com.spatial4j.core.distance

Class GeodesicSphereDistCalc

java.lang.Object

com.spatial4j.core.distance.AbstractDistanceCalculator

com.spatial4j.core.distance.GeodesicSphereDistCalc

All Implemented Interfaces:

DistanceCalculator

Direct Known Subclasses:

GeodesicSphereDistCalc.Haversine, GeodesicSphereDistCalc.LawOfCosines, GeodesicSphereDistCalc.Vincenty

public abstract class GeodesicSphereDistCalc
extends AbstractDistanceCalculator

A base class for a Distance Calculator that assumes a spherical earth model.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GeodesicSphereDistCalc.Haversine
static class	GeodesicSphereDistCalc.LawOfCosines
static class	GeodesicSphereDistCalc.Vincenty

Constructor Summary

Constructors

Constructor and Description
GeodesicSphereDistCalc()

Method Summary

Methods

Modifier and Type	Method and Description
double	area(Circle circle)
double	area(Rectangle rect)
double	calcBoxByDistFromPt_yHorizAxisDEG(Point from, double distDEG, SpatialContext ctx) The Y coordinate of the horizontal axis of a circle that has maximum width.
Rectangle	calcBoxByDistFromPt(Point from, double distDEG, SpatialContext ctx, Rectangle reuse) Calculates the bounding box of a circle, as specified by its center point and distance.
double	distance(Point from, double toX, double toY) The distance between from and Point(toX,toY).
protected abstract double	distanceLatLonRAD(double lat1, double lon1, double lat2, double lon2)
boolean	equals(Object obj)
int	hashCode()
Point	pointOnBearing(Point from, double distDEG, double bearingDEG, SpatialContext ctx, Point reuse) Calculates where a destination point is given an origin (from) distance, and bearing (given in degrees -- 0-360).

Methods inherited from class com.spatial4j.core.distance.AbstractDistanceCalculator

distance, toString, within

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

GeodesicSphereDistCalc

public GeodesicSphereDistCalc()

Method Detail

pointOnBearing

public Point pointOnBearing(Point from,
                   double distDEG,
                   double bearingDEG,
                   SpatialContext ctx,
                   Point reuse)

Description copied from interface: DistanceCalculator

Calculates where a destination point is given an origin (from) distance, and bearing (given in degrees -- 0-360). If reuse is given, then this method may reset() it and return it.

calcBoxByDistFromPt

public Rectangle calcBoxByDistFromPt(Point from,
                            double distDEG,
                            SpatialContext ctx,
                            Rectangle reuse)

Description copied from interface: DistanceCalculator

Calculates the bounding box of a circle, as specified by its center point and distance.

calcBoxByDistFromPt_yHorizAxisDEG

public double calcBoxByDistFromPt_yHorizAxisDEG(Point from,
                                       double distDEG,
                                       SpatialContext ctx)

Description copied from interface: DistanceCalculator

The Y coordinate of the horizontal axis of a circle that has maximum width. On a 2D plane, this result is always from.getY() but, perhaps surprisingly, on a sphere it is going to be slightly different.

area

public double area(Rectangle rect)

area

public double area(Circle circle)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

distance

public final double distance(Point from,
              double toX,
              double toY)

Description copied from interface: DistanceCalculator

The distance between from and Point(toX,toY).

distanceLatLonRAD

protected abstract double distanceLatLonRAD(double lat1,
                       double lon1,
                       double lat2,
                       double lon2)