Package edu.sc.seis.TauP

# Class SphericalCoords

java.lang.Object
edu.sc.seis.TauP.SphericalCoords

    public class SphericalCoords
    extends java.lang.Object

Utility class for spherical coordinate (lat-lon) transformations. Given lat, lon, lat, lon you can find the distance or azimuth and given lat, lon, distance, azimuth you can find the lat lon of the resultant point. Just uses spherical relations, no ellpticity correction is applied. See Appendix A of "Seismology and Plate Tectonics" by David Gubbins Cambridge University Press, 1990 and Chapter 3 of "Plate Tectonics: How it Works" by Allan Cox and Robert Brian Hart Blackwell Scientific Publications, 1986

- ## Field Summary

  Fields
  Modifier and Type | Field | Description
  --- | --- | ---
  `protected static double` | `dtor` |
  `protected static double` | `rtod` |

- ## Constructor Summary

  Constructors
  Constructor | Description
  --- | ---
  `SphericalCoords()` |

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `static double` | `azimuth​(double latA, double lonA, double latB, double lonB)` | Calculates azimuth between two lat lon pairs.
  `static double` | `distance​(double latA, double lonA, double latB, double lonB)` | Calculates angular distance between two lat lon pairs.
  `static double` | `latFor​(double latA, double lonA, double distance, double azimuth)` | Calculates the latitude of a point a given distance along a given azimuth from a starting lat lon.
  `static double` | `lonFor​(double latA, double lonA, double distance, double azimuth)` | Calculates the longitude of a point a given distance along a given azimuth from a starting lat lon.
  `static void` | `main​(java.lang.String[] args)` |
  `static double[]` | `rotate​(double latA, double lonA, double[] pole, double angleDeg)` | rotates a point about a pole by an angle.
  `static double[]` | `rotationPole​(double latA, double lonA, double latB, double lonB)` | Find the rotation pole required to rotate the first lat lon pair to the second.

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### dtor

    protected static final double dtor
    See Also:
      Constant Field Values

  - ### rtod

    protected static final double rtod
    See Also:
      Constant Field Values

- ## Constructor Details

  - ### SphericalCoords

    public SphericalCoords()

- ## Method Details

  - ### distance

    public static double distance​(double latA, double lonA, double latB, double lonB)
    Calculates angular distance between two lat lon pairs.

  - ### azimuth

    public static double azimuth​(double latA, double lonA, double latB, double lonB)
    Calculates azimuth between two lat lon pairs.

  - ### rotationPole

    public static double[] rotationPole​(double latA, double lonA, double latB, double lonB)
    Find the rotation pole required to rotate the first lat lon pair to the second. Just does a cross product.
    Returns:
      a 3 element double array with the X, Y and Z components of the pole.

  - ### rotate

    public static double[] rotate​(double latA, double lonA, double[] pole, double angleDeg)
    rotates a point about a pole by an angle.
    Parameters:
      `pole` - is a 3 element double array with X, Y and Z components of the pole.
    Returns:
      [lat, lon] in array.

  - ### latFor

    public static double latFor​(double latA, double lonA, double distance, double azimuth)
    Calculates the latitude of a point a given distance along a given azimuth from a starting lat lon.

  - ### lonFor

    public static double lonFor​(double latA, double lonA, double distance, double azimuth)
    Calculates the longitude of a point a given distance along a given azimuth from a starting lat lon.

  - ### main

    public static void main​(java.lang.String[] args)