pckw02_c |

Table of contents## Procedurepckw02_c ( PCK, write type 2 segment ) void pckw02_c ( SpiceInt handle, SpiceInt clssid, ConstSpiceChar * frame, SpiceDouble first, SpiceDouble last, ConstSpiceChar * segid, SpiceDouble intlen, SpiceInt n, SpiceInt polydg, SpiceDouble cdata [], SpiceDouble btime ) ## AbstractWrite a type 2 segment to a PCK binary file given the file handle, frame class ID, base frame, time range covered by the segment, and the Chebyshev polynomial coefficients. ## Required_ReadingDAF FRAMES NAIF_IDS PCK SPC ## KeywordsPCK ## Brief_I/OVARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- handle I Handle of binary PCK file open for writing. clssid I Frame class ID of body-fixed frame. frame I Name of base reference frame. first I Start time of interval covered by segment. last I End time of interval covered by segment. segid I Segment identifier. intlen I Length of time covered by logical record. n I Number of logical records in segment. polydg I Chebyshev polynomial degree. cdata I Array of Chebyshev coefficients. btime I Begin time of first logical record. ## Detailed_Inputhandle is the DAF handle of an PCK file to which a type 2 segment is to be added. The PCK file must be open for writing. clssid is the frame class ID of a body-fixed reference frame whose orientation is described by the segment to be created. frame is the NAIF name for a reference frame relative to which the orientation information for the frame designated by `clssid' is specified. The frame designated by `frame' is called the "base frame." first, last are, respectively, the start and stop times of the time interval over which the segment defines the orientation of clssid. segid is the segment identifier. A PCK segment identifier may contain up to 40 characters. intlen Length of time, in seconds, covered by each set of Chebyshev polynomial coefficients (each logical record). Each set of Chebyshev coefficients must cover this fixed time interval, `intlen'. n is the number of sets of Chebyshev polynomial coefficients (number of logical records) to be stored in the segment. There is one set of Chebyshev coefficients for each time interval. polydg Degree of each set of Chebyshev polynomials. cdata Array containing all the sets of Chebyshev polynomial coefficients to be contained in the segment of the PCK file. The coefficients are stored in cdata in order as follows: the (degree + 1) coefficients for the first Euler angle of the first logical record the coefficients for the second Euler angle the coefficients for the third Euler angle the coefficients for the first Euler angle for the second logical record, ... and so on. btime Begin time (seconds past J2000 TDB) of first set of Chebyshev polynomial coefficients (first logical record). ## Detailed_OutputNone. ## ParametersNone. ## Exceptions1) If the number of sets of coefficients is not positive, the error SPICE(NUMCOEFFSNOTPOS) is signaled by a routine in the call tree of this routine. 2) If the interval length is not positive, the error SPICE(INTLENNOTPOS) is signaled by a routine in the call tree of this routine. 3) If the integer code for the reference frame is not recognized, the error SPICE(INVALIDREFFRAME) is signaled by a routine in the call tree of this routine. 4) If segment stop time is not greater then the begin time, the error SPICE(BADDESCRTIMES) is signaled by a routine in the call tree of this routine. 5) If the time of the first record is not greater than or equal to the descriptor begin time, the error SPICE(BADDESCRTIMES) is signaled by a routine in the call tree of this routine. 6) If the end time of the last record is not greater than or equal to the descriptor end time, the error SPICE(BADDESCRTIMES) is signaled by a routine in the call tree of this routine. 7) If any of the `frame' or `segid' input string pointers is null, the error SPICE(NULLPOINTER) is signaled. 8) If any of the `frame' or `segid' input strings has zero length, the error SPICE(EMPTYSTRING) is signaled. ## FilesA new type 2 PCK segment is written to the PCK file attached to HANDLE. ## ParticularsThis routine writes an PCK type 2 data segment to the designated PCK file, according to the format described in the PCK Required Reading. Each segment can contain data for only one body-fixed frame and base reference frame. The Chebyshev polynomial degree and length of time covered by each logical record are also fixed. However, an arbitrary number of logical records of Chebyshev polynomial coefficients can be written in each segment. Minimizing the number of segments in a PCK file will help optimize how the SPICE system accesses the file. ## ExamplesThe numerical results shown for this example may differ across platforms. The results depend on the SPICE kernels used as input, the compiler and supporting libraries, and the machine specific arithmetic implementation. 1) Suppose that you have sets of Chebyshev polynomial coefficients in an array pertaining to the orientation of the Moon body-fixed frame with the frame class ID 301 relative to the J2000 reference frame, and want to put these into a type 2 segment PCK file. The following example could be used to add one new type 2 segment. To add multiple segments, put the call to ## RestrictionsNone. ## Literature_ReferencesNone. ## Author_and_InstitutionN.J. Bachman (JPL) J. Diaz del Rio (ODC Space) K.S. Zukor (JPL) ## Version-CSPICE Version 1.0.1, 04-AUG-2021 (JDR) Edited the header to comply with NAIF standard. Added complete code examples based on existing fragment. -CSPICE Version 1.0.0, 16-DEC-2016 (NJB) (KSZ) ## Index_Entrieswrite PCK type_2 data segment |

Fri Dec 31 18:41:10 2021