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From "Mark Rodseth (Created) (JIRA)" <j...@apache.org>
Subject [Lucene.Net] [jira] [Created] (LUCENENET-462) Spatial Search skipping records with small radius e.g. 1 mile
Date Wed, 04 Jan 2012 09:55:38 GMT
Spatial Search skipping records with small radius e.g. 1 mile
-------------------------------------------------------------

                 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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