Applies a translational correction to the WCS in an NDF
"Absolute"
. Offsets for celestial longitude and latitude axes should be
specified in arcseconds. Offsets for all other types of axes should be given
directly in the units of the axis. "Relative"
. "Relative"
. "Relative"
or "Absolute"
. ["Absolute"]
The correction is affected by translating pixel co-ordinates by a constant amount before
projection them into WCS co-ordinates. Therefore, whilst the translation will be constant across
the array in pixel co-ordinates, it may vary in WCS co-ordinates depending on the nature of
the pixel→WCS
transformation. The size of the translation in pixel co-ordinates is chosen in order to
produce the required shift in WCS co-ordinates at the OBJ position (if STYPE is
"Relative"
), or at the array centre (if STYPE is "Absolute"
).
There can be an arbitrary number of NDF dimensions.