Class AlbersProjection

java.lang.Object

org.locationtech.proj4j.proj.Projection

org.locationtech.proj4j.proj.AlbersProjection

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

LambertEqualAreaConicProjection

public class AlbersProjection
extends Projection

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private double	c
private double	dd
private double	ec
private double[]	en
private static final double	EPS10
private static final double	EPSILON
private double	n
private static final int	N_ITER
private double	n2
private double	phi1
private double	phi2
private double	rho0
private static final double	TOL
private static final double	TOL7

Fields inherited from class Projection

a, alpha, DTR, e, ellipsoid, es, falseEasting, falseNorthing, fromMetres, geocentric, lonc, maxLatitude, maxLongitude, minLatitude, minLongitude, name, one_es, projectionLatitude, projectionLatitude1, projectionLatitude2, projectionLongitude, rone_es, RTD, scaleFactor, spherical, totalScale, trueScaleLatitude, unit

Constructor Summary

Constructors

Constructor	Description
AlbersProjection()

Method Summary

Modifier and Type	Method	Description
int	getEPSGCode()	Returns the ESPG code for this projection, or 0 if unknown.
boolean	hasInverse()	Tests whether this projection has an inverse.
void	initialize()	Initialize the projection.
boolean	isEqualArea()	Returns true if this projection is equal area
private static double	phi1_(double qs, double Te, double Tone_es)
ProjCoordinate	project(double lplam, double lpphi, ProjCoordinate out)	Computes the projection of a given point (i.e.
ProjCoordinate	projectInverse(double xyx, double xyy, ProjCoordinate out)	Computes the inverse projection of a given point (i.e.
String	toString()

Methods inherited from class Projection

clone, equals, getAlpha, getAxisOrder, getEllipsoid, getEquatorRadius, getFalseEasting, getFalseNorthing, getFromMetres, getHeightOfOrbit, getLonC, getMaxLatitude, getMaxLatitudeDegrees, getMaxLongitude, getMaxLongitudeDegrees, getMinLatitude, getMinLatitudeDegrees, getMinLongitude, getMinLongitudeDegrees, getName, getPrimeMeridian, getPROJ4Description, getProjectionLatitude, getProjectionLatitude1, getProjectionLatitude1Degrees, getProjectionLatitude2, getProjectionLatitude2Degrees, getProjectionLatitudeDegrees, getProjectionLongitude, getProjectionLongitudeDegrees, getScaleFactor, getSouthernHemisphere, getTrueScaleLatitude, getTrueScaleLatitudeDegrees, getUnits, hashCode, inside, inverseProject, inverseProjectRadians, isConformal, isGeographic, isRectilinear, normalizeLongitude, normalizeLongitudeRadians, parallelsAreParallel, project, projectRadians, setAlpha, setAlphaDegrees, setAxisOrder, setEllipsoid, setFalseEasting, setFalseNorthing, setFromMetres, setGamma, setGammaDegrees, setHeightOfOrbit, setLonC, setLonCDegrees, setMaxLatitude, setMaxLongitude, setMaxLongitudeDegrees, setMinLatitude, setMinLongitude, setMinLongitudeDegrees, setName, setNoUoff, setPrimeMeridian, setProjectionLatitude, setProjectionLatitude1, setProjectionLatitude1Degrees, setProjectionLatitude2, setProjectionLatitude2Degrees, setProjectionLatitudeDegrees, setProjectionLongitude, setProjectionLongitudeDegrees, setRadius, setScaleFactor, setSouthernHemisphere, setTrueScaleLatitude, setTrueScaleLatitudeDegrees, setUnits

Methods inherited from class Object

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

Field Details

EPS10

private static final double EPS10

See Also:

• Constant Field Values

TOL7

private static final double TOL7

See Also:

• Constant Field Values

ec

private double ec

n

private double n

c

private double c

dd

private double dd

n2

private double n2

rho0

private double rho0

phi1

private double phi1

phi2

private double phi2

en

private double[] en

N_ITER

private static final int N_ITER

See Also:

• Constant Field Values

EPSILON

private static final double EPSILON

See Also:

• Constant Field Values

TOL

private static final double TOL

See Also:

• Constant Field Values

Constructor Details

AlbersProjection

public AlbersProjection()

Method Details

phi1_

private static double phi1_(double qs,
 double Te,
 double Tone_es)

project

public ProjCoordinate project(double lplam,
 double lpphi,
 ProjCoordinate out)

Description copied from class: Projection

Computes the projection of a given point (i.e. from geographics to projection space). This should be overridden for all projections.

Overrides:

project in class Projection

Parameters:

lplam - the geographic x ordinate (in radians)

lpphi - the geographic y ordinatee (in radians)

out - the projected coordinate (in coordinate system units)

Returns:

the target coordinate

projectInverse

public ProjCoordinate projectInverse(double xyx,
 double xyy,
 ProjCoordinate out)

Description copied from class: Projection

Computes the inverse projection of a given point (i.e. from projection space to geographics). This should be overridden for all projections.

Overrides:

projectInverse in class Projection

Parameters:

xyx - the projected x ordinate (in coordinate system units)

xyy - the projected y ordinate (in coordinate system units)

out - the inverse-projected geographic coordinate (in radians)

Returns:

the target coordinate

initialize

public void initialize()

Description copied from class: Projection

Initialize the projection. This should be called after setting parameters and before using the projection. This is for performance reasons as initialization may be expensive.

Overrides:

initialize in class Projection

isEqualArea

public boolean isEqualArea()

Returns true if this projection is equal area

Overrides:

isEqualArea in class Projection

Returns:

true if this projection is equal-area

hasInverse

public boolean hasInverse()

Description copied from class: Projection

Tests whether this projection has an inverse. If this method returns true then the Projection.inverseProject(ProjCoordinate, ProjCoordinate) and Projection.inverseProjectRadians(ProjCoordinate, ProjCoordinate) methods will return meaningful results.

Overrides:

hasInverse in class Projection

Returns:

true if this projection has an inverse

getEPSGCode

public int getEPSGCode()

Returns the ESPG code for this projection, or 0 if unknown.

Overrides:

getEPSGCode in class Projection

toString

public String toString()

Overrides:

toString in class Projection