Tech Note: FITS WCS Keywords Recognized by Mira Version 7

Copyright © 2006. Mirametrics, Inc. All Rights Reserved.


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 AMDX1AMDX20 series, or a 6x6 matrix of keywords within the PC001001PC006006 series. These are listed using ... between the series limits.

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

 


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