error in ctl file

[Madhusoodanan M.S.]

Anushri,

your output (tauxobs.grd) should have 192*51*24*4 bytes (your grid size is
1degx1deg).

there could be errors in the .ctl file of tauxobs.grd.

cheers,
Madhu

2009/2/4 anushri dutta <anushridutta01 at gmail.com>

> Respected Sir,
> the command which I am using is the
>
> 'reinit'
> 'sdfopen taux.cdf'
> 'set gxout fwrite'
> 'set fwrite tauxobs.grd'
> 'set x 129.5 320.5'
> 'set y 121.5 171.5'
> 'set z 1'
> 'set t 1 24'
> 'd taux'
> 'disable fwrite'
>
> and the data length in tauxobs.grd is 193*52*24*4, where nx=193, ny=52, and
> t=24,
> so, where is the error in file i am not getting it, that is it display the
> variable for only time t=1, not for the other time,
> please help me.
>
> with redgards
>
> anushri
>
>
> On 2/4/09, Douglas Clark <dbcl at ceh.ac.uk> wrote:
>>
>> Anushri,
>>
>> It's difficult to know what the problem is unless you give more
>> information about how you created the file!
>>
>> There's potentially quite a lot of information that you need to provide,
>> but the following at least would be useful:
>> * the script or commands that you used to perform the fwrite, and what
>> GrADS output to the screen when you did this
>> * the ctl file you created for the output
>> * the results of the command "ncdump -h taux97-98.cdf" (if you have the
>> ncdump utility)
>>
>> In the meantime, is it possible that you only wrote out 1 time of the
>> netCDF file? How big is the file tauxobs.grd (e.g. ls -l in Unix)? If the
>> grid is of size nx*ny points, one year of monthly data should give a file of
>> size nx*ny*12*4 bytes. If your file is smaller, you haven't written all
>> times, so repeat the fwrite stage after 'set t 1 12' (or whatever is
>> appropriate). Try this first!
>>
>> Doug
>>
>>
>> >>> anushridutta01 at GMAIL.COM 04/02/2009 07:20 >>>
>> Dear Grads User,
>> Hi,
>> here I am facing a problem, that i want to write a binary data for
>> the 12 month by data taux97-98.cdf, through fwrite function,
>> but when I pot the data through ctl file,
>> it display for a single month, not for all the months,
>> and the error which it showing is
>>
>> ga-> open taux.ctl
>> Scanning description file:  taux.ctl
>> Data file tauxobs.grd is open as file 1
>> LON set to 64.5 160
>> LAT set to -15 10
>> LEV set to 1 1
>> Time values set: 1997:1:1:0 1997:1:1:0
>> ga-> set t 1
>> Time values set: 1997:1:1:0 1997:1:1:0
>> ga-> d taux
>> Contouring: -0.08 to 0.08 interval 0.02
>> ga-> set t 2
>> Time values set: 1997:2:1:0 1997:2:1:0
>> ga-> d taux
>> Low Level I/O Error:  Read error on data file
>> Data file name = tauxobs.grd
>> Error reading 192 bytes at location 313344
>> Data Request Error:  Error for variable 'taux'
>> Error ocurred at column 1
>> DISPLAY error:  Invalid expression
>> Expression = taux
>>
>>
>> same as for the 3 to 12 month,
>>
>> I am not understanding why it is so,
>> Please tell me, how do I achieve this,
>>
>> with regards
>>
>> anushri
>>
>>
>> --
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>
>
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