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
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Field Summary
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Constructor Summary
Constructors Constructor Description SphericalCoords()
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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
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Field Details
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dtor
protected static final double dtor- See Also:
- Constant Field Values
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rtod
protected static final double rtod- See Also:
- Constant Field Values
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Constructor Details
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SphericalCoords
public SphericalCoords()
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Method Details
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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.
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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.
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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)
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