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NegLon - Display negative longitude values?

Description:
This attribute is a boolean value which controls how longitude values are normalized for display by AST_NORM.

If the NegLon attribute is zero, then normalized longitude values will be in the range zero to 2.pi. If NegLon is non-zero, then normalized longitude values will be in the range -pi to pi.

The default value depends on the current value of the SkyRefIs attribute, If SkyRefIs has a value of "Origin", then the default for NegLon is one, otherwise the default is zero.

Type:
Integer (boolean).
Class Applicability:
SkyFrame
All SkyFrames have this attribute.


next up previous 264
Next: Negated - Region negation flag
Up: AST Attribute Descriptions
Previous: Ncolumn - The number of columns in the table

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council