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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2125) Spatial filter is not accurate
Date Tue, 21 Sep 2010 18:07:34 GMT
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[ https://issues.apache.org/jira/browse/SOLR-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913134#action_12913134
]

Bill Bell commented on SOLR-2125:
---------------------------------

Tow good articles:

http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates
- Pole and good pictures

http://stackoverflow.com/questions/238260/how-to-calculate-the-bounding-box-for-a-given-lat-lng-location
- Why Sphere is only good for 10KM distances.

> 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
>
> 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.
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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