[gradsusr] How can we write XDEF to open *.nc files?

Mon Jan 20 22:23:16 EST 2014

Sorry for asking my question in a very poor way. But this is what I dd and I got this error?
------------------------------------
ga-> run c:/Users/CHARLES/Desktop/Grads/narropen.gs
must include following args:
narropen netCDFfile VarName NumTimes StartTime DeltaT [out.ddf] [VerticalCoord]
[HorizRes]
Where:
netCDFfile is full path to netcdf file
VarName is the variable name in netcdf file
NumTimes is the number of timesteps in the netCDF file
StartTime is the first time in the file (e.g. 00z01jan1979)
DeltaT is the time increment between timesteps (e.g. 3hr, 1dy, 1mo, or 1yr)
out.ddf is the optional full path to the generated ddf file ./.ddf is the default
VerticalCoord is one of following: sfc or press or subsfc (sfc default)
HorizRes is the resolution to regrid to: 0.33 or 1.0 (0.33 default)
ga->

Now the question is how can I use the script since it has no instruction on how to use it?

Charles Langton Vanya
(Principal Meteorologist)
---------------------------------------------------------------------------------

Department of Climate Change and Meteorological Services,
Regional Government Offices-(Next to Immigration Office),
Box 1808
Blantyre,Malawi
---------------------------------------------------------------------------------
Tel:       (+ 265) 1 822 014
Cell:     (+265) 888 980 545 / 999 380 545

Fax:     (+265) 1 822 215
----------------------------------------------------------------------------------

"Tell me and I'll forget, show me and I may remember; involve me and I will understand"

On Tuesday, January 21, 2014 5:08 AM, Charles Vanya <charles.vanya at yahoo.com> wrote:

Thanks to Jennifer and Hoop for providing such kind of assistance.
 I have downloaded  the data file and I am using Grads on windows,now my next question is "How can I run this script when I am unable to open the file in Grads?". 

I know  how to run some *.gs scripts where the scripts bears the path to the file you want to run. In this case I have several files in the smae folder but I just want one file called cape.2013.nc. 

Should I  to put the script in the same folder as data?
I want some direction on what do I need to do say."How do I link this file and the script?"

Thanks all

Charles Langton Vanya
(Principal Meteorologist)
---------------------------------------------------------------------------------

Department of Climate Change and Meteorological Services,
Regional Government Offices-(Next to Immigration Office),
Box 1808
Blantyre,Malawi
---------------------------------------------------------------------------------
Tel:       (+ 265) 1 822 014
Cell:     (+265) 888 980 545 / 999 380 545

Fax:     (+265) 1 822 215
----------------------------------------------------------------------------------

"Tell me and I'll forget, show me and I may remember; involve me and I will understand"

On Monday, January 20, 2014 8:35 PM, Jennifer Adams <jma at cola.iges.org> wrote:

This file needs a PDEF entry, and narropen.gs will do all the work to create a working descriptor file for you. The only thing I would suggest is that you download the file and read it from your local disk instead of using a URL in your DSET entry and doing the I/O via opendap. The I/O for a pdef'd file via opendap is prohibitively slow. It is on my list of things to fix. 
--Jennifer

On Jan 20, 2014, at 1:02 PM, Hoop wrote:

Charles Vanya,
>
>The NARR data are on a Lambert Conformal Conic grid, not a regular
>lat-lon grid.  The good news is, there's a standard script for
>opening them.  It takes the arguments you give it, writes a
>Data Descriptor File (DDF) for the NARR data file, and then opens
>it with the "open" command.  The name of the script is "narropen",
>and, as I said, it's part of the standard suite of scripts.  It may
>be found at:
>
>ftp://cola.gmu.edu/grads/scripts/narropen.gs
>
>You can learn how to call it by running it without arguments.
>
>-Hoop
>
>
>Date: Mon, 20 Jan 2014 03:07:34 -0800 (PST)
>>
>From: Charles Vanya <charles.vanya at yahoo.com>
>>
>Subject: [gradsusr] How can we write XDEF to open *.nc files?
>>
>To: "gradsusr at gradsusr.org" <gradsusr at gradsusr.org>
>>
>
>>
>Dear All,
>>
>?I am novel with GrADS and recently was doing a case study of a lightning
>>
>that killed 8 people at once and same place. As I was trying to load
>>
>cape.2013.nc and cin.2013.nc I encountered an error that I am failing to
>>
>resolve up to now. The error is shwon below:
>>
>=====================================================
>>
>
>>
>ga-> sdfopen c:/Users/CHARLES/Downloads/cape.2013.nc
>>
>Scanning self-describing file:? c:/Users/CHARLES/Downloads/cape.2013.nc
>>
>gadsdf: SDF file has no discernable X coordinate.
>>
>? To open this file with GrADS, use a descriptor file with an XDEF entry.
>>
>? Documentation is at http://iges.org/grads/gadoc/SDFdescriptorfile.html
>>
>ga->?======================================
>>
>Now the question is how can I open such kind of data in Grads. I read
>>
>through the mentioned document but it is not helpful to me. Can any one
>>
>help me with guidance and set of commands to open and read this data?
>>
>the data is accessible from
>>
>http://www.esrl.noaa.gov/psd/thredds/fileServer/Datasets/NARR/monolevel/cin.2013.nc?
>>
>Thanks in advance
>>
>?
>>
>Charles Langton Vanya
>>
>(Principal Meteorologist)
>>
>---------------------------------------------------------------------------------
>>
>
>>
>Department of Climate Change and Meteorological Services,
>>
>Regional Government Offices-(Next to Immigration Office),
>>
>Box 1808
>>
>Blantyre,Malawi
>>
>---------------------------------------------------------------------------------
>>
>Tel:?? ??? (+ 265) 1 822 014
>>
>Cell: ??? (+265) 888 980 545 / 999 380 545
>>
>
>>
>Fax:???? (+265) 1 822 215
>>
>----------------------------------------------------------------------------------
>>
>
>>
>"Tell me and I'll forget, show me and I may remember; involve me and I will understand"
>>_______________________________________________
>gradsusr mailing list
>gradsusr at gradsusr.org
>http://gradsusr.org/mailman/listinfo/gradsusr
>

--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 

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