Package org.osgi.util.position

Class Position

java.lang.Object

org.osgi.util.position.Position

public class Position
extends java.lang.Object

Position represents a geographic location, based on the WGS84 System (World Geodetic System 1984).

The org.osgi.util.measurement.Measurement class is used to represent the values that make up a position.

A given position object may lack any of it's components, i.e. the altitude may not be known. Such missing values will be represented by null.

Position does not override the implementation of either equals() or hashCode() because it is not clear how missing values should be handled. It is up to the user of a position to determine how best to compare two position objects. A Position object is immutable.

Constructor Summary

Constructors

Constructor	Description
Position(Measurement lat, Measurement lon, Measurement alt, Measurement speed, Measurement track)	Constructs a Position object with the given values.

Method Summary

Modifier and Type	Method	Description
Measurement	getAltitude()	Returns the altitude of this position in meters.
Measurement	getLatitude()	Returns the latitude of this position in radians.
Measurement	getLongitude()	Returns the longitude of this position in radians.
Measurement	getSpeed()	Returns the ground speed of this position in meters per second.
Measurement	getTrack()	Returns the track of this position in radians as a compass heading.

Methods inherited from class java.lang.Object

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

Constructor Detail

Position

public Position(Measurement lat,
                Measurement lon,
                Measurement alt,
                Measurement speed,
                Measurement track)

Constructs a Position object with the given values.

Parameters:

lat - a Measurement object specifying the latitude in radians, or null

lon - a Measurement object specifying the longitude in radians, or null

alt - a Measurement object specifying the altitude in meters, or null

speed - a Measurement object specifying the speed in meters per second, or null

track - a Measurement object specifying the track in radians, or null

Method Detail

getAltitude

public Measurement getAltitude()

Returns the altitude of this position in meters.

Returns:

a Measurement object in Unit.m representing the altitude in meters above the ellipsoid null if the altitude is not known.

getLongitude

public Measurement getLongitude()

Returns the longitude of this position in radians.

Returns:

a Measurement object in Unit.rad representing the longitude, or null if the longitude is not known.

getLatitude

public Measurement getLatitude()

Returns the latitude of this position in radians.

Returns:

a Measurement object in Unit.rad representing the latitude, or null if the latitude is not known..

getSpeed

public Measurement getSpeed()

Returns the ground speed of this position in meters per second.

Returns:

a Measurement object in Unit.m_s representing the speed, or null if the speed is not known..

getTrack

public Measurement getTrack()

Returns the track of this position in radians as a compass heading. The track is the extrapolation of previous previously measured positions to a future position.

Returns:

a Measurement object in Unit.rad representing the track, or null if the track is not known..