Package skyview.geometry

Class Util

  • public final class Util
extends java.lang.Object

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static double[] coord​(double[] unit)
      Convert a unit vector to the corresponding coordinates.
      static void coord​(double[] unit, double[] coord)
      Convert a unit vector to the corresponding coordinates.
      static double[] coord​(double x, double y, double z)  
      static double sphdist​(double lon1, double lat1, double lon2, double lat2)
      Distance between two points on a unit sphere.
      static double sphdistDeg​(double lon1, double lat1, double lon2, double lat2)
      Distance between two points on a unit sphere with angles in degres.
      static double[] unit​(double[] coord)
      Convert a coordinate pair to unit vectors
      static void unit​(double[] coord, double[] unitV)
      Convert a coordinate pair to unit vectors.
      static double[] unit​(double ra, double dec)
      Convert a coordinate pair to unit vectors

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • unit

        public static double[] unit​(double ra,
                            double dec)
        Convert a coordinate pair to unit vectors
        Parameters:
        ra - The longitude like coordinate in radians.
        dec - The latitude like coordinate in radians.
        Returns:
        A double[3] unit vector corresponding to the coordinates.

      • unit

        public static double[] unit​(double[] coord)
        Convert a coordinate pair to unit vectors
        Parameters:
        coord - The input coordinates
        Returns:
        A double[3] unit vector corresponding to the coordinates.

      • unit

        public static void unit​(double[] coord,
                        double[] unitV)
        Convert a coordinate pair to unit vectors. The user supplies the array to be filled, assumed to be a vector of length 3. are created in this version.
        Parameters:
        coord - A double[2] vector of coordinates.
        unitV - A pre-allocated double[3] unit vector. The values of this vector will be changed on output.

      • coord

        public static double[] coord​(double[] unit)
        Convert a unit vector to the corresponding coordinates.
        Parameters:
        unit - A double[3] unit vector.
        Returns:
        A double[2] coordinate vector.

      • coord

        public static double[] coord​(double x,
                             double y,
                             double z)

      • coord

        public static void coord​(double[] unit,
                         double[] coord)
        Convert a unit vector to the corresponding coordinates.
        Parameters:
        unit - A double[3] unit vector.
        coord - A double[2] vector to hold the output coordinates.

      • sphdist

        public static double sphdist​(double lon1,
                             double lat1,
                             double lon2,
                             double lat2)
        Distance between two points on a unit sphere.

      • sphdistDeg

        public static double sphdistDeg​(double lon1,
                                double lat1,
                                double lon2,
                                double lat2)
        Distance between two points on a unit sphere with angles in degres.