org.geotools.referencing.operation.transform

Class MolodenskiTransform

Object

Formattable

AbstractMathTransform

MolodenskiTransform

All Implemented Interfaces:

Serializable, MathTransform

public class MolodenskiTransform
extends AbstractMathTransform
implements Serializable

Two- or three-dimensional datum shift using the (potentially abridged) Molodensky transformation. The Molodensky transformation (EPSG code 9604) and the abridged Molodensky transformation (EPSG code 9605) transform two or three dimensional geographic points from one geographic coordinate reference system to another (a datum shift), using three shift parameters (delta X, delta Y, delta Z) and the difference between the semi-major axis and flattenings of the two ellipsoids.

Unlike the Bursa-Wolf 3 parameter method (which acts on geocentric coordinates), this transformation can be performed directly on geographic coordinates.

References:

• Defense Mapping Agency (DMA), Datums, Ellipsoids, Grids and Grid Reference Systems, Technical Manual 8358.1. Available from http://earth-info.nga.mil/GandG/pubs.html
• Defense Mapping Agency (DMA), The Universal Grids: Universal Transverse Mercator (UTM) and Universal Polar Stereographic (UPS), Fairfax VA, Technical Manual 8358.2. Available from http://earth-info.nga.mil/GandG/pubs.html
• National Imagery and Mapping Agency (NIMA), Department of Defense World Geodetic System 1984, Technical Report 8350.2. Available from http://earth-info.nga.mil/GandG/pubs.html
• "Coordinate Conversions and Transformations including Formulas", EPSG Guidence Note Number 7, Version 19.

Since:

2.1

Author:

Rueben Schulz, Martin Desruisseaux

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MolodenskiTransform.Provider The provider for MolodenskiTransform.
static class	MolodenskiTransform.ProviderAbridged The provider for abridged MolodenskiTransform.

Nested classes/interfaces inherited from class AbstractMathTransform

AbstractMathTransform.Inverse

Field Summary

Fields inherited from class Formattable

SINGLE_LINE

Constructor Summary

Constructors

Constructor and Description
MolodenskiTransform(boolean abridged, double a, double b, boolean source3D, double ta, double tb, boolean target3D, double dx, double dy, double dz) Constructs a Molodenski transform from the specified parameters.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object object) Compares the specified object with this math transform for equality.
ParameterDescriptorGroup	getParameterDescriptors() Returns the parameter descriptors for this math transform.
ParameterValueGroup	getParameterValues() Returns the parameters for this math transform.
int	getSourceDimensions() Gets the dimension of input points.
int	getTargetDimensions() Gets the dimension of output points.
int	hashCode() Returns a hash value for this transform.
MathTransform	inverse() Creates the inverse transform of this object.
boolean	isIdentity() Returns true if this transform is the identity one.
void	transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts) Transforms a list of coordinate point ordinal values.
void	transform(float[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts) Transforms a list of coordinate point ordinal values.

Methods inherited from class AbstractMathTransform

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

toWKT

Constructor Detail

MolodenskiTransform

public MolodenskiTransform(boolean abridged,
                           double a,
                           double b,
                           boolean source3D,
                           double ta,
                           double tb,
                           boolean target3D,
                           double dx,
                           double dy,
                           double dz)

Constructs a Molodenski transform from the specified parameters.

Parameters:

abridged - true for the abridged formula, or false for the complete one.

a - The source semi-major axis length in meters.

b - The source semi-minor axis length in meters.

source3D - true if the source has a height.

ta - The target semi-major axis length in meters.

tb - The target semi-minor axis length in meters.

target3D - true if the target has a height.

dx - The x translation in meters.

dy - The y translation in meters.

dz - The z translation in meters.

Method Detail

getParameterDescriptors

public ParameterDescriptorGroup getParameterDescriptors()

Returns the parameter descriptors for this math transform.

Overrides:

getParameterDescriptors in class AbstractMathTransform

Returns:

The parameter descriptors for this math transform, or null.

See Also:

OperationMethod.getParameters()

getParameterValues

public ParameterValueGroup getParameterValues()

Returns the parameters for this math transform.

Overrides:

getParameterValues in class AbstractMathTransform

Returns:

The parameters for this math transform.

See Also:

Operation.getParameterValues()

getSourceDimensions

public int getSourceDimensions()

Gets the dimension of input points.

Specified by:

getSourceDimensions in interface MathTransform

Specified by:

getSourceDimensions in class AbstractMathTransform

Returns:

The dimension of input points.

getTargetDimensions

public final int getTargetDimensions()

Gets the dimension of output points.

Specified by:

getTargetDimensions in interface MathTransform

Specified by:

getTargetDimensions in class AbstractMathTransform

Returns:

The dimension of output points.

transform

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

Transforms a list of coordinate point ordinal values. This method is provided for efficiently transforming many points. The supplied array of ordinal values will contain packed ordinal values. For example, if the source dimension is 3, then the ordinals will be packed in this order:

(x₀,y₀,z₀, x₁,y₁,z₁ ...).

Specified by:

transform in interface MathTransform

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.

transform

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

Transforms a list of coordinate point ordinal values. This method is provided for efficiently transforming many points. The supplied array of ordinal values will contain packed ordinal values. For example, if the source dimension is 3, then the ordinals will be packed in this order:

(x₀,y₀,z₀, x₁,y₁,z₁ ...).

Specified by:

transform in interface MathTransform

Overrides:

transform in class AbstractMathTransform

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.

isIdentity

public boolean isIdentity()

Returns true if this transform is the identity one. This transform is considered identity (minus rounding errors) if:

• the X,Y,Z shift are zero
• the source and target axis length are the same
• the input and output dimension are the same.

Specified by:

isIdentity in interface MathTransform

Overrides:

isIdentity in class AbstractMathTransform

Returns:

true if this MathTransform is an identity transform; false otherwise.

Since:

2.5

inverse

public MathTransform inverse()

Creates the inverse transform of this object.

Specified by:

inverse in interface MathTransform

Overrides:

inverse in class AbstractMathTransform

Returns:

The inverse transform.

hashCode

public final int hashCode()

Returns a hash value for this transform.

Overrides:

hashCode in class AbstractMathTransform

equals

public final boolean equals(Object object)

Compares the specified object with this math transform for equality.

Overrides:

equals in class AbstractMathTransform

Parameters:

object - The object to compare with this transform.

Returns:

true if the given object is a transform of the same class and if, given identical source position, the transformed position would be the equals.