org.oscim.core

Class GeoPoint

java.lang.Object

org.oscim.core.GeoPoint

All Implemented Interfaces:

java.lang.Comparable<GeoPoint>

public class GeoPoint
extends java.lang.Object
implements java.lang.Comparable<GeoPoint>

A GeoPoint represents an immutable pair of latitude and longitude coordinates.

Field Summary

Fields

Modifier and Type	Field and Description
int	latitudeE6 The latitude value of this GeoPoint in microdegrees (degrees * 10^6).
int	longitudeE6 The longitude value of this GeoPoint in microdegrees (degrees * 10^6).

Constructor Summary

Constructors

Constructor and Description
GeoPoint(double lat, double lon)
GeoPoint(int latitudeE6, int longitudeE6)

Method Summary

Modifier and Type	Method and Description
double	bearingTo(GeoPoint other)
int	compareTo(GeoPoint geoPoint)
GeoPoint	destinationPoint(double distance, float bearing) Returns the destination point from this point having travelled the given distance on the given initial bearing (bearing normally varies around path followed).
double	distance(GeoPoint other) Calculate the Euclidean distance from this point to another using the Pythagorean theorem.
boolean	equals(java.lang.Object obj)
double	getLatitude()
double	getLongitude()
int	hashCode()
static double	latitudeDistance(int meters) Calculates the amount of degrees of latitude for a given distance in meters.
static double	longitudeDistance(int meters, double latitude) Calculates the amount of degrees of longitude for a given distance in meters.
void	project(Point out)
double	sphericalDistance(GeoPoint other) Calculate the spherical distance from this point to another using the Haversine formula.
java.lang.String	toString()
double	vincentyDistance(GeoPoint other) Calculate the spherical distance from this point to another using Vincenty inverse formula for ellipsoids.

Methods inherited from class java.lang.Object

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

Field Detail

latitudeE6

public final int latitudeE6

The latitude value of this GeoPoint in microdegrees (degrees * 10^6).

longitudeE6

public final int longitudeE6

The longitude value of this GeoPoint in microdegrees (degrees * 10^6).

Constructor Detail

GeoPoint

public GeoPoint(double lat,
                double lon)

Parameters:

lat - the latitude in degrees, will be limited to the possible latitude range.

lon - the longitude in degrees, will be limited to the possible longitude range.

GeoPoint

public GeoPoint(int latitudeE6,
                int longitudeE6)

Parameters:

latitudeE6 - the latitude in microdegrees (degrees * 10^6), will be limited to the possible latitude range.

longitudeE6 - the longitude in microdegrees (degrees * 10^6), will be limited to the possible longitude range.

Method Detail

bearingTo

public double bearingTo(GeoPoint other)

compareTo

public int compareTo(GeoPoint geoPoint)

Specified by:

compareTo in interface java.lang.Comparable<GeoPoint>

destinationPoint

public GeoPoint destinationPoint(double distance,
                                 float bearing)

Returns the destination point from this point having travelled the given distance on the given initial bearing (bearing normally varies around path followed).

Parameters:

distance - the distance travelled, in same units as earth radius (default: meters)

bearing - the initial bearing in degrees from north

Returns:

the destination point

See Also:

latlon.js

distance

public double distance(GeoPoint other)

Calculate the Euclidean distance from this point to another using the Pythagorean theorem.

Parameters:

other - The point to calculate the distance to

Returns:

the distance in degrees as a double

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

getLatitude

public double getLatitude()

Returns:

the latitude value of this GeoPoint in degrees.

getLongitude

public double getLongitude()

Returns:

the longitude value of this GeoPoint in degrees.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

latitudeDistance

public static double latitudeDistance(int meters)

Calculates the amount of degrees of latitude for a given distance in meters.

Parameters:

meters - distance in meters

Returns:

latitude degrees

longitudeDistance

public static double longitudeDistance(int meters,
                                       double latitude)

Calculates the amount of degrees of longitude for a given distance in meters.

Parameters:

meters - distance in meters

latitude - the latitude at which the calculation should be performed

Returns:

longitude degrees

project

public void project(Point out)

sphericalDistance

public double sphericalDistance(GeoPoint other)

Calculate the spherical distance from this point to another using the Haversine formula.

This calculation is done using the assumption, that the earth is a sphere, it is not though. If you need a higher precision and can afford a longer execution time you might want to use vincentyDistance.

Parameters:

other - The point to calculate the distance to

Returns:

the distance in meters as a double

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

vincentyDistance

public double vincentyDistance(GeoPoint other)

Calculate the spherical distance from this point to another using Vincenty inverse formula for ellipsoids. This is very accurate but consumes more resources and time than the sphericalDistance method.

Adaptation of Chriss Veness' JavaScript Code on http://www.movable-type.co.uk/scripts/latlong-vincenty.html

Paper: Vincenty inverse formula - T Vincenty, "Direct and Inverse Solutions of Geodesics on the Ellipsoid with application of nested equations", Survey Review, vol XXII no 176, 1975 (http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf)

Parameters:

other - The point to calculate the distance to

Returns:

the distance in meters as a double