Re: any docs on using the GeoHashField?
When I retrieve the value the lat/lon pair that comes out is not exactly the same as what I indexed, which made be think it was actually stored as the hash and then transformed back? Anyhow - I'm trying to understand the actual use case for the field as it exists - essentially you are saying I could query with a geohash and use data in this field type to do a distance-based filter from the lat,lon point corresponding to the geohash? -Peter On Thu, Sep 8, 2011 at 5:34 PM, Chris Hostetter hossman_luc...@fucit.org wrote: : I would think I could index a lat,lon pair into a GeoHashField (that : works) and then retrieve the field value to see the computed geohash. ... : What am I missing - how can I retrieve the hash? I don't think it's designed to work that way. GeoHashField provides GeoHash based search support for lat/lon values through it's internal (indexed) representaiton -- much like TrieLongField provides efficient range queries using trie encoding -- but the stored value is still the lat/lon pair (just as a TrieLongField is still the long value) If you want to store/retrive a raq GeoHash string, i think you have to compute it yourself (or put the logic in an UpdateProcessor). org.apache.lucene.spatial.geohash.GeoHashUtils should take care of all the heavy lifting for you. -Hoss -- Peter M. Wolanin, Ph.D. : Momentum Specialist, Acquia. Inc. peter.wola...@acquia.com : 781-313-8322 Get a free, hosted Drupal 7 site: http://www.drupalgardens.com;
Re: any docs on using the GeoHashField?
: I would think I could index a lat,lon pair into a GeoHashField (that : works) and then retrieve the field value to see the computed geohash. ... : What am I missing - how can I retrieve the hash? I don't think it's designed to work that way. GeoHashField provides GeoHash based search support for lat/lon values through it's internal (indexed) representaiton -- much like TrieLongField provides efficient range queries using trie encoding -- but the stored value is still the lat/lon pair (just as a TrieLongField is still the long value) If you want to store/retrive a raq GeoHash string, i think you have to compute it yourself (or put the logic in an UpdateProcessor). org.apache.lucene.spatial.geohash.GeoHashUtils should take care of all the heavy lifting for you. -Hoss
any docs on using the GeoHashField?
looking at http://wiki.apache.org/solr/SpatialSearchDev I would think I could index a lat,lon pair into a GeoHashField (that works) and then retrieve the field value to see the computed geohash. however, that doesn't seem to work. If I index: 21.4,33.5 The retrieved value is not a hash, but approximately the same lat,lon: str name=geos_test21.4001527369,33.498472631/str If I try to filter on a geohash, fq=geos_test:sezcd* that works, so I guess the hash is stored internally. What am I missing - how can I retrieve the hash? -Peter -- Peter M. Wolanin, Ph.D. : Momentum Specialist, Acquia. Inc. peter.wola...@acquia.com : 781-313-8322 Get a free, hosted Drupal 7 site: http://www.drupalgardens.com;
