Manpage of impos
Section: User Commands (1)
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impos - Converts image coordinates between different systems.
IMPOS takes a coordinate in a specified system (such
as "abspix" or "arcsec") and converts it to all appropriate
coordinate systems (absolute world, offset world, pixels,
offset pixels). Spectral axes are converted to values in
frequency, radio and optical velocities.
If the input is an image and the specified coordinate represents
a valid pixel, its value is reported as well.
The input image or visibility dataset. For a visibility dataset,
the coordinate system is relative to the first visibility
Specify the coordinate for each axis that you are interested
in; you don't necessarily need one for every axis in the image.
Specify the coordinate system of the input coordinate for each
axis. Different axes can be in different systems. Choose from:
"hms" HH:MM:SS.S (e.g. for RA)
"dms" DD:MM:SS.S (e.g. for DEC)
"arcsec" Arcseconds relative to the reference pixel
"absdeg" Absolute degrees
"reldeg" Degrees relative to the reference pixel
"relpix" Pixels relative to the reference pixel
"relghz" GHz relative to the reference pixel
"relkms" km/s relative to the reference pixel
"abslin" Linear coordinate
"rellin" Linear coordinate relative to the reference pixel
The default is "abspix".
coordinate, this indicates what convention it is in. For example,
you might give an optical velocity with "type=abskms", but the header
indicates a frequency axis. If unset, it is assumed the coordinate
is in the convention defined by the image header.
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Time: 18:35:38 GMT, July 05, 2011