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https://issues.apache.org/jira/browse/SOLR-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912780#action_12912780
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Bill Bell commented on SOLR-1568:
---------------------------------
The calculations of distance appears to be off.
Note: "The radius of the sphere to be used when calculating distances on a
sphere (i.e. haversine). Default is the Earth's mean radius in kilometers (see
org.apache.solr.search.function.distance.Constants.EARTH_MEAN_RADIUS_KM) which
is set to 3,958.761458084784856. Most applications will not need to set this."
The radius of the earth in KM is 6371.009 km (≈3958.761 mi).
Also filtering distance appears to be off - example data:
45.17614,-93.87341 to 44.9369054,-91.3929348 Approx 137 miles Google. 169 miles
= 220 kilometers
http://....../solr/select?fl=*,score&start=0&rows=10&q={!sfilt%20fl=store_lat_lon}&qt=standard&pt=44.9369054,-91.3929348&d=280&sort=dist(2,store,vector(44.9369054,-91.3929348))
asc
Nothing shows. d=285 shows results. This is off by a lot.
Bill
> Implement Spatial Filter
> ------------------------
>
> Key: SOLR-1568
> URL: https://issues.apache.org/jira/browse/SOLR-1568
> Project: Solr
> Issue Type: New Feature
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 3.1, 4.0
>
> Attachments: CartesianTierQParserPlugin.java,
> SOLR-1568.Mattmann.031010.patch.txt, SOLR-1568.patch, SOLR-1568.patch,
> SOLR-1568.patch, SOLR-1568.patch, SOLR-1568.patch, SOLR-1568.patch,
> SOLR-1568.patch, SOLR-1568.patch, SOLR-1568.patch, SOLR-1568.patch,
> SOLR-1568.patch, SOLR-1568.patch
>
>
> Given an index with spatial information (either as a geohash,
> SpatialTileField (see SOLR-1586) or just two lat/lon pairs), we should be
> able to pass in a filter query that takes in the field name, lat, lon and
> distance and produces an appropriate Filter (i.e. one that is aware of the
> underlying field type for use by Solr.
> The interface _could_ look like:
> {code}
> &fq={!sfilt dist=20}location:49.32,-79.0
> {code}
> or it could be:
> {code}
> &fq={!sfilt lat=49.32 lat=-79.0 f=location dist=20}
> {code}
> or:
> {code}
> &fq={!sfilt p=49.32,-79.0 f=location dist=20}
> {code}
> or:
> {code}
> &fq={!sfilt lat=49.32,-79.0 fl=lat,lon dist=20}
> {code}
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