org.geotools.referencing.operation.transform
Class GeocentricTransform

Object
  extended by Formattable
      extended by AbstractMathTransform
          extended by GeocentricTransform
All Implemented Interfaces:
Serializable, MathTransform

public class GeocentricTransform
extends AbstractMathTransform
implements Serializable

Transforms three dimensional geographic points to geocentric coordinate points. Input points must be longitudes, latitudes and heights above the ellipsoid.

Since:
2.0
Author:
Frank Warmerdam, Martin Desruisseaux (IRD)
See Also:
Serialized Form

Nested Class Summary
static class GeocentricTransform.Provider
          The provider for GeocentricTransform.
static class GeocentricTransform.ProviderInverse
          The provider for inverse of GeocentricTransform.
 
Field Summary
 
Fields inherited from class Formattable
SINGLE_LINE
 
Constructor Summary
GeocentricTransform(double semiMajor, double semiMinor, Unit<Length> units, boolean hasHeight)
          Constructs a transform from the specified parameters.
GeocentricTransform(Ellipsoid ellipsoid, boolean hasHeight)
          Constructs a transform from the specified ellipsoid.
 
Method Summary
 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 parameter values for this math transform.
 int getSourceDimensions()
          Gets the dimension of input points, which is 2 or 3.
 int getTargetDimensions()
          Gets the dimension of output points, which is 3.
 int hashCode()
          Returns a hash value for this transform.
 MathTransform inverse()
          Returns the inverse of this transform.
 void inverseTransform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)
          Converts geocentric coordinates (x, y, z) to geodetic coordinates (longitude, latitude, height), according to the current ellipsoid parameters.
 void inverseTransform(float[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)
          Converts geocentric coordinates (x, y, z) to geodetic coordinates (longitude, latitude, height), according to the current ellipsoid parameters.
 void transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)
          Converts geodetic coordinates (longitude, latitude, height) to geocentric coordinates (x, y, z) according to the current ellipsoid parameters.
 void transform(float[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)
          Converts geodetic coordinates (longitude, latitude, height) to geocentric coordinates (x, y, z) according to the current ellipsoid parameters.
 
Methods inherited from class AbstractMathTransform
createTransformedShape, derivative, derivative, ensureNonNull, formatWKT, getName, isIdentity, needCopy, 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

GeocentricTransform

public GeocentricTransform(Ellipsoid ellipsoid,
                           boolean hasHeight)
Constructs a transform from the specified ellipsoid.

Parameters:
ellipsoid - The ellipsoid.
hasHeight - true if geographic coordinates include an ellipsoidal height (i.e. are 3-D), or false if they are only 2-D.

GeocentricTransform

public GeocentricTransform(double semiMajor,
                           double semiMinor,
                           Unit<Length> units,
                           boolean hasHeight)
Constructs a transform from the specified parameters.

Parameters:
semiMajor - The semi-major axis length.
semiMinor - The semi-minor axis length.
units - The axis units.
hasHeight - true if geographic coordinates include an ellipsoidal height (i.e. are 3-D), or false if they are only 2-D.
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 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()

getSourceDimensions

public int getSourceDimensions()
Gets the dimension of input points, which is 2 or 3.

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, which is 3.

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)
Converts geodetic coordinates (longitude, latitude, height) to geocentric coordinates (x, y, z) according to the current ellipsoid parameters.

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)
Converts geodetic coordinates (longitude, latitude, height) to geocentric coordinates (x, y, z) according to the current ellipsoid parameters.

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.

inverseTransform

public void inverseTransform(double[] srcPts,
                             int srcOff,
                             double[] dstPts,
                             int dstOff,
                             int numPts)
Converts geocentric coordinates (x, y, z) to geodetic coordinates (longitude, latitude, height), according to the current ellipsoid parameters. The method used here is derived from "An Improved Algorithm for Geocentric to Geodetic Coordinate Conversion", by Ralph Toms, Feb 1996.

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.

inverseTransform

public void inverseTransform(float[] srcPts,
                             int srcOff,
                             float[] dstPts,
                             int dstOff,
                             int numPts)
Converts geocentric coordinates (x, y, z) to geodetic coordinates (longitude, latitude, height), according to the current ellipsoid parameters. The method used here is derived from "An Improved Algorithm for Geocentric to Geodetic Coordinate Conversion", by Ralph Toms, Feb 1996.

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.

inverse

public MathTransform inverse()
Returns the inverse of this transform.

Specified by:
inverse in interface MathTransform
Overrides:
inverse in class AbstractMathTransform
Returns:
The inverse transform.

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 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.


Copyright © 1996-2014 Geotools. All Rights Reserved.