org.deegree.crs.projections.azimuthal
Class AzimuthalProjection

java.lang.Object
  org.deegree.crs.Identifiable
      org.deegree.crs.projections.Projection
          org.deegree.crs.projections.azimuthal.AzimuthalProjection

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

LambertAzimuthalEqualArea, StereographicAlternative, StereographicAzimuthal

public abstract class AzimuthalProjection
extends Projection

The AzimuthalProjection class functions as a super class to all azimuthal projections.

(From wikipedia) Azimuthal projections have the property that directions from a central point are preserved (and hence, great circles through the central point are represented by straight lines on the map). Usually these projections also have radial symmetry in the scales and hence in the distortions: map distances from the central point are computed by a function r(d) of the true distance d, independent of the angle; correspondingly, circles with the central point as center are mapped into circles which have as center the central point on the map.

The mapping of radial lines can be visualized by imagining a plane tangent to the Earth, with the central point as tangent point.

Version:

$Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $

Author:

Rutger Bezema, last edited by: $Author: mschneider $

See Also:

Serialized Form

Field Summary

static int	EQUATOR Defining that the center of this azimuthal projection is at the equator
static int	NORTH_POLE Defining that the center of this azimuthal projection is at the north pole
static int	OBLIQUE Defining that the center of this azimuthal projection is oblique
static int	SOUTH_POLE Defining that the center of this azimuthal projection is at the south pole

Constructor Summary

AzimuthalProjection(GeographicCRS geographicCRS, double falseNorthing, double falseEasting, javax.vecmath.Point2d naturalOrigin, Unit units, double scale, boolean conformal, boolean equalArea, Identifiable id)

Method Summary

int	getMode()
int	hashCode() Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast.

Methods inherited from class org.deegree.crs.projections.Projection

doInverseProjection, doProjection, equals, getCosphi0, getDatum, getEccentricity, getEllipsoid, getFalseEasting, getFalseNorthing, getGeographicCRS, getImplementationName, getNaturalOrigin, getPrimeMeridian, getProjectionLatitude, getProjectionLongitude, getScale, getScaleFactor, getSemiMajorAxis, getSemiMinorAxis, getSinphi0, getSquaredEccentricity, getUnits, isConformal, isEqualArea, isSpherical, setFalseEasting, setScale, toString

Methods inherited from class org.deegree.crs.Identifiable

checkForNullObject, checkForNullObject, checkForNullObject, getAreaOfUse, getAreaOfUseBBox, getAreasOfUse, getDescription, getDescriptions, getIdAndName, getIdentifier, getIdentifiers, getName, getNames, getVersion, getVersions, hasID

Methods inherited from class java.lang.Object

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

Field Detail

NORTH_POLE

public static final int NORTH_POLE

Defining that the center of this azimuthal projection is at the north pole

See Also:

Constant Field Values

SOUTH_POLE

public static final int SOUTH_POLE

Defining that the center of this azimuthal projection is at the south pole

See Also:

Constant Field Values

EQUATOR

public static final int EQUATOR

Defining that the center of this azimuthal projection is at the equator

See Also:

Constant Field Values

OBLIQUE

public static final int OBLIQUE

Defining that the center of this azimuthal projection is oblique

See Also:

Constant Field Values

Constructor Detail

AzimuthalProjection

public AzimuthalProjection(GeographicCRS geographicCRS,
                           double falseNorthing,
                           double falseEasting,
                           javax.vecmath.Point2d naturalOrigin,
                           Unit units,
                           double scale,
                           boolean conformal,
                           boolean equalArea,
                           Identifiable id)

Parameters:

geographicCRS -

falseNorthing -

falseEasting -

naturalOrigin -

units -

scale -

conformal -

equalArea -

id - an identifiable instance containing information about this projection

Method Detail

getMode

public final int getMode()

Returns:

the mode.

hashCode

public int hashCode()

Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast. It is created from field f as follows:

• boolean -- code = (f ? 0 : 1)
• byte, char, short, int -- code = (int)f
• long -- code = (int)(f ^ (f >>>32))
• float -- code = Float.floatToIntBits(f);
• double -- long l = Double.doubleToLongBits(f); code = (int)(l ^ (l >>> 32))
• all Objects, (where equals( ) calls equals( ) for this field) -- code = f.hashCode( )
• Array -- Apply above rules to each element

Combining the hash code(s) computed above: result = 37 * result + code;

Overrides:

hashCode in class Projection

Returns:

(int) ( result >>> 32 ) ^ (int) result;

See Also:

Object.hashCode()