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Ferret & CDF missing values
Dear Ferret users,
I have a fortran program that assigns special values to missing
data. I tell the CDF file about them via calls like
call NCAPT(CDFID,variable_id,'missing_value',NCDOUBLE,1,FVAL,IRET),
where FVAL = -99999.0. Just for good measure, I make a similar
assignment to _FillValue also. I know that the CDF file has taken
the information on board, since ncdump -h reports missing_value and
_FillValue correctly.
However, in Ferret v4.9, the missing values aren't recognized. For
example,
yes? stat z1
Method 1
X (mm): -7.6 to 7.6
Y (mm): -7.6 to 7.6
Z: 0.5 to 6.5
T: N/A
DATA SET: ./lens.cdf
Total # of data points: 60000 (100*100*6*1)
# flagged as bad data: 0
Minimum value: -99999
Maximum value: 1
I must admit that it's been a year or so since I've used Ferret,
but I swear it used to work! I can, of course, get around it using
set variable/bad, but that's non-transparent. It really ought to
be able to be set automatically through the CDF file, right?
Regards,
=================================================================
Simon Evans (simon@maths.unsw.edu.au)
Physical Oceanography Group
School of Mathematics, University of New South Wales, Australia.
=================================================================
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