== FITS Keywords ==


||Category B ||Version 3.0.1 ||

[[process_fits]] reads the following keywords and sets the variable.

|| FITS Keyword || SPC Variable || Description ||
|| BITPIX || BITPIX || This sets the flag in SPC for how many bits to treat the data.  Everything is eventually converted into unsigned integer.  For ORex, this is 16.  The camera is a 14-bit imager, but the SPOC will pad the leading bits to 0 to make it a simple unsigned 16-bit integer.  IF a LUT (look-up-table) is used, the SPOC will convert the 8-bit LUT into the standard 16-bit integers||
||DATE_OBS || UTC0 || The UTC time of the observation.  This is converted within SPC via SPICE into ET, setting both ET0 and ET.||
|| EXPTIME || EXP || The duration of the exposure.  It is used to calculate the midpoint of the exposure.  This is _____ used for OREx.||
|| SCLK_STR || CLK0 and CKLUSE || This is the spacecraft clock.  If this value is set in the FITS headers, it is the primary time used to calculate the midpoint of the exposure.||
|| NAXIS1 ||  NPX ||
||NAXIS2 ||NLN||||
||CAMERAID ||CAM||||
||MTR_POS ||FLT||||
||LUT ||LUT||||
|| MCFWHTMP || NTX (1,1) || MapCam temperature.  The final algorithm has not been decided yet.  However, the weighting of each temperature can be adjusted in the file [[DN2TEMP.TXT]].  This assumes a linear mixing of the four camera temperatures.||
||MCFWMTMP || NTX (1,2) || see above ||
||MCLENTMP || NTX (1,3) || see above ||
||MCROETMP || NTX (1,4)|| see above ||
||SCFWHTMP || NTX (2,1) || SamCam temperature.  The final algorithm has not been decided yet.  However, the weighting of each temperature can be adjusted in the file [[DN2TEMP.TXT]].  This assumes a linear mixing of the four camera temperatures.||
||SCFWMTMP || NTX (2,2)|| see above ||
||SCLENTMP || NTX (2,3)|| see above ||
||SCROETMP || NTX (2,4)|| see above ||
||PCFWHTMP || NTX (3,1) || PolyCam temperature.  The final algorithm has not been decided yet.  However, the weighting of each temperature can be adjusted in the file [[DN2TEMP.TXT]].  This assumes a linear mixing of the four camera temperatures.||
|| PCFWMTMP || NTX (3,2) || see above ||
|| PCLENTMP || NTX (3,3) || see above ||
|| PCROETMP || NTX (3,4)|| see above ||
|| NCCHTEMP || NTX (4,0) and NTX (4,1) || NavCam temperature ||
|| TCCHTEMP || NTX (5,0) and NTX (5,1) || TAGCam temperature ||
||SC_QA || QT(0) || Quadterians.  OREx will write the spacecraft pointing information, as of when the image was taken, into the FITS header.  [[process_fits]] will output them in the file [[quaternions.txt]] in the format PICNM, QT(I), I=0,3||
|| SC_QX || QT(1)|| see above ||
|| SC_QY || QT(2)|| see above ||
|| SC_QZ || QT(3)|| see above ||
|| BZERO || DDN and SIGNED || FORTRAN reads all integers as signed.  If the data should be unsigned, then the DN values less than zero are converted into high-bit values.||
|| INSTRUME || INAME and NC || This is the name of the instrument in human-readable form.  It sets the variable NC as follows:||
    || INSTRUME || NC ||
    || MAP || 1 ||
    || SAM || 2 ||
    || POL || 3 ||
    || NCM || 4 ||
    || NFT || 5 ||
The order of this is important because the camera number is the reference that SPC uses for camera ID within the configuration files [[make_sumfiles.txt], [[DN2TEMP]], and [[FLATFIELD.TXT]]