Package org.geotools.referencing.operation.transform

Class GeocentricTransform

Object
Formattable
AbstractMathTransform
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:

  • Constructor Details

    • 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 Details

    • 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:

    • 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:

    • 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.

    • equals

      public boolean equals(Object o)
      Description copied from class: AbstractMathTransform
      Compares the specified object with this math transform for equality. The default implementation checks if object is an instance of the same class than this and use the same parameter descriptor. Subclasses should override this method in order to compare internal fields.
      Overrides:
      equals in class AbstractMathTransform
      Parameters:
      o - 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.

    • hashCode

      public int hashCode()
      Description copied from class: AbstractMathTransform
      Returns a hash value for this transform.
      Overrides:
      hashCode in class AbstractMathTransform