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Date: Mon, 20 Sep 2010 20:01:32 -0400 (EDT)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-2125) Spatial filter is not accurate
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    [ https://issues.apache.org/jira/browse/SOLR-2125?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D12912=
785#action_12912785 ]=20

Yonik Seeley commented on SOLR-2125:
------------------------------------

Just in time Bill!
I just started looking at spatial stuff today since I'm planning on putting=
 some of it in my Lucene Revolution presentation.  I've seen some tweets ab=
out people having difficulties, and I've had some problems when I tried stu=
ff myself.

Anyway, I'm going to try and clean up some of this stuff over the next few =
days and make the wiki a bit more user oriented - an extra pair of eyeballs=
 would be welcome!

> 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
>
> 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 (=E2=89=883958.761 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 =3D 220 kilometers
> http://....../solr/select?fl=3D*,score&start=3D0&rows=3D10&q=3D{!sfilt%20=
fl=3Dstore_lat_lon}&qt=3Dstandard&pt=3D44.9369054,-91.3929348&d=3D280&sort=
=3Ddist(2,store,vector(44.9369054,-91.3929348)) asc=20
> Nothing shows. d=3D285 shows results. This is off by a lot.
> Bill

--=20
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