Package org.geotools.referencing.operation.projection

Class GeneralOblique

Object

Formattable

AbstractMathTransform

MapProjection

GeneralOblique

All Implemented Interfaces:

Serializable, MathTransform, MathTransform2D

public class GeneralOblique
extends MapProjection

General Oblique Transformation projection useful for rotated spherical coordinates ("Rotated Pole"), commonly used in numerical weather forecasting models.

Based on the code provided by Jürgen Seib (Deutscher Wetterdienst), adopted to follow "+proj=ob_tran" behaviour.

For examples see "GeneralOblique.txt" file in tests directory

Since:

13.1

Author:

Maciej Filocha (ICM)

See Also:

• COSMO User Manual, Part 1
• proj.4
• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GeneralOblique.Provider	The math transform provider for an General Oblique Transformation projection.

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	GeneralOblique(ParameterValueGroup parameters)	Constructs a rotated latitude/longitude projection.

Method Summary

Modifier and Type	Method	Description
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 (units in radians) and stores the result in ptDst (linear distance on a unit sphere).
protected Point2D	transformNormalized(double x, double y, Point2D ptDst)	Transforms the specified (λ,φ) coordinates (units in radians) and stores the result in ptDst (linear distance on a unit sphere).

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

GeneralOblique

protected GeneralOblique(ParameterValueGroup parameters)
                  throws ParameterNotFoundException

Constructs a rotated latitude/longitude projection.

Parameters:

parameters - The group of parameter values.

Throws:

ParameterNotFoundException - if a required parameter was not found.

Method Details

transformNormalized

protected Point2D transformNormalized(double x,
 double y,
 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:

x - The longitude of the coordinate, in radians.

y - 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 (units in radians) and stores the result in ptDst (linear distance on a unit sphere).

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.

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()