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https://issues.apache.org/jira/browse/SOLR-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913572#action_12913572
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Bill Bell commented on SOLR-2125:
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Another reference:
I like the pointInPolygon() idea from Microsoft. I do not like that they don't
have a short-cut to reduce the shapes like what we have implemented. But their
looping to make sure the distance is being satisfied is good.... See below.
http://msdn.microsoft.com/en-us/library/cc451895.aspx
As follow-up, I would take my patch apply it, and then loop through the results
to limit by hsin() distance to make sure the results are not on the 45
degree.... I also would make this 2nd step optional, since it slows things
down, and for most applications they don't need to be that precise. (SInce you
order by hsin() desc - the large distances if there are any will be at the
bottom and inconsequential).
> Spatial filter is not accurate
> ------------------------------
>
> Key: SOLR-2125
> URL: https://issues.apache.org/jira/browse/SOLR-2125
> Project: Solr
> Issue Type: Bug
> Components: Build
> Affects Versions: 1.5
> Reporter: Bill Bell
> Assignee: Grant Ingersoll
> Attachments: Distance.diff, SOLR-2125.patch, solrspatial.xlsx
>
>
> 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
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