org.itc.idv.math
Class TerrainTriangulation
java.lang.Object
org.itc.idv.math.TerrainTriangulation
public class TerrainTriangulation
- extends java.lang.Object
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
TerrainTriangulation
public TerrainTriangulation(double a,
double fInv)
getEquatorRadius
public double getEquatorRadius()
getPhi
public double getPhi()
getLam
public double getLam()
- Returns:
- lam (in radians) needed by SunTriangulation::getTrueSolarTime
getUnitVerticalVector
public Vector3D getUnitVerticalVector(double lat,
double lon)
- Parameters:
lat
- lon
-
- Returns:
- vector of unit length defined by local terrain latlon
and pointing upward, perpendicular to local ellipsoid surface
thus being at right angles to local parallel and to local meridian
Needed for zenith angle calculation
getUnitNorthVector
public Vector3D getUnitNorthVector(double lat,
double lon)
- Parameters:
lat
- lon
-
- Returns:
- vector of unit length defined by local terrain latlon
and pointing northward, tangent to local ellipsoid surface and
tangent to local meridian,
thus being at right angles to local parallel and to local vertical'
Needed for azimuth calculation
getUnitEastVector
public Vector3D getUnitEastVector(double lat,
double lon)
- Parameters:
lat
- lon
-
- Returns:
- vector of unit length defined by local terrain latlon
and pointing eastward, tangent to local ellipsoid surface
thus being at right angles to local meridian and to local vertical.
Needed for azimuth calculation
getTerrainPositionVector
public Vector3D getTerrainPositionVector(double lat,
double lon)
- Parameters:
lat
- latitude in degrees at terrain locationlon
- longitude in degrees at terrain location
- Returns:
- vector from Earth center to terrain position on the
ellipsoid surface and defined by ellipsoidal lat and lon