Owner: CharacterisationDM
It contains the following operations:
It contains the following associations:
It contains the following attributes:
- name
- dim : Axis dimension : 2 for spatial , 1 for time, spectral , redshift, etc.
- numbins
- independent : This flag is set to FALSE if the axis depends on another physical axis.
For examples flux axis in an image depends on the spatial and spectral axis and in not independent.
- calibStatus : Encodes the calibration status along any axis. For the spatial axis (astrometry).
Some observations only provide the raw pointing position (uncalibrated).
Some other may have a raw linear relationship between the pixel coordinates and the world coordinates (RAW).
Some other are really accuratly calibrated..Possible values will be {} cf charac
Describes the type of calibration operated on the Observable axis a special case of which is the Flux axis).
Values must be in the following set , according to the Characterisation DM.:{}
This fully conditions what the user will be able to do with the retrieved data and therefore is crucial.
- undersampling
- regularsampling
- ucd : This parameter specifies the physical quantity attached to this axis. It allows to distinguish position in sky from
spatial frequencies (for u,v data), for instance , or frequency from wavelength along the spectral axis..
- unit
- coordSys
This method allows to compute the World coordinates of the observed values along each axis. It provides RA,DEC positions along the SpatialAxis, Wavelength along the Spectral axis, etc...