org.orekit.rugged.intersection

Class ConstantElevationAlgorithm

java.lang.Object

org.orekit.rugged.intersection.ConstantElevationAlgorithm

All Implemented Interfaces:

IntersectionAlgorithm

public class ConstantElevationAlgorithm
extends Object
implements IntersectionAlgorithm

Intersection ignoring Digital Elevation Model.

This dummy implementation simply uses the ellipsoid itself.

Author:

Luc Maisonobe

Constructor Summary

Constructors

Constructor and Description
ConstantElevationAlgorithm(double constantElevation) Simple constructor.

Method Summary

Methods

Modifier and Type	Method and Description
double	getElevation(double latitude, double longitude) Get elevation at a given ground point.
NormalizedGeodeticPoint	intersection(ExtendedEllipsoid ellipsoid, Vector3D position, Vector3D los) Compute intersection of line with Digital Elevation Model.
NormalizedGeodeticPoint	refineIntersection(ExtendedEllipsoid ellipsoid, Vector3D position, Vector3D los, NormalizedGeodeticPoint closeGuess) Refine intersection of line with Digital Elevation Model.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantElevationAlgorithm

public ConstantElevationAlgorithm(double constantElevation)

Simple constructor.

Parameters:

constantElevation - constant elevation over ellipsoid

Method Detail

intersection

public NormalizedGeodeticPoint intersection(ExtendedEllipsoid ellipsoid,
                                   Vector3D position,
                                   Vector3D los)
                                     throws RuggedException

Compute intersection of line with Digital Elevation Model.

Specified by:

intersection in interface IntersectionAlgorithm

Parameters:

ellipsoid - reference ellipsoid

position - pixel position in ellipsoid frame

los - pixel line-of-sight in ellipsoid frame

Returns:

point at which the line first enters ground

Throws:

RuggedException - if intersection cannot be found

refineIntersection

public NormalizedGeodeticPoint refineIntersection(ExtendedEllipsoid ellipsoid,
                                         Vector3D position,
                                         Vector3D los,
                                         NormalizedGeodeticPoint closeGuess)
                                           throws RuggedException

Refine intersection of line with Digital Elevation Model.

This method is used to refine an intersection when a close guess is already known. The intersection is typically looked for by a direct cell intersection in the tile which already contains the close guess, or any similar very fast algorithm.

Specified by:

refineIntersection in interface IntersectionAlgorithm

Parameters:

ellipsoid - reference ellipsoid

position - pixel position in ellipsoid frame

los - pixel line-of-sight in ellipsoid frame

closeGuess - guess close to the real intersection

Returns:

point at which the line first enters ground

Throws:

RuggedException - if intersection cannot be found

getElevation

public double getElevation(double latitude,
                  double longitude)

Get elevation at a given ground point.

As this algorithm uses a constant elevation, this method always returns the same value.

Specified by:

getElevation in interface IntersectionAlgorithm

Parameters:

latitude - ground point latitude

longitude - ground point longitude

Returns:

elevation at specified point