Package 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:

  • Constructor Details

    • 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 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 parameters for this math transform.
      Overrides:
      getParameterValues in class AbstractMathTransform
      Returns:
      The parameters for this math transform.
      See Also:

    • 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.

    • 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