KPG1_PX2AX

Converts a pixel’ s indices into WCS or axis co-ordinates

Description:

This routine converts the pixel indices of an NDF pixel into the WCS co-ordinate values of the pixel’ s centre. If a WCS FrameSet is not available, then the pixel indices are converted into the axis co-ordinate system. If an axis co-ordinate system is not defined for the NDF, then the pixel co-ordinate system will be used instead.

Invocation

CALL KPG1_PX2AX( NDIM, PX, INDF, AX, STATUS )

Arguments

NDIM = INTEGER (Given)
Number of NDF dimensions.
PX( NDIM ) = INTEGER (Given)
Indices of the NDF’ s pixel.
INDF = INTEGER (Given)
NDF identifier.
AX( ∗ ) = DOUBLE PRECISION (Returned)
WCS or axis co-ordinate values for the pixel’ s centre. There should be enough elements in this array for all the current frame WCS axes (which need not be the same as NDIM).
STATUS = INTEGER (Given and Returned)
The global status.

Notes:

This routine is simplified by handling only a single pixel. It will not be efficient enough to handle arrays of pixels.