Re: missing value problem

From: Mary Haley (haley AT ucar.edu)
Date: Wed Aug 31 2005 - 16:01:00 MDT

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On Wed, 31 Aug 2005, Chao Luo wrote:

> Hi,
>
> I have some trouble for the missing value. First I setup missing value
> to 1.e36 in the two dimensional array of soil moisture. When I reorder
> the latitude and longitude with
>
> mss_val_out=1.e36
> mss_cnc_H2O@missing_value=mss_val_out
> vwc_sfc(0,:,:)=mss_cnc_H2O(::-1,:)
> vwc_sfc=lonFlip(vwc_sfc)
>
> the missing value of vwc_sfc change to 9999 (don't know why). I want to
> keep missing vale of vwc_sfc as 1.e36. How to do it?
>
> Thanks much for any help offered!
>
> Chao
>

Hi Chao,

NCL unfortunately does not recognize "missing_value" as a missing
value. Rather, you need to use the "_FillValue" attribute:

mss_cnc_H2O@_FillValue = mss_val_out

There's a short discussion on missing values in NCL, and how to deal
with cases where your file has "missing_value" as the missing value
attribute. Please see:

http://www.ncl.ucar.edu/Document/Language/fillval.shtml

--Mary

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