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FITS Keywords
The FITS format supports World Coordinate System ("WCS") calibrations that relate column, row positions to standard coordinate systems or physical dimensions. The FITS WCS is supported by all Mira version 7 platforms. The FITS WCS standard evolved from a number of different calibration schemes developed at various research facilities and institutions around the world. These schemes use different keywords and interpretations to describe the image calibration. As a result, there are a large number of keywords that must be supported in order to support all "WCS enabled" images created during the last ~30 years. Mira supports all of the protocols described by the WCS Extension to the FITS Standard.
Mira recognizes all of the various WCS protocols through the keywords in the table below. Some keywords use a numeric suffix to constitute a series, such as 20 keywords within the AMDX1 — AMDX20 series, or a 6x6 matrix of keywords within the PC001001 — PC006006 series. These are listed using ... between the series limits.
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CTYPE1 CTYPE2 CRVAL1 CRVAL2 CDELT1 CDELT2 CRPIX1 CRPIX2 CROTA1 CROTA2 |
IMWCS CD1_1 CD1_2 CD2_1 CD2_2 WRA RA WDEC DEC EPOCH |
WEPOCH MJD-OBS EQUINOX WEQUINOX RADECSYS SECPIX SECPIX1 SECPIX2 LONGPOLE LATPOLE |
WCS_DSS RA---DSS DEC--DSS PLTRAH PLTRAM PLTRAS PLTDECSN PLTDECD PLTDECM PLTDECS |
CNPIX1 CNPIX2 PIXSCALE PIXSCAL1 PIXSCAL2 PLTSCALE XPIXELSZ YPIXELSZ PROJR0 |
PROJP1 ... PROJP10 PPO1 ... PPO6 AMDX1 ... AMDX20 AMDY1 ... AMDY20 CO1_1 ... CO1_13 CO2_1 ... CO2_13 PC001001 ... PC006006 |