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sphlat_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 sphlat_c ( SpiceDouble     r, 
                   SpiceDouble     colat, 
                   SpiceDouble     lons,
                   SpiceDouble   * radius,
                   SpiceDouble   * lon, 
                   SpiceDouble   * lat ) 

Abstract

 
   Convert from spherical coordinates to latitudinal coordinates. 
 

Required_Reading

 
   None. 
 

Keywords

 
   CONVERSION, COORDINATES 
 

Brief_I/O

 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   r          I   Distance of the point from the origin. 
   colat      I   Angle of the point from positive z axis (radians). 
   lons       I   Angle of the point from the XZ plane (radians). 
   radius     O   Distance of a point from the origin 
   lon        O   Angle of the point from the XZ plane in radians 
   lat        O   Angle of the point from the XY plane in radians 
 

Detailed_Input

 
   r          Distance of the point from the origin. 
 
   colat      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). 
  

Detailed_Output

 
   radius     Distance of a point from the origin 
 
   lon        Angle of the point from the XZ plane in radians. `lon'
              is set equal to `lons'.
 
   lat        Angle of the point from the XY plane in radians. `lat'
              is computed as pi/2 - `colat'.
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   This routine returns the latitudinal coordinates of a point 
   whose position is input in spherical 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

 
 
   Latitude is obtained by subtracting co-latitude from HALFPI() 
   Radius and longitude mean the same thing in both latitudinal 
   and spherical coordinates.  The table below lists lat and 
   corresponding colat in terms of degrees. 
 
           lat            colat 
          ------         ------ 
            0             90 
           20             70 
           45             45 
          -30            120 
           90              0 
          -45            135 
 

Restrictions

 
   None. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   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

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