[LUCENENET-462] Spatial Search skipping records with small radius e.g. 1 mile

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Lucene.Net 2.9.4
• Component/s: Lucene.Net Contrib
• Labels: lucene spatialsearch

Environment

.Net framework 4.0

• Assignee: Itamar Syn-Hershko
• Reporter: Mark Rodseth
• Created: 04/Jan/12 09:54
• Updated: 30/May/12 15:45
• Resolved: 30/May/12 15:45

Description

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);
}