lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Harley Parks (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (SOLR-2155) Geospatial search using geohash prefixes
Date Tue, 13 Mar 2012 05:17:48 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228218#comment-13228218
] 

Harley Parks edited comment on SOLR-2155 at 3/13/12 5:17 AM:
-------------------------------------------------------------

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 to 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?
                
      was (Author: powersparks):
    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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message