Spatial Search skipping records with small radius e.g. 1 mile
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                 Key: LUCENENET-462
                 URL: https://issues.apache.org/jira/browse/LUCENENET-462
             Project: Lucene.Net
          Issue Type: Bug
          Components: Lucene.Net Contrib
    Affects Versions: Lucene.Net 2.9.4
         Environment: .Net framework 4.0
            Reporter: Mark Rodseth


Running a spatial query against a list of locations all within 1 mile of a 
location returns correct results for 2 miles, but incorrect results for 1 mile. 
For the one mile query, only 2 of the 8 rows are returned. 

Locations & Test below:

// Origin
private double _lat = 51.508129;
private double _lng = -0.128005;
private const string LatField = "lat";
private const string LngField = "lng";

// Locations
AddPoint(writer, "Location 1", 51.5073802128877, -0.124669075012207);
AddPoint(writer, "Location 2", 51.5091, -0.1235);
AddPoint(writer, "Location 3", 51.5093, -0.1232);
AddPoint(writer, "Location 4", 51.5112531582845, -0.12509822845459);
AddPoint(writer, "Location 5", 51.5107, -0.123);
AddPoint(writer, "Location 6", 51.512, -0.1246);
AddPoint(writer, "Location 8", 51.5088760101322, -0.143165588378906);
AddPoint(writer, "Location 9", 51.5087958793819, -0.143508911132813);


                [Test]
                public void TestAntiM()
                {
                        _searcher = new IndexSearcher(_directory, true);

                        const double miles = 1.0; // Bug? Only returns 2 
locations. Should return 8. 
                        // const double miles = 2.0; // Correct. Returns 8 
Locations.

                        Console.WriteLine("testAntiM");
                        // create a distance query
                        var dq = new DistanceQueryBuilder(_lat, _lng, miles, 
LatField, LngField, CartesianTierPlotter.DefaltFieldPrefix, true);

                        Console.WriteLine(dq);
                        //create a term query to search against all documents
                        Query tq = new TermQuery(new Term("metafile", "doc"));

                        var dsort = new 
DistanceFieldComparatorSource(dq.DistanceFilter);
                        Sort sort = new Sort(new SortField("foo", dsort, 
false));

                        // Perform the search, using the term query, the 
distance filter, and the
                        // distance sort
                        TopDocs hits = _searcher.Search(tq, dq.Filter, 1000, 
sort);
                        int results = hits.totalHits;
                        ScoreDoc[] scoreDocs = hits.scoreDocs;

                        // Get a list of distances
                        Dictionary<int, Double> distances = 
dq.DistanceFilter.Distances;

                        
                        Console.WriteLine("Distance Filter filtered: " + 
distances.Count);
                        Console.WriteLine("Results: " + results);
                        Console.WriteLine("=============================");
                        Console.WriteLine("Distances should be 8 " + 
distances.Count);
                        Console.WriteLine("Results should be 8 " + results);

                        Assert.AreEqual(8, distances.Count); // fixed a store 
of only needed distances
                        Assert.AreEqual(8, results);
}




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