[gradsusr] sdfopen and open

[James E. Johnson]

On Tuesday, November 27, 2012 05:31:59 pm Jennifer Adams wrote:
> The syntax of your descriptor file TES_data.ctl is incorrect. Please read
> http://iges.org/grads/gadoc/SDFdescriptorfile.html carefully. 
> 
> dset ^TES-Aura_L2-CO-Nadir_2006-06_L2v005_Litev003.nc
> title TES
> undef -999.f
> dtype netcdf
> xdef 360
> ydef 180
> zdef 14
> TDEF 00:00Z01Jun2006
> VARS
> 
> Also, I'm not sure whether Aura L2 data is gridded or swath data. If it is
> swath data, then GrADS is not the right tool.  --Jennifer

Hi,

These TES data are Level-2 swath data. They represent all the TES orbit swaths 
(typically 24-26 hours of data every other day) aggregated for an entire 
month. The dimensions are not 360 x 180 x 14 (which implies gridded), rather 
they are:

        grid_pressure_fm = 67 ;
        grid_targets = 27045 ;
        grid_pressure = 14 ;

where the grid_targets dimension represents the nadir profiles/targets (this 
number will vary from file to file), the other two dimensions are vertical 
pressure level dimensions (the first is the original L2 pressure levels, and 
the second grid_pressure are the reduced Lite pressure levels).

Since the data are Level-2, GrADS isn't really the best tool for examining 
these data.

You might want to read the documentation about these "Lite" products, if you 
already haven't, before using them 
http://avdc.gsfc.nasa.gov/download_2.php?site=635564035&id=10&go=download&path=&file=TES_Lite_Products_Users_Guide-
Litev005.pdf. Also check out 
http://tes.jpl.nasa.gov/uploadedfiles/LiteProductAdFinal.pdf

Gridded Level-3 products do exist at our sister organization at Langley ASDC, 
and you could read these into GrADS. See their web page 
http://eosweb.larc.nasa.gov/PRODOCS/tes/table_tes.html, and for the data via 
anonymous FTP at ftp://l4ftl01.larc.nasa.gov/TES/

------------------------------------------------------------------------------
| James E. Johnson                      | address:                           |
| Wyle Information Systems, Inc.        |  NASA Goddard Space Flight Center  |
| e-mail: james.johnson at nasa.gov        |  Distributed Active Archive Center |
| phone:  301-614-5121                  |  Code 610.2, Bldg 32, Room S130G   |
| fax:    301-614-5268                  |  Greenbelt, MD  20771              |
------------------------------------------------------------------------------

> 
> On Nov 27, 2012, at 4:03 PM, Jonathan Wynn Smith wrote:
> 
> Hello
> I have attached the following GrADs scripts.   I can not overlay ECMWF
> Reanalysis (open with sdfopen) data over TES Carbon monoxide.   The ECMWF
> uses the "sdfopen" command  and TES just uses "open." The seemingly simple
> fix placing the commands one right after the other:
> 
> "sdfopen filename.nc"
> "open  filename2.ctl"
> 
> "d var"
> 
> d var.2"
> 
> 
> does not work. I have attached my script and the control file for the TES
> data.  I get the error message saying that data associated with the TES
> file (thata variable is co.2) cannot be open.  See below:
> 
> ga-> co_TES.gs
> No hardcopy metafile open
> All files closed; all defined objects released;
> All GrADS attributes have been reinitialized
> Error: nc_open failed to open file /Users/jonathanwsmith/TES_hdf.
>  ctl
>  NetCDF: Unknown file format
> gadsdf: Couldn't ingest SDF metadata.
> Data Request Error:  File number out of range
>   Variable = co.2
>   Error ocurred at column 2
> DISPLAY error:  Invalid expression
>   Expression = (co.2)*1000000000
>  Cannot plot color bar: No shading information
> Data Request Error:  File number out of range
>   Variable = co.2
>   Error ocurred at column 2
> DISPLAY error:  Invalid expression
>   Expression = (co.2)*1000000000
>  Hardcopy output file is closed
> ga->
> 
> I know I have submitted this issue to grads before but am still
> struggling.  Any guidance would be GREATLY appreciated. Thanks
> Jonathan
> <co_TES_test.gs><TES_data.ctl>_____________________________________________
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> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org