Spatial filter is not accurate
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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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