatial search using geohash prefixes
>> ----------------------------------------
>>
>> Key: SOLR-2155
>> URL: https://issues.apache.org/jira/browse/SOLR-2155
>> Project: Solr
>> Issue Type: Improvement
>> Reporter: David Smiley
>> Attachments: GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch, SOLR-2155_GeoHashPrefixFilter_with_sorting_no_poly.patch, SOLR.2155.p3.patch, SOLR.2155.p3tests.patch, Solr2155-1.0.2-project.zip, Solr2155-1.0.3-project.zip, Solr2155-for-1.0.2-3.x-port.patch
>>
>>
>> There currently isn't a solution in Solr for doing geospatial filtering on documents that have a variable number of points. This scenario occurs when there is location extraction (i.e. via a "gazateer") occurring on free text. None, one, or many geospatial locations might be extracted from any given document and users want to limit their search results to those occurring in a user-specified area.
>> I've implemented this by furthering the GeoHash based work in Lucene/Solr with a geohash prefix based filter. A geohash refers to a lat-lon box on the earth. Each successive character added further subdivides the box into a 4x8 (or 8x4 depending on the even/odd length of the geohash) grid. The first step in this scheme is figuring out which geohash grid squares cover the user's search query. I've added various extra methods to GeoHashUtils (and added tests) to assist in this purpose. The next step is an actual Lucene Filter, GeoHashPrefixFilter, that uses these geohash prefixes in TermsEnum.seek() to skip to relevant grid squares in the index. Once a matching geohash grid is found, the points therein are compared against the user's query to see if it matches. I created an abstraction GeoShape extended by subclasses named PointDistance... and CartesianBox.... to support different queried shapes so that the filter need not care about these details.
>> This work was presented at LuceneRevolution in Boston on October 8th.
>
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