mccombe.mapping
Class Ellipsoid

java.lang.Object
  mccombe.mapping.Ellipsoid

public class Ellipsoid
extends java.lang.Object

Ellipsoid is the base class used to describe the shape of the earth's surface. It is a biaxial ellipsoid, slightly flattened at the poles.

Field Summary

static Ellipsoid	AIRY The Airy Sphere 1830 - "best fit" Ellipsoid for Great Britain
static Ellipsoid	BESSEL The Bessel 1841 Ellipsoid.
static Ellipsoid	CLARKE The Clarke (1880) Ellipsoid.
static Ellipsoid	GRS80 The GRS80 Ellipsoid - "Best fit" ellipsoid for the whole Earth.
static Ellipsoid	HAYFORD The Hayford (1909) Ellipsoid.
static Ellipsoid	INTERNATIONAL The Bessel 1841 Ellipsoid.
static Ellipsoid	MODIFIED_AIRY The "Modified Airy" ellipsoid.

Constructor Summary

protected

Ellipsoid(java.lang.String name, double major, double minor) Create an Ellipsoid with specified major and minor exes.

Method Summary

protected double	eccsq() The eccentricity squared for this Ellipsoid.
double	majoraxis() Major Axis (m) of the spheroid
double	minoraxis() Minor axis (m) of the spheroid
java.lang.String	toString() Provide a String identifying this Ellipsoid

Methods inherited from class java.lang.Object

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

Field Detail

AIRY

public static final Ellipsoid AIRY

The Airy Sphere 1830 - "best fit" Ellipsoid for Great Britain

CLARKE

public static final Ellipsoid CLARKE

The Clarke (1880) Ellipsoid. Used in France with the NTF Datum and Lambert Conformal Conical (LCC) projection

HAYFORD

public static final Ellipsoid HAYFORD

The Hayford (1909) Ellipsoid. Typically used with he European 1950 (ED50) Datum

GRS80

public static final Ellipsoid GRS80

The GRS80 Ellipsoid - "Best fit" ellipsoid for the whole Earth. Defined for Global Positioning System (GPS) and used with the WGS84 Datum.

MODIFIED_AIRY

public static final Ellipsoid MODIFIED_AIRY

The "Modified Airy" ellipsoid. The "best fit" Ellipsoid for Ireland and used with the Irish Grid.

BESSEL

public static final Ellipsoid BESSEL

The Bessel 1841 Ellipsoid. Used with the Austrian Grid

INTERNATIONAL

public static final Ellipsoid INTERNATIONAL

The Bessel 1841 Ellipsoid. Used with the Austrian Grid

Constructor Detail

Ellipsoid

protected Ellipsoid(java.lang.String name,
                    double major,
                    double minor)

Create an Ellipsoid with specified major and minor exes.

Parameters:

name - Defines the name of this Ellipsoid

major - Major axis (m)

minor - Minor axis (m)

Method Detail

majoraxis

public double majoraxis()

Major Axis (m) of the spheroid

Returns:

The major axis of the Ellipsoid

minoraxis

public double minoraxis()

Minor axis (m) of the spheroid

Returns:

The minor axis (m) of the Ellipsoid

eccsq

protected double eccsq()

The eccentricity squared for this Ellipsoid.

Returns:

the eccentricity squared ( i.e. (a^2 - b^2)/(a^2)

toString

public java.lang.String toString()

Provide a String identifying this Ellipsoid

Overrides:

toString in class java.lang.Object

Returns:

The name of this Ellipsoid