[gradsusr] ERA-40 NC template

Ricardo Hallak hallak at model.iag.usp.br
Mon Feb 13 22:36:29 EST 2012


Hi Jose, how are you?

In your .ctl:
tdef says you have monthly data (36 time steps, 1mo increment).
dset says you have annual data (only %y4). 
So, if you have annual files, the time increment must be 1yr. On the other
hand, if you have monthly files, dset must be "data_%y4%m2.nc".

Saudações,
Hallak


On Mon, 13 Feb 2012 22:31:51 -0200, Jose Augusto Paixão Veiga wrote
> Dear users,
> 
> I have downloaded several data from ERA-40 in netcdf format and I 
> would like to read them into one CTL file with the command template 
> (bellow).
> 
> dset ^data_%y4.nc
> title ECMWF ERA-40 2.5 x 2.5 
> undef -9.99e+33
> options template
> dtype netcdf
> xdef 144 linear   0.0 2.5
> ydef  73 linear -90.0 2.5
> zdef 13 levels 1000 925 850 775 700 600 500 400 300 250 200 150 100
> tdef 36 linear 00Z01JAN1979 1mo
> vars  5
> t=>t  13  t,z,y,x  Temperature
> u=>u  13  t,z,y,x  U velocity
> v=>v  13  t,z,y,x  V velocity
> w=>w  13  t,z,y,x  Vertical velocity
> z=>z  13  t,z,y,x  Geopotential
> endvars
> 
> However, when I display the variable uwnd (or other one) the map 
> shows another field (field.gif), differently from the original one 
> (original.gif)
> 
> What could be the problem with this CTL template?
> 
> Thanks in advance.
> 
> José Augusto P. Veiga,
> 
> ======================================
> Universidade do Estado do Amazonas 
> Departamento de Meteorologia
> Escola Superior de Tecnologia (EST)
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