Object
- Formattable
- - AbstractMathTransform
  - - NTv2Transform

All Implemented Interfaces:

Serializable, MathTransform, MathTransform2D
```
public class NTv2Transform
extends AbstractMathTransform
implements MathTransform2D, Serializable
```
The "NTv2" coordinate transformation method (EPSG:9615).
This transformation depends on an external resource (the NTv2 grid file). If the file is not available, a recoverable NoSuchIdentifierException will be thrown on instantiation.

Author:

Oscar Fonts

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class NTv2Transform.Provider
The NTv2Transform provider.

Field Summary

Fields
Modifier and Type Field Description

protected static Logger LOGGER
Logger
- Fields inherited from class Formattable
  SINGLE_LINE

Constructor Summary

Constructors
Constructor Description

NTv2Transform(URI file)
Constructs a NTv2Transform from the specified grid shift file.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object object)`	Compares the specified object with this one for equality.
`ParameterValueGroup`	`getParameterValues()`	Returns the parameter values 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.
`MathTransform2D`	`inverse()`	Returns the inverse of this transform.
`void`	`inverseTransform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)`	Inverse transform.
`void`	`transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)`	Transforms a list of coordinate point ordinal values.

Methods inherited from class AbstractMathTransform
createTransformedShape, derivative, derivative, ensureNonNull, formatWKT, getName, getParameterDescriptors, isIdentity, needCopy, normalizeAngle, rollLongitude, transform, 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
derivative, isIdentity, toWKT, transform, transform, transform, transform

Methods inherited from interface MathTransform2D
createTransformedShape, derivative, transform

- Field Detail
  - LOGGER
```
protected static final Logger LOGGER
```
    Logger
- Constructor Detail
  - NTv2Transform
```
public NTv2Transform(URI file)
              throws NoSuchIdentifierException
```
    Constructs a NTv2Transform from the specified grid shift file.
    This constructor checks for grid shift file availability, but doesn't actually load the full grid into memory to preserve resources.
    
    Parameters:
    
    file - NTv2 grid file name
    
    Throws:
    
    NoSuchIdentifierException - if the grid is not available.
- Method Detail
  - hashCode
```
public int hashCode()
```
    Returns a hash value for this transform.
    
    Overrides:
    
    hashCode in class AbstractMathTransform
  - equals
```
public boolean equals(Object object)
```
    Compares the specified object with this one for equality. Checks if object is this same instance, or a NTv2Transform with the same parameter values.
    
    Overrides:
    
    equals in class AbstractMathTransform
    
    Parameters:
    
    object - The object to compare with this transform.
    
    Returns:
    
    true if the given object is this, or a NTv2Transform with same parameter values, which would mean that given identical source position, the transformed position would be the same.
  - inverse
```
public MathTransform2D inverse()
```
    Returns the inverse of this transform.
    
    Specified by:
    
    inverse in interface MathTransform
    
    Specified by:
    
    inverse in interface MathTransform2D
    
    Overrides:
    
    inverse in class AbstractMathTransform
    
    Returns:
    
    the inverse of this transform
  - transform
```
public void transform(double[] srcPts,
                      int srcOff,
                      double[] dstPts,
                      int dstOff,
                      int numPts)
               throws TransformException
```
    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.
    
    Throws:
    
    TransformException - if an IO error occurs reading the grid file.
  - inverseTransform
```
public void inverseTransform(double[] srcPts,
                             int srcOff,
                             double[] dstPts,
                             int dstOff,
                             int numPts)
                      throws TransformException
```
    Inverse transform. See transform(double[], int, double[], int, int)
    
    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.
    
    Throws:
    
    TransformException - if an IO error occurs reading the grid file.
  - getSourceDimensions
```
public int getSourceDimensions()
```
    Description copied from class: AbstractMathTransform
    
    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 int getTargetDimensions()
```
    Description copied from class: AbstractMathTransform
    
    Gets the dimension of output points.
    
    Specified by:
    
    getTargetDimensions in interface MathTransform
    
    Specified by:
    
    getTargetDimensions in class AbstractMathTransform
    
    Returns:
    
    The dimension of output points.
  - getParameterValues
```
public ParameterValueGroup getParameterValues()
```
    Returns the parameter values for this math transform.
    
    Overrides:
    
    getParameterValues in class AbstractMathTransform
    
    Returns:
    
    A copy of the parameter values for this math transform.
    
    See Also:
    
    Operation.getParameterValues()

Class NTv2Transform

Nested Class Summary

Field Summary

Fields inherited from class Formattable

Constructor Summary

Method Summary

Methods inherited from class AbstractMathTransform

Methods inherited from class Formattable

Methods inherited from class Object

Methods inherited from interface MathTransform

Methods inherited from interface MathTransform2D

Field Detail

LOGGER

Constructor Detail

NTv2Transform

Method Detail

hashCode

equals

inverse

transform

inverseTransform

getSourceDimensions

getTargetDimensions

getParameterValues