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NatLat
-
Native latitude of the reference point of a FITS-WCS projection
- Description:
This attribute gives the latitude of the reference point of the
FITS-WCS projection implemented by a WcsMap. The value is in
radians in the "native spherical" coordinate system. In some
cases, this latitude value may be determined by one or more
projection parameter values supplied for the WcsMap using its
PVj_m attribute.
- Type:
- Floating point, read-only.
- Class Applicability:
-
WcsMap
-
All WcsMaps have this attribute.
- Notes:
-
A value of AST__BAD is returned if no latitude value is
available.
-
For a definition of the reference point for a projection, see
the FITS-WCS paper.
Next: Naxes - Number of Frame axes
Up: AST Attribute Descriptions
Previous: MinTickLen(axis) - Length of minor tick marks for a Plot
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
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