- Abstract
Convert from latitudinal coordinates to spherical coordinates.
- Required_Reading
None.
- Brief_I/O
VARIABLE I/O DESCRIPTION
-------- --- --------------------------------------------------
radius I Distance of a point from the origin.
lon I Angle of the point from the XZ plane in radians.
lat I Angle of the point from the XY plane in radians.
rho O Distance of the point from the origin.
colat O Angle of the point from positive z axis (radians).
lons O Angle of the point from the XZ plane (radians).
- Detailed_Input
radius Distance of a point from the origin.
lon Angle of the point from the XZ plane in radians.
lat Angle of the point from the XY plane in radians.
- Detailed_Output
rho Distance of the point from the origin.
lat Angle between the vector from the origin to the point
and the positive z axis in radians.
lons Angle of the point from the XZ plane (radians).
- Parameters
None.
- Particulars
This routine returns the spherical coordinates of a point
whose position is input in latitudinal coordinates.
Latitudinal coordinates are defined by a distance from a central
reference point, an angle from a reference meridian, and an angle
above the equator of a sphere centered at the central reference
point.
Spherical coordinates are defined by a distance from a central
reference point, an angle from a reference meridian, and an angle
from the z-axis.
- Examples
Co-latitude is obtained by subtracting latitude from HALFPI()
Radius and longitude mean the same thing in both latitudinal
and spherical coordinates. The table below lists lat
corresponding lat in terms of degrees.
lat lat
------ ------
0 90
20 70
45 45
-30 120
90 0
-45 135
- Restrictions
None.
- Exceptions
Error free.
- Files
None.
- Author_and_Institution
W.L. Taber (JPL)
- Literature_References
None.
- Version
-CSPICE Version 1.0.0, 08-FEB-1998 (EDW)
- Index_Entries
latitudinal to spherical coordinates
- Link to routine source