Package org.apache.sis.referencing.operation.transform

Class AbridgedMolodenskyTransform2D

java.lang.Object

org.apache.sis.io.wkt.FormattableObject

org.apache.sis.referencing.operation.transform.AbstractMathTransform

org.apache.sis.referencing.operation.transform.DatumShiftTransform

org.apache.sis.referencing.operation.transform.MolodenskyFormula

org.apache.sis.referencing.operation.transform.MolodenskyTransform

org.apache.sis.referencing.operation.transform.MolodenskyTransform2D

org.apache.sis.referencing.operation.transform.AbridgedMolodenskyTransform2D

All Implemented Interfaces:

Serializable, Parameterized, LenientComparable, org.opengis.referencing.operation.MathTransform, org.opengis.referencing.operation.MathTransform2D

final class AbridgedMolodenskyTransform2D
extends MolodenskyTransform2D

Two-dimensional abridged Molodensky transform with all translation terms fixed to zero. This implementation performs only a change of ellipsoid. It provides nothing new compared to MolodenskyFormula, except performance.

Note: this transform is yet more abridged than standard "abridged Molondensky" transform since it sets all translation terms to zero. A better class name could be "Very abridged Molodensky transform". For the usual abridged Molondensky with non-zero translation terms, use the parent class.

Since:

0.8

Version:

0.8

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform

AbstractMathTransform.Inverse

Field Summary

Fields

Modifier and Type	Field	Description
private double	scale	A combination of MolodenskyFormula.ANGULAR_SCALE with other fields in an expression that become constants because of the simplification applied in this AbridgedMolodenskyTransform2D.
private static final long	serialVersionUID	Serial number for inter-operability with different versions.

Fields inherited from class org.apache.sis.referencing.operation.transform.MolodenskyFormula

ANGULAR_SCALE, eccentricitySquared, isAbridged, isSource3D, isTarget3D, semiMajor, tX, tY, tZ, Δa, Δfmod

Fields inherited from class org.apache.sis.referencing.operation.transform.DatumShiftTransform

context, grid

Fields inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform

MAXIMUM_BUFFER_SIZE, MAXIMUM_FAILURES

Constructor Summary

Constructors

Constructor	Description
AbridgedMolodenskyTransform2D(MolodenskyTransform inverse, org.opengis.referencing.datum.Ellipsoid source, org.opengis.referencing.datum.Ellipsoid target)	Constructs the inverse of a 2D transform.
AbridgedMolodenskyTransform2D(org.opengis.referencing.datum.Ellipsoid source, org.opengis.referencing.datum.Ellipsoid target)	Constructs a 2D transform.

Method Summary

Modifier and Type	Method	Description
private void	computeTransientFields()	Computes the scale field from existing fields.
private void	readObject(ObjectInputStream in)	Invoked on deserialization for restoring the scale field.
void	transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)	Transforms the (λ,φ) coordinates between two geographic CRS.

Methods inherited from class org.apache.sis.referencing.operation.transform.MolodenskyTransform2D

createTransformedShape, derivative, inverse, transform

Methods inherited from class org.apache.sis.referencing.operation.transform.MolodenskyTransform

completeParameters, createGeodeticTransformation, getParameterDescriptors, isIdentity, transform

Methods inherited from class org.apache.sis.referencing.operation.transform.MolodenskyFormula

computeHashCode, equals, getParameterValues, getSourceDimensions, getTargetDimensions, transform

Methods inherited from class org.apache.sis.referencing.operation.transform.DatumShiftTransform

ensureGeocentricTranslation, getContextualParameters, normalizedToGridX, normalizedToGridY, setContextParameters

Methods inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform

beforeFormat, derivative, equals, formatTo, getDomain, hashCode, isInverseEquals, mismatchedDimension, transform, transform, transform, transform, tryConcatenate

Methods inherited from class org.apache.sis.io.wkt.FormattableObject

print, toString, toString, toWKT

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opengis.referencing.operation.MathTransform

derivative, getSourceDimensions, getTargetDimensions, isIdentity, toWKT, transform, transform, transform, transform

Field Details

serialVersionUID

private static final long serialVersionUID

Serial number for inter-operability with different versions.

See Also:

• Constant Field Values

scale

private transient double scale

A combination of MolodenskyFormula.ANGULAR_SCALE with other fields in an expression that become constants because of the simplification applied in this AbridgedMolodenskyTransform2D.

Constructor Details

AbridgedMolodenskyTransform2D

AbridgedMolodenskyTransform2D(org.opengis.referencing.datum.Ellipsoid source,
 org.opengis.referencing.datum.Ellipsoid target)

Constructs a 2D transform.

AbridgedMolodenskyTransform2D

AbridgedMolodenskyTransform2D(MolodenskyTransform inverse,
 org.opengis.referencing.datum.Ellipsoid source,
 org.opengis.referencing.datum.Ellipsoid target)

Constructs the inverse of a 2D transform.

Parameters:

inverse - the transform for which to create the inverse.

source - the source ellipsoid of the given inverse transform.

target - the target ellipsoid of the given inverse transform.

Method Details

readObject

private void readObject(ObjectInputStream in)
                 throws IOException,
ClassNotFoundException

Invoked on deserialization for restoring the scale field.

Parameters:

in - the input stream from which to deserialize a math transform.

Throws:

IOException - if an I/O error occurred while reading or if the stream contains invalid data.

ClassNotFoundException - if the class serialized on the stream is not on the classpath.

computeTransientFields

private void computeTransientFields()

Computes the scale field from existing fields.

transform

public void transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 int numPts)

Transforms the (λ,φ) coordinates between two geographic CRS. This method performs the same transformation than MolodenskyTransform, but the formulas are repeated and simplified here for performance reasons. In addition of using abridged Molodensky formulas, this method assumes that MolodenskyFormula.tX, MolodenskyFormula.tY and MolodenskyFormula.tZ fields are zero.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class MolodenskyTransform

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.