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Description:
The
routine obtains information about the world coordinate systems associated with an NDF and returns
an AST pointer to a
FrameSet which contains this information. The information may then be accessed
using routines from the AST library (
SUN/210).
Invocation
CALL NDF_GTWCS( INDF, IWCS, STATUS
)
Arguments
INDF = INTEGER (Given)
NDF identifier.
IWCS = INTEGER (Returned)
An AST
pointer to a FrameSet which contains information about the world coordinate systems associated
with the NDF.
STATUS = INTEGER (Given and Returned)
The global status.
Notes:
-
It is the caller’
s responsibility to annul the AST pointer issued by this routine (e.g. by calling
AST_ANNUL) when it is no longer required. The NDF_ system will not perform this task
itself.
-
If this routine is called with STATUS set, then a value of AST__NULL will be returned for the IWCS
argument, although no further processing will occur. The same value will also be returned if the
routine should fail for any reason. The AST__NULL constant is defined in the include file AST_PAR.
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