uk.ac.starlink.ttools.plot2.geom

Class SkySys

java.lang.Object

uk.ac.starlink.ttools.plot2.geom.SkySys

public class SkySys
extends Object

Sky coordinate system definition. These are used to label the system in which sky coordinates are supplied or required by SkyDataGeom so that a transformation can be performed between them if required. It is not an all-singing all-dancing toolkit for sky coordinate system manipulation.

Since:

20 Feb 2013

Author:

Mark Taylor

See Also:

SkyDataGeom

Field Summary

Fields

Modifier and Type	Field and Description
static SkySys	ECLIPTIC2000 Ecliptic system, based on conversion at data 2000.0.
static SkySys	EQUATORIAL J2000 Equatorial sky system.
static SkySys	GALACTIC IAU 1958 Galactic sky system.
static SkySys	SUPERGALACTIC De Vaucouleurs supergalactic system.

Method Summary

Modifier and Type	Method and Description
int[]	getCoordPair(ValueInfo[] infos) Tries to guess at a pair of columns from a given selection that represent the longitude, latitude coordinates in this sky system.
static SkySys[]	getKnownSystems(boolean includeNull) Returns the list of known sky system instances.
String	getLatitudeName() Returns the human-readable name for latitude.
String	getLongitudeName() Returns the human-readable name for longitude.
String	getSysDescription() Returns the description for this system.
String	getSysName() Returns the name for this system.
double[]	toEquatorial() Returns a rotation matrix to convert coordinates in this system to J2000 equatorial coordinates.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

EQUATORIAL

public static final SkySys EQUATORIAL

J2000 Equatorial sky system.

GALACTIC

public static final SkySys GALACTIC

IAU 1958 Galactic sky system.

SUPERGALACTIC

public static final SkySys SUPERGALACTIC

De Vaucouleurs supergalactic system.

ECLIPTIC2000

public static final SkySys ECLIPTIC2000

Ecliptic system, based on conversion at data 2000.0. Probably not respectable.

Method Detail

getSysName

public String getSysName()

Returns the name for this system.

Returns:

name

getSysDescription

public String getSysDescription()

Returns the description for this system.

Returns:

description

getLongitudeName

public String getLongitudeName()

Returns the human-readable name for longitude.

Returns:

longitude coordinate name

getLatitudeName

public String getLatitudeName()

Returns the human-readable name for latitude.

Returns:

latitude coordinate name

toEquatorial

public double[] toEquatorial()

Returns a rotation matrix to convert coordinates in this system to J2000 equatorial coordinates.

Returns:

9-element rotation matrix

getCoordPair

public int[] getCoordPair(ValueInfo[] infos)

Tries to guess at a pair of columns from a given selection that represent the longitude, latitude coordinates in this sky system.

Parameters:

infos - array of metadata items for the available columns

Returns:

2-element array giving indexes into infos array of lon,lat items, or null if attempt fails

toString

public String toString()

Overrides:

toString in class Object

getKnownSystems

public static SkySys[] getKnownSystems(boolean includeNull)

Returns the list of known sky system instances.

Parameters:

includeNull - true if null is to appear in the list

Returns:

list of instances