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Re: Thanks

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  • Subject: Re: Thanks
  • Date: Thu, 08 Nov 2001 22:16:35 -0700
>To: address@hidden
>From: "M.R.SRIDHAR" <address@hidden>
>Subject: Re: 20011108: Re: request
>Keywords: missing values

Sridhar,

> thanks for your immidiate reply..i have already defined lat,lon and sealevel 
> as
> same datatypes...and also defined
> attributes for missing value as same as sealevel datatypes.But when i 
> visualised
> in ferret its giving the junk picture again.i would like know whether After 
> the
> conversion into .nc dataformat it contains the missiinvalues 9999 or not.let 
> me
> know.anticipating your reply.

If you run the "ncdump" program on your .nc file, it will display
missing values as "_" for values that match the "_FillValue"
attribute, instead of displaying the "9999" value.  If you see data
values displayed as "9999" instead of "_", that indicates you have not
defined the attribute correctly.  It must be named "_FillValue"
(note leading underscore and case are important), and its type should
match the type of the variable.

The "Ferret" program is supported and maintained by its developers at
NOAA PMEL.  If it is not recognizing and properly handling your
missing values, you will have to consult with PMEL or the Ferret
documentation to find out why.  We developed and support netCDF, but
don't have much expertise in the use of Ferret.

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu