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The WMAP is the primary image and requires the standard image
keywords. Downstream software will likely require both the primary
and the secondary (WCSTY#P='PHYSICAL') WCS keywords.
- OPTIC1 - the X-coordinate position of the optical axis in
detector coordinates.
- OPTIC2 - the Y-coordinate position of the optical axis in
detector coordinates.
- WMREBIN - the rebinning factor from detector pixels to WMAP bins
(this should be the single axis binning factor eg a
binning factor of 4 puts 16 detector pixels into each
WMAP bin).
- CDELT1 - the X-axis increment for each WMAP bin in detector
units.
- DDELT1 - the original X-axis increment
- CDELT2 - the Y-axis increment for each WMAP bin in detector
units.
- DDELT2 - the original Y-axis increment
- CRVAL1 - the coordinate position of the X-axis reference pixel.
- CRVAL2 - the coordinate position of the Y-axis reference pixel.
- CRPIX1 - the X-axis reference pixel.
- DRPIX1 - the original X-axis reference pixel
- CRPIX2 - the Y-axis reference pixel.
- DRPIX2 - the original Y-axis reference pixel
- CTYPE1 - the name of the X-axis in the WMAP.
- CTYPE2 - the name of the Y-axis in the WMAP.
- CUNIT1 - the unit for the X-axis in the WMAP.
- CUNIT2 - the unit for the Y-axis in the WMAP.
- WCSTY1P- PHYSICAL
- WCSTY2P- PHYSICAL
- CTYE1P - Source of X-axis.
- CTYE2P - Source of Y-axis.
- CRPIX1P- X-axis reference pixel.
- CRPIX2P- Y-axis reference pixel.
- CRVAL1P- Coordinate of X-axis reference pixel in original image.
- CRVAL2P- Coordinate of Y-axis reference pixel in original image.
- CDELT1P- X-axis increment
- CDELT2P- Y-axis increment
- BLANK - the null value used in the WMAP to indicate a bin
outside the selected region (usually -1).
It should also include the standard OGIP keywords :
HDUCLASS= 'OGIP ' / Format conforms to OGIP/GSFC conventions
HDUCLAS1= 'IMAGE ' / Extension contains an image
HDUCLAS2= 'WMAP ' / Extension contains a weighted map
HDUVERS = '2.0.0 ' / Header version
HDUDOC = 'OGIP/96-001' / OGIP memo describing format
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