org.deegree.crs.transformations.coordinate
Class GeocentricTransform

java.lang.Object
  org.deegree.crs.Identifiable
      org.deegree.crs.transformations.Transformation
          org.deegree.crs.transformations.coordinate.CRSTransformation
              org.deegree.crs.transformations.coordinate.GeocentricTransform

All Implemented Interfaces:

Serializable

public class GeocentricTransform
extends CRSTransformation

The GeocentricTransform class is used to create a transformation between a geocentric CRS (having lat-lon coordinates) and it's geodetic CRS (having x-y-z) coordinates and vice versa.

Version:

$Revision: 19653 $, $Date: 2009-09-15 14:56:30 +0200 (Tue, 15 Sep 2009) $

Author:

Rutger Bezema, last edited by: $Author: rbezema $

See Also:

Serialized Form

Constructor Summary

GeocentricTransform(CoordinateSystem source, GeocentricCRS target)

GeocentricTransform(CoordinateSystem source, GeocentricCRS target, Identifiable id)

Method Summary

List<javax.vecmath.Point3d>	doTransform(List<javax.vecmath.Point3d> srcPts) Do a transformation, e.g. the incoming data will be transformed into other coordinates.
String	getImplementationName()
double	getSemiMajorAxis()
double	getSemiMinorAxis()
void	inverse() This method flags the transformation about it's state.
boolean	isIdentity()
protected void	toGeoCentric(List<javax.vecmath.Point3d> srcPts) Converts geographic (longitude, latitude, height) to cartesian (x,y,z) coordinates.
protected void	toGeographic(List<javax.vecmath.Point3d> srcPts) Converts geocentric coordinates (x, y, z) to geodetic coordinates (longitude, latitude, height), according to the current ellipsoid parameters.

Methods inherited from class org.deegree.crs.transformations.Transformation

areInverse, createFromTo, doTransform, doTransform, getSourceCRS, getSourceDimension, getTargetCRS, getTargetDimension, getTransformationName, getTransformationPath, isInverseTransform, setSourceCRS

Methods inherited from class org.deegree.crs.Identifiable

checkForNullObject, checkForNullObject, checkForNullObject, equals, getAreaOfUse, getAreaOfUseBBox, getAreasOfUse, getDescription, getDescriptions, getIdAndName, getIdentifier, getIdentifiers, getName, getNames, getVersion, getVersions, hasID, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GeocentricTransform

public GeocentricTransform(CoordinateSystem source,
                           GeocentricCRS target,
                           Identifiable id)

Parameters:

source - the geographic crs.

target - the geocentric crs.

id - an identifiable instance containing information about this transformation

GeocentricTransform

public GeocentricTransform(CoordinateSystem source,
                           GeocentricCRS target)

Parameters:

source - the geographic crs.

target - the geocentric crs.

Method Detail

inverse

public void inverse()

Description copied from class: Transformation

This method flags the transformation about it's state. If this transformation was inverse calling this method will result in a forward transformation and vice versa.

Overrides:

inverse in class Transformation

doTransform

public List<javax.vecmath.Point3d> doTransform(List<javax.vecmath.Point3d> srcPts)

Description copied from class: Transformation

Do a transformation, e.g. the incoming data will be transformed into other coordinates.

Specified by:

doTransform in class Transformation

Parameters:

srcPts - the points which must be transformed, expected are following values either, long_1, lat_1, height_1, long_2, lat_2, height_2. or long_1, lat_1, long_2, lat_2

Returns:

the transformed points

toGeographic

protected void toGeographic(List<javax.vecmath.Point3d> srcPts)

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 UCRL-JC-123138.

Parameters:

srcPts - the points which must be transformed.

toGeoCentric

protected void toGeoCentric(List<javax.vecmath.Point3d> srcPts)

Converts geographic (longitude, latitude, height) to cartesian (x,y,z) coordinates.

Parameters:

srcPts - to convert.

isIdentity

public boolean isIdentity()

Specified by:

isIdentity in class Transformation

Returns:

true if this transformation doesn't transform the incoming points. (e.g. is the id. matrix)

getSemiMajorAxis

public final double getSemiMajorAxis()

Returns:

the semiMajorAxis.

getSemiMinorAxis

public final double getSemiMinorAxis()

Returns:

the semiMinorAxis.

getImplementationName

public String getImplementationName()

Specified by:

getImplementationName in class Transformation

Returns:

the name of the transformation.