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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-2125) Spatial filter is not accurate
Date Mon, 20 Sep 2010 23:49:34 GMT
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 (≈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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