Namespace Lucene.Net.Spatial.Vector

Classes

DistanceValueSource

An implementation of the Lucene ValueSource model that returns the distance for a PointVectorStrategy.

@lucene.internal

PointVectorStrategy

Simple SpatialStrategy which represents Points in two numeric DoubleFields. The Strategy's best feature is decent distance sort.

Characteristics:

Only indexes points; just one per field value.
Can query by a rectangle or circle.
Intersects and IsWithin is supported.
Uses the FieldCache for MakeDistanceValueSource(IPoint) and for searching with a Circle.

Implementation:

This is a simple Strategy. Search works with NumericRangeQuerys on an x & y pair of fields. A Circle query does the same bbox query but adds a ValueSource filter on MakeDistanceValueSource(IPoint).

One performance shortcoming with this strategy is that a scenario involving both a search using a Circle and sort will result in calculations for the spatial distance being done twice -- once for the filter and second for the sort.