Package uk.ac.starlink.ttools.plot2.geom

Class SkySys

  • public class SkySys
extends java.lang.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

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int[] getCoordPair​(uk.ac.starlink.table.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.
      java.lang.String getSysDescription()
      Returns the description for this system.
      java.lang.String getSysName()
      Returns the name for this system.
      double[] toEquatorial()
      Returns a rotation matrix to convert coordinates in this system to J2000 equatorial coordinates.
      java.lang.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 java.lang.String getSysName()
        Returns the name for this system.
        Returns:
        name

      • getSysDescription

        public java.lang.String getSysDescription()
        Returns the description for this system.
        Returns:
        description

      • 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​(uk.ac.starlink.table.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 java.lang.String toString()
        Overrides:
        toString in class java.lang.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