Lucene.Net  3.0.3
Lucene.Net is a .NET port of the Java Lucene Indexing Library
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AreaSimilarity.cs File Reference

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Classes

class  Lucene.Net.Spatial.BBox.AreaSimilarity
 The algorithm is implemented as envelope on envelope overlays rather than complex polygon on complex polygon overlays. Spatial relevance scoring algorithm:
queryArea = the area of the input query envelope
targetArea = the area of the target envelope (per Lucene document)
intersectionArea = the area of the intersection for the query/target envelopes
queryPower = the weighting power associated with the query envelope (default = 1.0)
targetPower = the weighting power associated with the target envelope (default = 1.0)
queryRatio = intersectionArea / queryArea;
targetRatio = intersectionArea / targetArea;
queryFactor = Math.pow(queryRatio,queryPower);
targetFactor = Math.pow(targetRatio,targetPower);
score = queryFactor /// targetFactor; Based on Geoportal's SpatialRankingValueSource. More...
 

Namespaces

package  Lucene.Net.Spatial.BBox