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sphcyl_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 sphcyl_c ( SpiceDouble     radius,
                   SpiceDouble     colat,
                   SpiceDouble     slon,
                   SpiceDouble   * r,
                   SpiceDouble   * lon,
                   SpiceDouble   * z ) 

Abstract

 
    This routine converts from spherical coordinates to cylindrical 
    coordinates. 
 

Required_Reading

 
   None. 
 

Keywords

 
   CONVERSION,  COORDINATES 
 

Brief_I/O

 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  ------------------------------------------------- 
   radius     I   Distance of point from origin. 
   colat      I   Polar angle (co-latitude in radians) of point. 
   slon       I   Azimuthal angle (longitude) of point (radians). 
   r          O   Distance of point from Z axis. 
   lon        O   angle (radians) of point from XZ plane. 
   z          O   Height of point above XY plane. 
 

Detailed_Input

 
   radius     Distance of the point from origin. 
 
   colat      Polar angle (co-latitude in radians) of the point. 
 
   slon       Azimuthal angle (longitude) of the point (radians). 
 

Detailed_Output

 
   r          Distance of the point of interest from Z axis. 
 
   lon        cylindrical angle (radians) of the point from the 
              XZ plane. `lon' is set equal to `slon'. 
 
   z          Height of the point above XY plane. 
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   This returns the cylindrical coordinates of a point whose 
   position is input through spherical coordinates. 
 

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. 
 
         sphcyl_c ( radius, colat,  lon, 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

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

 
   spherical to cylindrical coordinates 
 
Wed Apr  5 17:54:43 2017