Package elki.index.projected

Class LngLatAsECEFIndex<O extends elki.data.NumberVector>

java.lang.Object

elki.index.projected.ProjectedIndex<O,O>

elki.index.projected.LngLatAsECEFIndex<O>

Type Parameters:

O - Object type

All Implemented Interfaces:

elki.index.Index, elki.index.KNNIndex<O>, elki.index.RangeIndex<O>, elki.index.RKNNIndex<O>

public class LngLatAsECEFIndex<O extends elki.data.NumberVector>
extends elki.index.projected.ProjectedIndex<O,O>

Index a 2d data set (consisting of Lng/Lat pairs) by using a projection to 3D coordinates (WGS-86 to ECEF).

Earth-Centered, Earth-Fixed (ECEF) is a 3D coordinate system, sometimes also referred to as XYZ, that uses 3 cartesian axes. The center is at the earths center of mass, the z axis points to the north pole. X axis is to the prime meridan at the equator (so latitude 0, longitude 0), and the Y axis is orthogonal going to the east (latitude 0, longitude 90°E).

The Euclidean distance in this coordinate system is a lower bound for the great-circle distance, and Euclidean coordinates are supposedly easier to index.

Note: this index will only support the distance function LngLatDistance, as it uses a projection that will map data according to this great circle distance. If the query hint "exact" is set, it will not be used.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LngLatAsECEFIndex.Factory<O extends elki.data.NumberVector>	Index factory.

Nested classes/interfaces inherited from class elki.index.projected.ProjectedIndex

elki.index.projected.ProjectedIndex.ProjectedKNNByDBID, elki.index.projected.ProjectedIndex.ProjectedKNNByObject, elki.index.projected.ProjectedIndex.ProjectedRangeByDBID, elki.index.projected.ProjectedIndex.ProjectedRangeByObject, elki.index.projected.ProjectedIndex.ProjectedRKNNByDBID, elki.index.projected.ProjectedIndex.ProjectedRKNNByObject

Field Summary

Fields inherited from class elki.index.projected.ProjectedIndex

inner, kmulti, norefine, proj, refinements, relation, view

Constructor Summary

Constructors

Constructor	Description
LngLatAsECEFIndex(elki.database.relation.Relation<? extends O> relation, elki.data.projection.Projection<O,O> proj, elki.database.relation.Relation<O> view, elki.index.Index inner, boolean norefine)	Constructor.

Method Summary

Modifier and Type	Method	Description
elki.database.query.knn.KNNSearcher<O>	kNNByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery, int maxk, int flags)
elki.database.query.range.RangeSearcher<O>	rangeByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery, double maxradius, int flags)
elki.database.query.rknn.RKNNSearcher<O>	rkNNByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery, int maxk, int flags)

Methods inherited from class elki.index.projected.ProjectedIndex

initialize, kNNByDBID, logStatistics, rangeByDBID, rkNNByDBID

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LngLatAsECEFIndex

public LngLatAsECEFIndex(elki.database.relation.Relation<? extends O> relation,
                         elki.data.projection.Projection<O,O> proj,
                         elki.database.relation.Relation<O> view,
                         elki.index.Index inner,
                         boolean norefine)

Constructor.

Parameters:

relation - Relation to index.

proj - Projection to use.

view - View to use.

inner - Index to wrap.

norefine - Refinement disable flag.

Method Detail

kNNByObject

public elki.database.query.knn.KNNSearcher<O> kNNByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery,
                                                          int maxk,
                                                          int flags)

Specified by:

kNNByObject in interface elki.index.KNNIndex<O extends elki.data.NumberVector>

Overrides:

kNNByObject in class elki.index.projected.ProjectedIndex<O extends elki.data.NumberVector,O extends elki.data.NumberVector>

rangeByObject

public elki.database.query.range.RangeSearcher<O> rangeByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery,
                                                                double maxradius,
                                                                int flags)

Specified by:

rangeByObject in interface elki.index.RangeIndex<O extends elki.data.NumberVector>

Overrides:

rangeByObject in class elki.index.projected.ProjectedIndex<O extends elki.data.NumberVector,O extends elki.data.NumberVector>

rkNNByObject

public elki.database.query.rknn.RKNNSearcher<O> rkNNByObject(elki.database.query.distance.DistanceQuery<O> distanceQuery,
                                                             int maxk,
                                                             int flags)

Specified by:

rkNNByObject in interface elki.index.RKNNIndex<O extends elki.data.NumberVector>

Overrides:

rkNNByObject in class elki.index.projected.ProjectedIndex<O extends elki.data.NumberVector,O extends elki.data.NumberVector>