Next: Warnings - Controls the issuing of warnings about various conditions
Up: AST Attribute Descriptions
Previous: TranInverse - Inverse transformation defined?
- Description:
This attribute contains a textual representation of the physical
units used to represent coordinate values on a particular axis
of a Frame. The AST_SETACTIVEUNIT routine controls how the Unit values
are used.
- Type:
- String.
- Class Applicability:
-
Frame
-
The default supplied by the Frame class is an empty string.
-
SkyFrame
-
The SkyFrame class re-defines the default Unit value (e.g. to
"hh:mm:ss.sss") to describe the character string returned by
the AST_FORMAT function when formatting coordinate values.
-
SpecFrame
-
The SpecFrame class re-defines the default Unit value so that it
is appropriate for the current System value. See the System
attribute for details.
-
FrameSet
-
The Unit attribute of a FrameSet axis is the same as that of
its current Frame (as specified by the Current attribute).
- Notes:
-
When specifying this attribute by name, it should be
subscripted with the number of the Frame axis to which it
applies.
Next: Warnings - Controls the issuing of warnings about various conditions
Up: AST Attribute Descriptions
Previous: TranInverse - Inverse transformation defined?
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2003 Central Laboratory of the Research Councils