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

[Charles Vanya]

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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