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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (SOLR-2125) Spatial filter is not accurate
Date Tue, 21 Sep 2010 09:01:32 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912883#action_12912883
] 

Bill Bell edited comment on SOLR-2125 at 9/21/10 5:01 AM:
----------------------------------------------------------

/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/DistanceUtils.java - hsin appears
to be okay.

Good print:

System.out.println("x1 = " + x1 + " - " + x1*180/Math.PI + ",y1 = " + y1 + " - " + x2*180/Math.PI
+ ",x2 = " + x2 + " - " + x2*180/Math.PI + ",y2 = " + y2 + " - " + y2*180/Math.PI + ",radius
= " + radius + "\n");
 System.out.println("result = " + result + " km\n");

My guess: "src/java/org/apache/solr/schema/LatLonType.java


{code}
    double[] ur;
    double[] ll;
    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);
    } else {
      ur = DistanceUtils.vectorBoxCorner(point, null, options.distance, true);
      ll = DistanceUtils.vectorBoxCorner(point, null, options.distance, false);
    }

{code}




      was (Author: billnbell):
    /lucene/contrib/spatial/src/java/org/apache/lucene/spatial/DistanceUtils.java - hsin appears
to be okay.

Good print:

System.out.println("x1 = " + x1 + " - " + x1*180/Math.PI + ",y1 = " + y1 + " - " + x2*180/Math.PI
+ ",x2 = " + x2 + " - " + x2*180/Math.PI + ",y2 = " + y2 + " - " + y2*180/Math.PI + ",radius
= " + radius + "\n");
 System.out.println("result = " + result + " km\n");

Where is the boundary calculated?


  
> 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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