Geolocation

Links

• Installation and Configuration of LocalSolr

• LocalSolr offers geographical searching capabilities to your search engine.

• http://code.google.com/p/forage/wiki/GeoSearch forage - Search Abstraction Layer

• Geo Location Search with Solr and Lucene

• developerWorks, Location-aware search with Apache Lucene and Solr.

LocalSolr

Install

• Follow the normal Install instructions.

• Download locallucene_r2.0.tar.gz and localsolr_r2.0.tar.gz from http://sourceforge.net/projects/locallucene/

• Extract the following jar files from the archives and add to the lib folder in your solr/home (e.g. in the Install, the lib folder would be /home/repository/solr/default/lib/):

  • geoapi-nogenerics-2.1-M2.jar

  • gt2-referencing-2.3.1.jar

  • jsr108-0.01.jar

  • junit.jar

  • locallucene.jar

  • localsolr.jar

• Update solrconfig.xml. Here is a patch file showing the configuration to insert: solrconfig.xml.patch

• Add the following field definitions to your schema.xml file:

  <field name="lat" type="sdouble" indexed="true" stored="true"/><!-- must match the latField in solrconfig.xml -->
  <field name="lng" type="sdouble" indexed="true" stored="true"/><!-- must match the lngField in solrconfig.xml -->
  <field name="geo_distance" type="sdouble"/> <!-- Optional but used for distributed searching -->
  <dynamicField name="_local*" type="sdouble" indexed="true" stored="true"/><!-- used internally by localsolr -->
  

• If you want to use the demo data (or the LocalSolr demo data)…

  • Add the following field definitions to your schema.xml file:

    <field name="cinema" type="text" indexed="true" stored="true"/>
    <field name="street" type="text" indexed="true" stored="true" omitNorms="true"/>
    <field name="city" type="text_ws" indexed="true" stored="true" multiValued="true" omitNorms="true"/>
    <field name="zip" type="text" indexed="true" stored="true"/>
    <field name="doctype" type="text" indexed="true" stored="true"/>
    

  • Extract post.jar from the apache-solr-1.3.0.zip archive, folder apache-solr-1.3.0/example/exampledocs/.

  • Get a copy of the XML demo data: devon.xml

  • Start SOLR and add the data to SOLR:

    java -Durl=http://localhost:8080/solr/update -jar post.jar devon.xml
    

  • Here is a python script which you can use to test the search: search-http-get.py.

  • To install the LocalSolr demo data, download http://www.nsshutdown.com/solr-example.tgz

  • Extract ny_cinemas.xml from the archive folder, solr-example.tar/solr-example/data/ny_cinemas.xml.

  • Start SOLR and add the data to SOLR:

    java -Durl=http://localhost:8080/solr/update -jar post.jar ny_cinemas.xml
    

Sort

To sort by distance simply add:

&sort=geo_distance asc

For sample code see search.py