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missing values not ignored
Folks,
I have a netCDF file containing 3-d model output. I have stored the
variables as short integers using the scale_factor and add_offset
attributes.
One particular variable is:
short bfdet(T, Yt, Xt) ;
bfdet:valid_range = -1000.f, 0.f ;
bfdet:scale_factor = 0.01525925f ;
bfdet:add_offset = -500.f ;
bfdet:_FillValue = -32768s ;
bfdet:missing_value = -32768s ;
bfdet:units = "mg C/m2/d " ;
bfdet:long_name = "average bottom flux detritus" ;
When I list this variable at some longitude I get a correct representation
of the missing values (land):
yes? list/x=140w bfdet
(snip)
74.23S / 21: -0.671
74.47S / 20: -0.275
74.7S / 19: -0.244
74.93S / 18: -0.107
75.16S / 17: -0.076
75.39S / 16: -0.015
75.61S / 15: ....
75.83S / 14: ....
76.04S / 13: ....
76.26S / 12: ....
76.47S / 11: ....
76.67S / 10: ....
etc
However, when I 'shade bfdet' the missing values are shaded instead of
being ignored. This doesn't happen w/ every variable, in most cases it
works fine. It seems to happen only w/ variables w/ large negative
offsets.
Can anyone explain this?
Thanks,
Denise.
=====================================================================
Denise L. Worthen, SSAI
Oceans and Ice Branch/Code 971
NASA Goddard Space Flight Center
Greenbelt MD 20771
dlw@weka.gsfc.nasa.gov
(301) 286-2339
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