Problem with fwrite

[Davide Sacchetti]

I don't know ...
my suggestions are:
      * use gxout shaded (it helps understanding location of missing
        data - that's the wrong land sea mask)
      * when grads writes down (display with gxout fwrite) check number
        of elements with Nx * Ny
      * put 'set lon ... lat ... z' out of the loop, tying inside the
        loop does not help
      * when you obtain the output file check the file size by
        Nx*Ny*Nt*4
      * if any of these check fails try to understand where it fails. In
        my experience, using high resolutions, fwrite may fail the
        correct number of X, or Y, or may fail the X,Y start point; it's
        really unusual the failure with 1 deg resolution.

p.s.: the correct_fig was missing ...
bye bye

davide

On Sat, 2009-09-12 at 23:22 +0800, Hyacinth Cyprain Nnamchi wrote:
> Dear GrADS Users,
>
> I am trying to write out SST data from the Hadley Centre dataset at 1*1-degree lon/lat grids for the oceans using the code in  .gs file:
>
> tt=1
> while(tt<=684)
> 'set  z  1'
> 'set  lon -60 20'
> 'set  lat  -45 5'
> 'set t ' tt
> 'd   sst'
> tt=tt+1
> endwhile
> 'reinit'
>
> This works when I print the data on the screen as in the "Correct_Fig.JPG" (attached herewith) for the 684 timesteps.The problem is: When I use fwrite to write out the data and then read with ctl file, it produces the "Wrong_Fig.JPG" (Fig attached is for the first timestep.This error occurs in all the timesteps).
>
> The CTL info below is the same with that of the parent data except in respect to the start lon/lat and the numbers of lon/lat:
> UNDEF      -1e+30
> XDEF       81    LINEAR    -60    1
> YDEF        51    LINEAR   -45     1
> ZDEF        1     LINEAR     0          1
> TDEF       684   LINEAR  JAN1950        1mo
> VARS        1
> sst    0    99    global monthly SSTs at 1 by 1 resolution from the Hadley Centre
> ENDVARS
>
>
> Can anyone help with some ideas on how to get around this?
> Thanks in advance.
>
> hyacinth
> MS Windows GrADS 2.0.a5.oga.5
>
>
>
>
>
>
>
> --
--
Sacchetti Davide
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione Liguria
ARPAL Unità Tecnica Complessa di livello Regionale
V.le Brigare Partigiane 2 16121 Genova (I)
tel: +39 010 6437535                    fax: +39 010 6437520
mail: davide.sacchetti at arpal.org     web: www.meteoliguria.it