making

[Azar Zarrin]

Jason,

I don't know how to use the xconv utility. However, you can write a data descriptor file (.ctl) for your NetCDF file if you know the dimensions, variables, and
attributes of your file.

First, do a "ncdump -h foo.nc''  to see the header of your NetCDF file.
Then, look at this page which simply describes how to write a descriptor file.

http://www.iges.org/grads/gadoc/aboutgriddeddata.html#descriptor

I hope this helps.
Azar

--- On Fri, 11/20/09, Jason Snyder <jmssnyder at UCDAVIS.EDU> wrote:

From: Jason Snyder <jmssnyder at UCDAVIS.EDU>
Subject: making
To: GRADSUSR at LIST.CINECA.IT
Date: Friday, November 20, 2009, 10:32 PM

I have a NetCDF data set that is a composite of wind data based on certain
phases of the Madden Julian Oscillation and I was interested in looking at
the backwards trajectories of air parcels coming into Lake Tahoe in such a
scenario.  I have been trying to work with the script traj.gs, but GrADS
said that TDEF is undefined.  I was then told that I need to use a .ctl
file, but how do I convert data in NetCDF format to that that can be used
in a .ctl file which I would need to run the script traj.gs.  Someone
suggested that I use Use xconv utility, which has the website:
http://badc.nerc.ac.uk/help/software/xconv/

However, I could not figure out how to use this program to convert a
NetCDF file to a .ctl file.  Can someone show me how to use this program,
or some other ways to obtained .ctl files that I could use in running the
traj.gs script?

Thanks,

Jason



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