[gradsusr] help - NetCDF file

[James T. Potemra]

Celso:

Your descriptor file lists four times (months), but it is specifically 
reading only one file (amazonia.clm2.h0.2002-01-01-00000.nc).  You 
likely want to read all four, so you'll have to add an option 
"template".  Also, it's not clear from the file names if they reference 
month-day or day-month, e.g., is amazonia.clm2.h0.2002-01-04-00000.nc 
for January 4, 2002 or April 1, 2002?  In your descriptor file you 
specify the time increment as monthly (1mo).  If the files have single 
time values (one monthly value), and the format of the file name is 
day-month, your DSET line should be something like:

DSET ^amazonia.clm2.h0.2002-01-%m2-00000.nc

The %m2 indicating a substitution template of 2-digit month.

Jim

On 7/10/13 3:58 PM, Celso Bandeira de Melo Ribeiro wrote:
> Hi Matt,
>
> Thank you very much for your attention and help.
> Worked perfectly I created the following file:
>
> DSET ^amazonia.clm2.h0.2002-01-01-00000.nc
> OPTIONS 365_day_calendar
> tdef time 4 linear 01jan2000 1mo
>
> I am working with 4 files (Daily), whose names are:
>
> amazonia.clm2.h0.2002-01-01-00000.nc
> amazonia.clm2.h0.2002-01-02-00000.nc
> amazonia.clm2.h0.2002-01-03-00000.nc
> amazonia.clm2.h0.2002-01-04-00000.nc
>
> The file opens perfectly in GrADS:
>
> ga-> xdfopen amazonia.ctl
> Scanning Descriptor File:  amazonia.ctl
> SDF file amazonia.clm2.h0.2002-01-01-00000.nc is open as file 1
> LON set to 279.062 311.875
> LAT set to -20.2999 6.45372
> LEV set to 0.00710064 0.00710064
> Time values set: 2000:1:1:0 2000:1:1:0
> E set to 1 1
> ga-> q file
> File 1 : CLM History file information
>    Descriptor: amazonia.ctl
>    Binary: amazonia.clm2.h0.2002-01-01-00000.nc
>    Type = Gridded
>    Xsize = 106  Ysize = 115  Zsize = 15  Tsize = 4  Esize = 1
>    Number of Variables = 175
>      ...
>       tsoi  15  t,z,y,x  soil temperature
>       tsoi_10cm  0  t,y,x  soil temperature in top 10cm of soil
>       tv  0  t,y,x  vegetation temperature
>       u10  0  t,y,x  10-m wind
>       urban_ac  0  t,y,x  urban air conditioning flux
>   ...
>
> But when I try to open in GrADS putting time as a variable (set 1 t 4)
> appears the following error message:
>
> ga-> set t 1 4
> Time values set: 2000:1:1:0 2000:4:1:0
> ga-> d tsoi
> Contouring: 273 to 279 interval 0.5
> gancgrid error: nc_get_vara_double failed; NetCDF: Index exceeds dimension
> bound
> Data Request Error:  Error for variable 'tsoi'
>    Error ocurred at column 1
> DISPLAY error:  Invalid expression
>    Expression = tsoi
> ga->
>
> You know how to help me change the time?
>
> All the best!
>
> Celso
>
>
>
> On Wed, 10 Jul 2013 12:43:38 -0700, Matt Masarik <mmasarik at atmos.ucla.edu>
> wrote:
>> Hi Celso,
>>
>> you can solve this by using a small (3 line) control file
>> that has the 365_day_calendar option specified.  Copy
>> the following text into a file, say, amazonia.ctl
>>
>> DSET ^amazonia.clm2.h0.2002-01-04-00000.nc
>> OPTIONS 365_day_calendar
>> tdef time 3084 linear 16jan1850 1mo
>>
>> I put your file name in the DSET line already.  You will
>> need to change the 3084 to the total number of time
>> records in the file.  You can find this out by issuing
>> the following at a command prompt:
>>
>> ncdump -c amazonia.clm2.h0.2002-01-04-00000.nc
>>
>> you will also need to change 16jan1850 to the start
>> date of your data set, again use ncdump.
>>
>> Once you make those changes you should be able to open
>> the file by using
>>
>> xdfopen amazonia.ctl
>>
>>
>> Matt
>>
>>
>> On 07/10/2013 11:50 AM, Celso Bandeira de Melo Ribeiro wrote:
>>> Hello,
>>> I'm working with GrADS Version 2.0.a9 in Linux Ubuntu 64-bit and I am
> not
>>> able to open NetCDF file.
>>> I am using the function "sdfopen" but an error message appears as
> sending
>>> the attachment.
>>> The message, as follows:
>>>
>>> ga-> sdfopen amazonia.clm2.h0.2002-01-04-00000.nc
>>> Scanning self-describing file:  amazonia.clm2.h0.2002-01-04-00000.nc
>>> SDF Error: 365 day calendars are no longer supported by sdfopen.
>>>     To open this file with GrADS, use a descriptor file with
>>>     a complete TDEF entry and OPTIONS 365_day_calendar.
>>>     Documentation is at
> http://iges.org/grads/gadoc/SDFdescriptorfile.html
>>> ga->
>>>
>>> I would like to know how solve this problem.
>>> Thank you!
>>> Celso
>>>
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