org.jeospace.physics.orbit
Class Visibility

java.lang.Object
  org.jeospace.physics.orbit.Visibility

public class Visibility

extends java.lang.Object

Constant object identifiers of the visibility status of an orbital object

Version:

$Revision: 1.1.1.1 $

Author:

Rex Melton

Field Summary

static Visibility	ASCENDING ASCENDING - object is ascending across the defined horizon
static Visibility	DESCENDING DESCENDING - object is decending across the defined horizon
static Visibility	DOWN DOWN - object is not visible and is below the defined horizon
static Visibility	TRANSIT TRANSIT - object is visible and is crossing the local meridian
static Visibility	UP UP - object is visible above the defined horizon

Constructor Summary

protected

Visibility(java.lang.String status) Restricted Constructor

Method Summary

static Visibility	get(Spherical horizontal, Spherical previous_horizontal) Return an instance of Visibility which cooresponds with the horizontal coordinates of the object.
java.lang.String	toString() Return the String representation of this object

Methods inherited from class java.lang.Object

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

Field Detail

UP

public static final Visibility UP

UP - object is visible above the defined horizon

DOWN

public static final Visibility DOWN

DOWN - object is not visible and is below the defined horizon

TRANSIT

public static final Visibility TRANSIT

TRANSIT - object is visible and is crossing the local meridian

ASCENDING

public static final Visibility ASCENDING

ASCENDING - object is ascending across the defined horizon

DESCENDING

public static final Visibility DESCENDING

DESCENDING - object is decending across the defined horizon

Constructor Detail

Visibility

protected Visibility(java.lang.String status)

Restricted Constructor

Method Detail

get

public static Visibility get(Spherical horizontal,
                             Spherical previous_horizontal)

Return an instance of Visibility which cooresponds with the horizontal coordinates of the object.

Parameters:

horizontal - the current horizontal coordinate of the object

previous_horizontal - the previous horizontal coordinate of the object. If no previous horizontal coordinate is given, then we presume an Earth like situation, where the object is essentially stationary and the position of the object in relation to the direction of the Earth's rotation decides whether the object is ascending or descending. I.E. if the object is to the East - it is presumed to be ascending, to the West - it is presumed to be descending. This may not be a valid convention in all circumstances.

Returns:

the Visibility

toString

public java.lang.String toString()

Return the String representation of this object

Returns:

the String representation of this object