triptracker.core
Class ReferenceEllipsoids

java.lang.Object
  triptracker.core.ReferenceEllipsoids

public class ReferenceEllipsoids
extends Object

The Earth is not an exact ellipsoid. In fact, because the Earth is such a "lumpy" ellipsoid no single smooth ellipsoid will provide a perfect reference surface for the entire Earth.

The practical solution to this is to measure the Earth's shape in different areas and to then create different reference ellipsoids used for mapping different regions on Earth.

Different datums is used for flattening out this lumpy ellipsoid. They create an reference ellipsoid used for mapping different regions on earth. The reference ellipsoid is created by the Earth's radius and the Earths eccentricity values. Evidently, these values are different for each datum.

See Also:

The Earth as an Ellipsoid:

Field Summary

static int	AIRY
static int	AUSTRALIAN_NATIONAL
static int	BESSEL_1841
static int	BESSEL_1841_NAMIBIA
static int	CLARKE_1866
static int	CLARKE_1880
static int	EVEREST
static int	FISHER_1960_MERCURY
static int	FISHER_1968
static int	GRS_1967
static int	GRS_1980
static int	HELMERT_1906
static int	HOUGH
static int	INTERNATIONAL
static int	KRASSOVSKY
static int	MODIFIED_AIRY
static int	MODIFIED_EVEREST
static int	MODIFIED_FISCHER_1960
static int	SOUTH_AMERICAN_1969
static int	WGS_60
static int	WGS_66
static int	WGS_72
static int	WGS_84

Method Summary

static Ellipsoid	getEllipsoid(int i)
static Ellipsoid[]	getEllipsoids()

Methods inherited from class java.lang.Object

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

Field Detail

AIRY

public static final int AIRY

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Constant Field Values

AUSTRALIAN_NATIONAL

public static final int AUSTRALIAN_NATIONAL

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Constant Field Values

BESSEL_1841

public static final int BESSEL_1841

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Constant Field Values

BESSEL_1841_NAMIBIA

public static final int BESSEL_1841_NAMIBIA

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Constant Field Values

CLARKE_1866

public static final int CLARKE_1866

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Constant Field Values

CLARKE_1880

public static final int CLARKE_1880

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Constant Field Values

EVEREST

public static final int EVEREST

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Constant Field Values

FISHER_1960_MERCURY

public static final int FISHER_1960_MERCURY

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Constant Field Values

FISHER_1968

public static final int FISHER_1968

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Constant Field Values

GRS_1967

public static final int GRS_1967

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Constant Field Values

GRS_1980

public static final int GRS_1980

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Constant Field Values

HELMERT_1906

public static final int HELMERT_1906

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Constant Field Values

HOUGH

public static final int HOUGH

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Constant Field Values

INTERNATIONAL

public static final int INTERNATIONAL

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Constant Field Values

KRASSOVSKY

public static final int KRASSOVSKY

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Constant Field Values

MODIFIED_AIRY

public static final int MODIFIED_AIRY

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Constant Field Values

MODIFIED_EVEREST

public static final int MODIFIED_EVEREST

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Constant Field Values

MODIFIED_FISCHER_1960

public static final int MODIFIED_FISCHER_1960

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Constant Field Values

SOUTH_AMERICAN_1969

public static final int SOUTH_AMERICAN_1969

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Constant Field Values

WGS_60

public static final int WGS_60

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Constant Field Values

WGS_66

public static final int WGS_66

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Constant Field Values

WGS_72

public static final int WGS_72

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Constant Field Values

WGS_84

public static final int WGS_84

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Constant Field Values

Method Detail

getEllipsoid

public static Ellipsoid getEllipsoid(int i)

getEllipsoids

public static Ellipsoid[] getEllipsoids()