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Description:
An
imaginary pixel is centred on the supplied interpolation position. The area of the overlap between this
imaginary pixel and each of the four surrounding real pixels is found, and used as the weight for the
corresponding pixel value. The returned interpolated value is the weighted mean of the four
surrounding pixel values. A bad value is returned if any of these four pixels lie outside the image or
have a bad value.
The associated variance value is also returned if input variances are supplied.
Invocation
CALL KPG1_BILNR( X, Y, XLO, XHI, YLO, YHI, USEVAR, DATA, VAR, INTERP, INTERV,
STATUS )
Arguments
X = REAL (Given)
The pixel X co-ordinate at which to perform
the interpolation.
Y = REAL (Given)
The pixel Y co-ordinate at which to perform the
interpolation.
XLO = INTEGER (Given)
The lower bound on the array X axis.
XHI = INTEGER
(Given)
The upper bound on the array X axis.
YLO = INTEGER (Given)
The lower
bound on the array Y axis.
YHI = INTEGER (Given)
The upper bound on the array Y
axis.
USEVAR = LOGICAL (Given)
Should a variance be returned?
DATA( XLO:XHI,
YLO:YHI ) = REAL (Given)
The data array to be interpolated.
VAR( XLO:XHI, YLO:YHI
) = REAL (Given)
The variance array (only accessed if USEVAR is .TRUE.).
INTERP
= REAL (Returned)
The interpolated data value.
INTERV = REAL (Returned)
The
interpolated variance value.
STATUS = INTEGER (Given and Returned)
The global status.
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