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https://issues.apache.org/jira/browse/SOLR-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477653#comment-13477653
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Robert Tseng commented on SOLR-2155:
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Hi All,
New to Solr here! I have a question for you all on gh_geofilt. My document
has rows of path, think of KML lineString, of which I want to do bounding box
check which of them fall within a box. Each row basically has an id field and
a multivalued field describing the line with multiple points.
What I want returned is all lines that fall within but I read Solr is not very
good, yet, in returning large number of hits. Hence the row params to limit
result to top N rows. My two questions are:
1. If want to retrieve all rows, do I query twice from solrj. Once to get
number of hits so I can set the number of rows that grabs all row in a second
call? Or two I should chunk up the query call using the start params as an
offset?
2. If it's only returning top N, is it based on score? What is considered high
score? A row with most number of hits in the box? Cloest to the center?
> 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
> Assignee: David Smiley
> Attachments: GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch,
> GeoHashPrefixFilter.patch, Solr2155-1.0.2-project.zip,
> Solr2155-1.0.3-project.zip, Solr2155-1.0.4-project.zip,
> Solr2155-for-1.0.2-3.x-port.patch,
> SOLR-2155_GeoHashPrefixFilter_with_sorting_no_poly.patch, SOLR.2155.p3.patch,
> SOLR.2155.p3tests.patch
>
>
> {panel:title=NOTICE} The status of this issue is a plugin for Solr 3.x
> located here: https://github.com/dsmiley/SOLR-2155. Look at the introductory
> readme and download the plugin .jar file. Lucene 4's new spatial module is
> largely based on this code. The Solr 4 glue for it should come very soon but
> as of this writing it's hosted temporarily at https://github.com/spatial4j.
> For more information on using SOLR-2155 with Solr 3, see
> http://wiki.apache.org/solr/SpatialSearch#SOLR-2155 This JIRA issue is
> closed because it won't be committed in its current form.
> {panel}
> 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.
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