Content-type: text/html Manpage of impos

impos

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NAME

impos - Converts image coordinates between different systems.  

PERSON RESPONSIBLE

nebk  

CATEGORIES

image analysis  

DESCRIPTION

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.  

PARAMETERS

in
The input image or visibility dataset. For a visibility dataset, the coordinate system is relative to the first visibility record.
coord
Specify the coordinate for each axis that you are interested in; you don't necessarily need one for every axis in the image. No default.
type
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
   "abspix"      Pixels 
   "relpix"      Pixels relative to the reference pixel
   "absghz"      GHz
   "relghz"      GHz relative to the reference pixel
   "abskms"      km/s
   "relkms"      km/s relative to the reference pixel
   "abslin"      Linear coordinate 
   "rellin"      Linear coordinate relative to the reference pixel

The default is "abspix".

stype
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.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011