Class VerticalTransform

  • All Implemented Interfaces:
    MathTransform
    Direct Known Subclasses:
    EarthGravitationalModel

    public abstract class VerticalTransform
    extends AbstractMathTransform
    Base class for transformations from a height above the ellipsoid to a height above the geoid. This transform expects three-dimensional geographic coordinates in (longitude,latitude,height) order. The transformations are usually backed by some ellipsoid-dependent database.
    Since:
    2.3
    Author:
    Martin Desruisseaux
    • Constructor Detail

      • VerticalTransform

        protected VerticalTransform()
        Creates a new instance of VerticalTransform.
    • Method Detail

      • heightOffset

        protected abstract double heightOffset​(double longitude,
                                               double latitude,
                                               double height)
                                        throws TransformException
        Returns the value to add to a height above the ellipsoid in order to get a height above the geoid for the specified geographic coordinate.
        Parameters:
        longitude - The geodetic longitude, in decimal degrees.
        latitude - The geodetic latitude, in decimal degrees.
        height - The height above the ellipsoid in metres.
        Returns:
        The value to add in order to get the height above the geoid (in metres).
        Throws:
        TransformException - if the offset can't be computed for the specified coordinates.
      • transform

        public void transform​(float[] srcPts,
                              int srcOff,
                              float[] dstPts,
                              int dstOff,
                              int numPts)
                       throws TransformException
        Transforms a list of coordinate point ordinal values.
        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.
        Throws:
        TransformException - if a point can't be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the untransformable points with NaN values, continue and throw the exception only at end. Implementations that fall in the later case should set the last completed transform to this.
      • transform

        public void transform​(double[] srcPts,
                              int srcOff,
                              double[] dstPts,
                              int dstOff,
                              int numPts)
                       throws TransformException
        Transforms a list of coordinate point ordinal values.
        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 a point can't be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the untransformable points with NaN values, continue and throw the exception only at end. Implementations that fall in the later case should set the last completed transform to this.