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latcyl_c
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Procedure
Abstract
Required_Reading
Keywords
Brief_I/O
Detailed_Input
Detailed_Output
Parameters
Exceptions
Files
Particulars
Examples
Restrictions
Literature_References
Author_and_Institution
Version
Index_Entries

Procedure

   void latcyl_c ( SpiceDouble    radius,
                   SpiceDouble    lon,
                   SpiceDouble    lat,
                   SpiceDouble *  r,
                   SpiceDouble *  lonc,
                   SpiceDouble *  z )

Abstract

   Convert from latitudinal coordinates to cylindrical coordinates.

Required_Reading

   None.

Keywords

   CONVERSION,  COORDINATES


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.
   r          O   Distance of the point from the z axis.
   lonc       O   Angle of the point from the XZ plane in radians.
   z          O   Height of the point above the XY plane.

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

   r          Distance of the point from the z axis.

   lonc       Angle of the point from the XZ plane in radians.
              `lonc' is set equal to `lon'.

   z          Height of the point above the XY plane.

Parameters

   None.

Exceptions

   Error free.

Files

   None.

Particulars

   This routine returns the cylindrical 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.

Examples

   Other than the obvious conversion between coordinate systems
   this routine could be used to obtain the axial projection
   from a sphere to a cylinder about the z-axis that contains
   the equator of the sphere.  The following code fragment
   illustrates this idea.

         latcyl_c ( radius,  lon, lat, &r,  &lon, &z );
         r = radius;

   r,  lon, and z now contain the coordinates of the projected
   point. Such a projection is valuable because it preserves the
   areas between regions on the sphere and their projections to the
   cylinder.

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   E.D. Wright     (JPL)
   W.L. Taber      (JPL)

Version

   -CSPICE Version 1.0.1, 26-JUL-2016 (BVS)

      Minor headers edits.

   -CSPICE Version 1.0.0, 08-FEB-1998 (EDW)

Index_Entries

   latitudinal to cylindrical coordinates
Wed Apr  5 17:54:38 2017