[gradsusr] Displaying a .nc file
David Stanfel
dstanfel at ualberta.ca
Thu Jun 19 13:14:22 EDT 2014
I made the changes that were recommended with the following results. My X11
window does pop up when I run grads but it stays black. This is what
happens when I try to display a variable:
ga-> open cont.ctl
Scanning description file: cont.ctl
Data file atmos_month.nc.0000 is open as file 1
LON set to 0 360
LAT set to -88.29 88.29
LEV set to 1000 1000
Time values set: 0:1:1:0 0:1:1:0
E set to 1 1
ga-> q file
File 1 : 6 Months Sample Model Output
Descriptor: cont.ctl
Binary: atmos_month.nc.0000
Type = Gridded
Xsize = 96 Ysize = 80 Zsize = 18 Tsize = 804 Esize = 1
Number of Variables = 7
u 18 t,z,y,x u
v 18 t,z,y,x v
w 18 t,z,y,x v
t 18 t,z,y,x v
sh 18 t,z,y,x v
rh 18 t,z,y,x v
z 18 t,z,y,x v
ga-> d u
Error: Variable u not in netcdf file
Data Request Error: Error for variable 'u'
Error ocurred at column 1
DISPLAY error: Invalid expression
Expression = u
ga-> d z
Error: Variable z not in netcdf file
Data Request Error: Error for variable 'z'
Error ocurred at column 1
DISPLAY error: Invalid expression
Expression = z
It still does not recognize that that variable is in the netcdf file for
some reason.
Thanks,
David
On Thu, Jun 19, 2014 at 10:22 AM, Hosmay Lopez <hlopez at rsmas.miami.edu>
wrote:
> Try this CTL file:
>
> The only difference is how you defined the variables' arguments.
>
>
> DSET ^atmos_month.nc.0000
> UNDEF 1.e-10
> DTYPE netcdf
> TITLE 6 Months Sample Model Output
> *
> XDEF 96 LINEAR 0.0 3.75
> *
> YDEF 80 GAUSR30 1
> *
> ZDEF 18 LEVELS 1000 950 900 850 800 750 700 650 600 550 500 450 400 350
> 300
> 250 200 150
> *
> TDEF 804 LINEAR JAN0 1MO
> *
> VARS 7
> u 18 t,z,y,x u
> v 18 t,z,y,x v
> w 18 t,z,y,x v
> t 18 t,z,y,x v
> sh 18 t,z,y,x v
> rh 18 t,z,y,x v
> z 18 t,z,y,x v
> ENDVARS
>
> Good luck!
>
> Hosmay Lopez
> UM/CIMAS/RSMAS NOAA/AOML/PHOD
> 4301 Rickenbacker Causeway,
> Miami, FL 33149, USA
> Phone: (305) 361-4329
>
> ------------------------------
> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on
> behalf of David Stanfel [dstanfel at ualberta.ca]
> *Sent:* Thursday, June 19, 2014 12:07 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] Displaying a .nc file
>
> It did prompt a list of variables including u, v, w, and z. It still
> doesn't want to display them.
>
> ga-> q file
>
> File 1 : 6 Months Sample Model Output
>
> Descriptor: cont.ctl
>
> Binary: atmos_month.nc.0000
>
> Type = Gridded
>
> Xsize = 96 Ysize = 80 Zsize = 18 Tsize = 804 Esize = 1
>
> Number of Variables = 7
>
> u 18 0 u
>
> v 18 0 v
>
> w 18 0 v
>
> t 18 0 v
>
> sh 18 0 v
>
> rh 18 0 v
>
> z 18 0 v
>
> ga-> d v
>
> Data Request Error: Error for variable 'v'
>
> Error ocurred at column 1
>
> DISPLAY error: Invalid expression
>
> Expression = v
>
> ga-> d sh
>
> Error: Variable sh not in netcdf file
>
> Data Request Error: Error for variable 'sh'
>
> Error ocurred at column 1
>
> DISPLAY error: Invalid expression
>
> Expression = sh
>
> Thanks,
>
> David
>
>
> On Wed, Jun 18, 2014 at 11:58 PM, James T. Potemra <jimp at hawaii.edu>
> wrote:
>
>> If you enter "q file" at the GrADS prompt it should list the variables.
>>
>>
>> On 6/18/14 5:52 PM, David Stanfel wrote:
>>
>> How do I know what variable name will work? I've tried u, v, w, and z and
>> still only get:
>>
>> ga-> d v
>>
>> Error: Variable v not in netcdf file
>>
>> Data Request Error: Error for variable 'v'
>>
>> Error ocurred at column 1
>>
>> DISPLAY error: Invalid expression
>>
>> Expression = v
>>
>> Thanks,
>>
>> David
>>
>>
>> On Wed, Jun 18, 2014 at 11:13 PM, Hosmay Lopez <hlopez at rsmas.miami.edu>
>> wrote:
>>
>>> David,
>>>
>>> You should let GrADS know that the file is a netCDF. You do that by
>>> adding the following text line in your control file:
>>>
>>> DTYPE netcdf
>>>
>>> Insert such after the UNDEF line.
>>>
>>> Good luck!
>>>
>>> Hosmay Lopez
>>> UM/CIMAS/RSMAS NOAA/AOML/PHOD
>>> 4301 Rickenbacker Causeway,
>>> Miami, FL 33149, USA
>>> Phone: (305) 361-4329
>>>
>>> ------------------------------
>>> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org]
>>> on behalf of David Stanfel [dstanfel at ualberta.ca]
>>> *Sent:* Wednesday, June 18, 2014 10:58 PM
>>> *To:* GrADS Users Forum
>>> *Subject:* [gradsusr] Displaying a .nc file
>>>
>>> So I figured out how to use a descriptor file but I am still having
>>> troubles opening the file. My descriptor file is as follows:
>>>
>>> DSET ^atmos_month.nc.0000
>>> UNDEF 1.e-10
>>> TITLE 6 Months Sample Model Output
>>> *
>>> XDEF 96 LINEAR 0.0 3.75
>>> *
>>> YDEF 80 GAUSR30 1
>>> *
>>> ZDEF 18 LEVELS 1000 950 900 850 800 750 700 650 600 550 500 450 400 350
>>> 300
>>> 250 200 150
>>> *
>>> TDEF 804 LINEAR JAN0 1MO
>>> *
>>> VARS 7
>>> u 18 0 u
>>> v 18 0 v
>>> w 18 0 v
>>> t 18 0 v
>>> sh 18 0 v
>>> rh 18 0 v
>>> z 18 0 v
>>> ENDVARS
>>>
>>> It was able to open it without issue:
>>>
>>> ga-> open cont.ctl
>>>
>>> Scanning description file: cont.ctl
>>>
>>> Data file atmos_month.nc.0000 is open as file 1
>>>
>>> LON set to 0 360
>>>
>>> LAT set to -88.29 88.29
>>>
>>> LEV set to 1000 1000
>>>
>>> Time values set: 0:1:1:0 0:1:1:0
>>>
>>> E set to 1 1
>>>
>>>
>>> However, I am having trouble displaying the data. I tried to use the
>>> display command (d) with this result:
>>>
>>>
>>> ga-> d atmos_month.nc.0000
>>>
>>> Syntax error: Bad file number for variable atmos_month
>>>
>>> Error ocurred at column 1
>>>
>>> DISPLAY error: Invalid expression
>>>
>>> Expression = atmos_month.nc.0000
>>>
>>>
>>> Is my syntax off?
>>>
>>>
>>> Thanks,
>>>
>>>
>>> David
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
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