mccombe.mapping

Class Position

java.lang.Object

mccombe.mapping.Position

public class Position
extends java.lang.Object

A Position represents the absolute location of a point in 3D space, independent of any particular Datum, Ellipsoid or type of coordinates. The nature of the internal representation of this point is deliberately encapsulated and irrelevant. This class does not override the toString() method because a Position needs to be part of a CoordinateSystem to have a meaningful String representation.

Instances of this class are immutable.

Constructor Summary

Constructors

Constructor and Description
Position(LatLong geo, double ellipsoidHeight, Ellipsoid sphere, Datum datum) Create a new Position using Lat/Long relative to a specified Ellipsoid and Datum
Position(XYZ point, Datum datum) Creates a new instance of Position based on cartesian coordinates relative to the specified Datum.

Method Summary

Modifier and Type	Method and Description
XYZ	coords(Datum datum) Get the cartesian coordinates of this Position relative to a specified Datum
double	ellipsoidHeight(Ellipsoid sphere, Datum datum) Calculate the height of this Position above the specified Ellipsoid.
boolean	equals(java.lang.Object o) Compare this Position with another Object
LatLong	toLatLong(Ellipsoid sphere, Datum datum) Get the LatLong of this Position relative to specified Ellipsoid and Datum

Methods inherited from class java.lang.Object

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

Constructor Detail

Position

public Position(XYZ point,
                Datum datum)

Creates a new instance of Position based on cartesian coordinates relative to the specified Datum.

Parameters:

point - XYZ coordinates of this position relative to the specified Datum

datum - The Datum used as the basis of the cartesian coordinates

Position

public Position(LatLong geo,
                double ellipsoidHeight,
                Ellipsoid sphere,
                Datum datum)

Create a new Position using Lat/Long relative to a specified Ellipsoid and Datum

Parameters:

geo - LatLong of the point

ellipsoidHeight - Height above the Ellipsoid of this point (double)

sphere - The Ellipsoid against which this Lat & Lon are defined

datum - The Datum used to measure the Lat & Lon

Method Detail

coords

public XYZ coords(Datum datum)

Get the cartesian coordinates of this Position relative to a specified Datum

Parameters:

datum - The Datum against which to measure the Position

Returns:

Cartesian (XYZ) coordinates of this Position

toLatLong

public LatLong toLatLong(Ellipsoid sphere,
                         Datum datum)

Get the LatLong of this Position relative to specified Ellipsoid and Datum

Parameters:

sphere - The Ellipsoid to use as reference

datum - The Datum to measure relative to

Returns:

A LatLong object for this Position

ellipsoidHeight

public double ellipsoidHeight(Ellipsoid sphere,
                              Datum datum)

Calculate the height of this Position above the specified Ellipsoid.

Parameters:

sphere - The Ellipsoid from which to calculate the height

datum - The Datum defining the location of the Ellipsoid

Returns:

The height in metres of this position above the Ellipsoid

equals

public boolean equals(java.lang.Object o)

Compare this Position with another Object

Overrides:

equals in class java.lang.Object

Parameters:

o - The Object to compare with

Returns:

TRUE if o is an instance of Position co-located with this Position.