Package skyview.geometry
Class Util
java.lang.Object
skyview.geometry.Util
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Method Summary
Modifier and TypeMethodDescriptionstatic 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 vectorsstatic 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
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Method Details
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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.
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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.
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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.
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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.
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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.
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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.
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