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


Constructor Summary
SphericalCoords()
           
 
Method Summary
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
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SphericalCoords

public SphericalCoords()
Method Detail

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.

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.

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)