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https://issues.apache.org/jira/browse/SOLR-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114703#comment-13114703
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David Smiley commented on SOLR-2155:
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bq. You mention: "Sorting by (multi-value) indexed shapes is supported only for
points". Does this mean that representation 1.) above is supported? It wasn't
entirely clear for me from your response.
Yes, it does. This patch & LSP support sorting documents by a multi-value
point field.
Based on the description of your use-case and my interpretation of what you say
(which I am not 100% sure of), I don't think it's pertinent that the "walks"
are polygons. What is pertinent is that they are a collection of points (Pois).
So if your "walk" corresponds to a Solr document, you could have a "poi" field
that is an indexed multi-value geospatial point field. Then you could sort
walks (documents) according to the pois that are closest to a user-specified
point in the query. I would add a large bounding-box filter which would
improve performance. It's not clear to me there is any need for polygon
support.
FYI I use the well-known JTS library for polygon support.
> 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: Grant Ingersoll
> Attachments: GeoHashPrefixFilter.patch, GeoHashPrefixFilter.patch,
> GeoHashPrefixFilter.patch,
> SOLR-2155_GeoHashPrefixFilter_with_sorting_no_poly.patch, SOLR.2155.p3.patch,
> SOLR.2155.p3tests.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
> 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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