void spkw12_c ( SpiceInt handle,
SpiceInt body,
SpiceInt center,
ConstSpiceChar * frame,
SpiceDouble first,
SpiceDouble last,
ConstSpiceChar * segid,
SpiceInt degree,
SpiceInt n,
ConstSpiceDouble states[][6],
SpiceDouble epoch0,
SpiceDouble step )
Write a type 12 segment to an SPK file.
NAIF_IDS
SPC
SPK
TIME
EPHEMERIS
FILES
Variable I/O Description
-------- --- --------------------------------------------------
handle I Handle of an SPK file open for writing.
body I NAIF code for an ephemeris object.
center I NAIF code for center of motion of body.
frame I Reference frame name.
first I Start time of interval covered by segment.
last I End time of interval covered by segment.
segid I Segment identifier.
degree I Degree of interpolating polynomials.
n I Number of states.
states I Array of states.
epoch0 I Epoch of first state in states array.
step I Time step separating epochs of states.
MAXDEG P Maximum allowed degree of interpolating polynomial.
handle is the file handle of an SPK file that has been
opened for writing.
body is the NAIF integer code for an ephemeris object
whose state relative to another body is described
by the segment to be created.
center is the NAIF integer code for the center of motion
of the object identified by body.
frame is the NAIF name for a reference frame
relative to which the state information for body
is specified.
first,
last are, respectively, the start and stop times of
the time interval over which the segment defines
the state of body.
segid is the segment identifier. An SPK segment
identifier may contain up to 40 characters.
degree is the degree of the Hermite polynomials used to
interpolate the states. All components of the
state vectors are interpolated by polynomials of
fixed degree.
n is the number of states in the input state vector
array.
states contains a time-ordered array of geometric states
( x, y, z, dx/dt, dy/dt, dz/dt, in kilometers and
kilometers per second ) of body relative to center,
specified relative to frame.
epoch0 is the epoch corresponding to the first state in
the state array. Because extra states are needed
at the beginning and end of the segment in order
for the interpolation method to work, epoch0 will
normally precede first.
step is the time step separating the epochs of adjacent
states in the input state array. step is specified
in seconds.
None. See $Particulars for a description of the effect of this
routine.
MAXDEG is the maximum allowed degree of the interpolating
polynomial. If the value of MAXDEG is increased,
the SPICELIB routine SPKPVN must be changed
accordingly. In particular, the size of the
record passed to SPKRnn and SPKEnn must be
increased, and comments describing the record size
must be changed.
If any of the following exceptions occur, this routine will return
without creating a new segment.
1) If frame is not a recognized name, the error
SPICE(INVALIDREFFRAME) is signaled.
2) If the last non-blank character of segid occurs past index 40,
the error SPICE(SEGIDTOOLONG) is signaled.
3) If segid contains any nonprintable characters, the error
SPICE(NONPRINTABLECHARS) is signaled.
4) If degree is not at least 1 or is greater than MAXDEG, the
error SPICE(INVALIDDEGREE) is signaled.
5) If degree is not odd, the error SPICE(INVALIDDEGREE) is
signaled.
6) If the number of states n is not at least (degree+1)/2,
the error SPICE(TOOFEWSTATES) will be signaled.
7) If first is greater than or equal to last then the error
SPICE(BADDESCRTIMES) will be signaled.
8) If step is non-positive, the error SPICE(INVALIDSTEPSIZE) will
be signaled.
9) If the first epoch epoch0 is greater than first, the error
SPICE(BADDESCRTIMES) will be signaled.
10) If the last epoch
first + (n-1)*step
is less than last, the error SPICE(BADDESCRTIMES) will be
signaled.
11) If either the input frame or segment ID string pointer is null,
the error SPICE(NULLPOINTER) is signaled.
12) If either the input frame or segment ID string is empty,
the error SPICE(EMPTYSTRING) is signaled.
A new type 12 SPK segment is written to the SPK file attached
to HANDLE.
This routine writes an SPK type 12 data segment to the open SPK
file according to the format described in the type 12 section of
the SPK Required Reading. The SPK file must have been opened with
write access.
Suppose that you have states and are prepared to produce
a segment of type 12 in an SPK file.
The following code fragment could be used to add the new segment
to a previously opened SPK file attached to handle. The file must
have been opened with write access.
#include "SpiceUsr.h"
.
.
.
/.
Create a segment identifier.
./
#define SEGID "MY_SAMPLE_SPK_TYPE_12_SEGMENT"
/.
Write the segment.
./
spkw12_c ( handle, body, center, frame,
first, last, segid, degree,
n, states, epoch0, step );
None.
None.
N.J. Bachman (JPL)
-CSPICE Version 1.0.0, 23-FEB-2000 (NJB)
write spk type_12 ephemeris data segment
Link to routine spkw12_c source file spkw12_c.c
|