Package org.geotools.referencing.operation.projection

Class Homolosine

Object

Formattable

AbstractMathTransform

MapProjection

Homolosine

All Implemented Interfaces:

Serializable, MathTransform, MathTransform2D

public class Homolosine
extends MapProjection

Homolosine projection

Since:

22.x

Author:

Luís M. de Sousa

See Also:

• Goode, J.P. (1925). "The Homolosine projection - a new device for portraying the Earth's surface entire". Annals of the Association of American Geographers. 15 (3): 119–125
• The Homolosine projection on Wikipedia
• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Homolosine.Provider	The math transform provider for the Homolosine projection (not part of the EPSG database).

Nested classes/interfaces inherited from class MapProjection

MapProjection.AbstractProvider

Field Summary

Fields inherited from class MapProjection

centralMeridian, en0, en1, en2, en3, en4, excentricity, excentricitySquared, falseEasting, falseNorthing, globalScale, invertible, isSpherical, latitudeOfOrigin, LOGGER, scaleFactor, semiMajor, semiMinor, SKIP_SANITY_CHECKS

Fields inherited from class Formattable

SINGLE_LINE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Homolosine(ParameterDescriptorGroup descriptors, ParameterValueGroup parameters)	Constructs a new map projection from the supplied parameters.

Method Summary

Modifier and Type	Method	Description
protected double	computeOffset()	Computes the Northing difference between Sinusoidal and Mollweide at the threshold latitude.
ParameterDescriptorGroup	getParameterDescriptors()	Returns the parameter descriptors for this map projection.
protected Point2D	inverseTransformNormalized(double x, double y, Point2D ptDst)	Transforms the specified (x,y) coordinates and stores the result in ptDst.
protected Point2D	transformNormalized(double lam, double phi, Point2D ptDst)	Transforms the specified (λ,φ) coordinates (units in radians) and stores the result in ptDst (linear distance on a unit sphere).
protected double	wrapLatitude(double phi)	Wraps latitude angles around.
protected double	wrapLongitude(double lam)	Wraps longitude angles around.

Methods inherited from class MapProjection

checkReciprocal, equals, getParameterValues, getSourceDimensions, getTargetDimensions, getToleranceForAssertions, hashCode, inv_mlfn, inverse, mlfn, orthodromicDistance, resetWarnings, transform, transform, transform

Methods inherited from class AbstractMathTransform

createTransformedShape, derivative, derivative, ensureNonNull, formatWKT, getName, isIdentity, needCopy, normalizeAngle, rollLongitude, transform, transform, transform

Methods inherited from class Formattable

cleanupThreadLocals, toString, toWKT, toWKT, toWKT, toWKT

Methods inherited from class Object

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

Methods inherited from interface MathTransform

derivative, isIdentity, toWKT, transform, transform, transform

Methods inherited from interface MathTransform2D

createTransformedShape, derivative

Constructor Details

Homolosine

protected Homolosine(ParameterDescriptorGroup descriptors,
 ParameterValueGroup parameters)
              throws ParameterNotFoundException

Constructs a new map projection from the supplied parameters.

Parameters:

parameters - The parameter values in standard units.

Throws:

ParameterNotFoundException - if a mandatory parameter is missing.

Method Details

getParameterDescriptors

public ParameterDescriptorGroup getParameterDescriptors()

Returns the parameter descriptors for this map projection. This is used for a providing a default implementation of MapProjection.getParameterValues(), as well as arguments checking.

Specified by:

getParameterDescriptors in class MapProjection

Returns:

The parameter descriptors for this math transform, or null.

See Also:

• OperationMethod.getParameters()

computeOffset

protected double computeOffset()
                        throws ProjectionException

Computes the Northing difference between Sinusoidal and Mollweide at the threshold latitude.

Returns:

Northing offset between Sinusoidal and Mollweide at threshold latitude.

Throws:

ProjectionException

wrapLongitude

protected double wrapLongitude(double lam)
                        throws ProjectionException

Wraps longitude angles around.

Parameters:

lam - A longitude angle in radians .

Returns:

Longitude angle within the [-PI, PI] interval.

Throws:

ProjectionException

wrapLatitude

protected double wrapLatitude(double phi)
                       throws ProjectionException

Wraps latitude angles around.

Parameters:

phi - A latitude angle in radians.

Returns:

Latitude angle within the [-PI/2, PI/2] interval.

Throws:

ProjectionException

transformNormalized

protected Point2D transformNormalized(double lam,
 double phi,
 Point2D ptDst)
                               throws ProjectionException

Transforms the specified (λ,φ) coordinates (units in radians) and stores the result in ptDst (linear distance on a unit sphere).

Specified by:

transformNormalized in class MapProjection

Parameters:

lam - The longitude of the coordinate, in radians.

phi - The latitude of the coordinate, in radians.

ptDst - the specified coordinate point that stores the result of transforming ptSrc, or null. Ordinates will be in a dimensionless unit, as a linear distance on a unit sphere or ellipse.

Returns:

the coordinate point after transforming (lambda, phi) and storing the result in ptDst.

Throws:

ProjectionException - if the point can't be transformed.

inverseTransformNormalized

protected Point2D inverseTransformNormalized(double x,
 double y,
 Point2D ptDst)
                                      throws ProjectionException

Transforms the specified (x,y) coordinates and stores the result in ptDst.

Specified by:

inverseTransformNormalized in class MapProjection

Parameters:

x - The easting of the coordinate, linear distance on a unit sphere or ellipse.

y - The northing of the coordinate, linear distance on a unit sphere or ellipse.

ptDst - the specified coordinate point that stores the result of transforming ptSrc, or null. Ordinates will be in radians.

Returns:

the coordinate point after transforming x, y and storing the result in ptDst.

Throws:

ProjectionException - if the point can't be transformed.