org.esa.snap.core.util.math

Class CosineDistance

java.lang.Object

org.esa.snap.core.util.math.CosineDistance

All Implemented Interfaces:

DistanceMeasure

public final class CosineDistance
extends Object
implements DistanceMeasure

This class uses the negative cosine of the spherical distance as a distance measure between two (lon, lat) points.

This distance measure is computationally much less expensive than the spherical distance, because it is not necessary to evaluate the inverse of the cosine.

Constructor Summary

Constructors

Constructor and Description
CosineDistance(double lon, double lat) Creates a new instance of this class.

Method Summary

Modifier and Type	Method and Description
double	distance(double lon, double lat) Returns the distance of a given (lon, lat) point to the reference (lon, lat) point.

Methods inherited from class java.lang.Object

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

Constructor Detail

CosineDistance

public CosineDistance(double lon,
                      double lat)

Creates a new instance of this class.

Parameters:

lon - The reference longitude of this distance calculator.

lat - The reference latitude of this distance calculator.

Method Detail

distance

public double distance(double lon,
                       double lat)

Returns the distance of a given (lon, lat) point to the reference (lon, lat) point.

Specified by:

distance in interface DistanceMeasure

Parameters:

lon - The longitude.

lat - The latitude.

Returns:

the distance of the given (lon, lat) point to the reference (lon, lat) point.