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https://issues.apache.org/jira/browse/SOLR-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912993#action_12912993
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Grant Ingersoll commented on SOLR-2125:
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{code}
if (options.measStr == null || options.measStr.equals("hsin")) {
ur = DistanceUtils.latLonCornerDegs(point[LAT], point[LONG],
options.distance, null, true, options.radius);
ll = DistanceUtils.latLonCornerDegs(point[LAT], point[LONG],
options.distance, null, false, options.radius);
}
{code}
It could very well be in the determination of the two corners. That being
said, in the test I just posted, the point 18.71111, 19.79750 is 3000KM away
from 0,0 according to movable-type when traveling along a 45 degree bearing and
the tests
{code}
checkHits(fieldName, "0,0", 3000, 2, 14, 15);
checkHits(fieldName, "0,0", 3001, 3, 14, 15, 16);
checkHits(fieldName, "0,0", 3000.1, 3, 14, 15, 16);
{code}
Pass for me now that Yonik's patch is applied. Please check my logic.
> 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. 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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