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From "Harley Parks (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2155) Geospatial search using geohash prefixes
Date Thu, 15 Mar 2012 06:02:15 GMT


Harley Parks commented on SOLR-2155:

Sorry, about the editing.

But Thanks For the Feedback.

so perhaps there is something wrong with my configuration, since the search results do not
return lat, long but the geohash string.
The maven build went great. 

I did finally figure out how to use the geofilt function using the pt and d.

I am reindexing each time, but yes, I delete the data folder, and reindex.

I am placing the jar file into the tomcats solr/lib folder, after a restart, and after changing
solrconfig and schema, geohash string is displayed, not the lat,long.
Field Type:
<fieldType name="geohash" class="solr2155.solr.schema.GeoHashField" length="12"/>
this is the field:
   <field name="GeoTagGeoHash" type="geohash" indexed="true" stored="true" multiValued="true"

this is the info from solr/admin/ field types - GEOHASH
Field Type: geohash
Tokenized: true
Class Name: solr2155.solr.schema.GeoHashField
Index Analyzer: org.apache.solr.analysis.TokenizerChain
Tokenizer Class: solr2155.solr.schema.GeoHashField$1
Query Analyzer: org.apache.solr.schema.FieldType$DefaultAnalyzer

Still, the query returns values like:

<arr name="GeoTagGeoHash">

so, if this is not the right, is there anything I can do to troubleshoot?
> Geospatial search using geohash prefixes
> ----------------------------------------
>                 Key: SOLR-2155
>                 URL:
>             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-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 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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