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From Peter Wolanin <peter.wola...@acquia.com>
Subject Re: what data type for geo fields?
Date Thu, 28 Jul 2011 14:24:39 GMT
Thanks for the feedback.  I'll have look more at how geohash works.

Looking at the sample schema more closely, I see:

 <fieldType name="double" class="solr.TrieDoubleField"
precisionStep="0" omitNorms="true" positionIncrementGap="0"/>

So in fact "double" is also Trie, but just with precisionStep 0 in the example.

-Peter

On Wed, Jul 27, 2011 at 9:57 AM, Yonik Seeley
<yonik@lucidimagination.com> wrote:
> On Wed, Jul 27, 2011 at 9:01 AM, Peter Wolanin <peter.wolanin@acquia.com> wrote:
>> Looking at the example schema:
>>
>> http://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_3_3/solr/example/solr/conf/schema.xml
>>
>> the solr.PointType field type uses double (is this just an example
>> field, or used for geo search?)
>
> While you could possibly use PointType for geo search, it doesn't have
> good support for it (it's more of a general n-dimension point)
> The LatLonType has all the geo support currently.
>
>>, while the solr.LatLonType field uses
>> tdouble and it's unclear how the geohash is translated into lat/lon
>> values or if the geohash itself might typically be used as a copyfield
>> and use just for matching a query on a geohash?
>
> There's no geohash used in LatLonType
> It is indexed as a lat and lon under the covers (using the suffix "_d")
>
>> Is there an advantage in terms of speed to using Trie fields for
>> solr.LatLonType?
>
> Currently only for explicit range queries... like point:[10,10 TO 20,20]
>
>>  I would assume so, e.g. for bbox operations.
>
> It's a bit of an implementation detail, but bbox doesn't currently use
> range queries.
>
> -Yonik
> http://www.lucidimagination.com
>



-- 
Peter M. Wolanin, Ph.D.      : Momentum Specialist,  Acquia. Inc.
peter.wolanin@acquia.com : 978-296-5247

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