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Retrieve frame ID code and name to associate with an object.
None.
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- cname I Name of the object to find a frame for. lenout I Maximum length available for frame name. frcode O The ID code of the frame associated with cname. frname O The name of the frame with ID frcode. found O SPICETRUE if the requested information is available.
cname is the name for object for which there is a preferred reference frame. lenout is the amount of space available, counting the space required for the terminating null character, in the output string frname. Normally lenout is the declared length of frname.
frcode is the frame id-code to associate with a the object specified by cname. frname is the name of the frame that should be associated with the object specified by cname. found is SPICETRUE if the appropriate frame id-code and frame name can be determined. Otherwise found is returned with the value SPICEFALSE.
None.
This routine allows the caller to determine the frame that should be associated with a particular object. For example, if you need the frame to associate with the Io, you can call cnmfrm_c to determine the frame name and id-code for the bodyfixed frame of Io. The preferred frame to use with an object is specified via one of the kernel pool variables: OBJECT_<cname>_FRAME where <cname> is the non-blank portion of the string CNAME. For those PCK objects that have "built-in" frame names this routine returns the corresponding "IAU" frame and frame ID code.
Suppose that you want to determine the state of a target in the preferred reference frame of some observer. This routine can be used in conjunction with spkezr_c to compute the state. #include <stdio.h> #include <stdlib.h> #include "SpiceUsr.h" . . . #define LENOUT 80 cnmfrm_c ( obsnam, LENOUT, &frcode, frname, &found ); if ( !found ) { printf ( "The bodyfixed frame for object %s " "could not be identified.\n", obsnam ); exit(1); } spkezr_c ( target, et, frname, abcorr, obsnam, state, < );
None.
1) If either cname or frname is a null pointer, the error SPICE(NULLPOINTER) will be signaled. 2) If cname has length zero, the error SPICE(EMPTYSTRING) will be signaled. 3) If lenout is less than 1, the error SPICE(STRINGTOOSHORT) will be signaled. 4) If the output string is too short to contain the frame name, the result is truncated on the right. The output string is still null-terminated.
None.
N.J. Bachman (JPL) W.L. Taber (JPL)
None.
-CSPICE Version 1.0.0, 25-JUN-1999 (NJB) (WLT)
Fetch reference frame attributes