[gradsusr] problems plotting parts of netcdf file in GrADS from 20W to 30E longitude

[Andrew Friedman]

Hi Jason,

I believe that you should be able to do this within GrADS without having to
modify your file externally.

Try writing a control file specifying your file dimensions, and opening it
using xdfopen:
http://www.iges.org/grads/gadoc/SDFdescriptorfile.html

Does this work?

Here's a recent thread discussing a related issue:
http://gradsusr.org/pipermail/gradsusr/2015-September/038869.html

-Andrew

On Mon, Oct 5, 2015 at 1:04 AM, Jason Snyder <jmssnyder at ucdavis.edu> wrote:

>
>
>
> I am trying to plot u velocity values from a netcdf file in GrADS from
> longitude 20W (-20) to longitude 30E (30). The netcdf file is formated so
> it only displays data from 0 to 360 where 0 is on the prime meridion. When
> I tried to plot anything to the east of the dateline it says the data is
> out of range. I also tried to add 360 to the negative longitude values and
> it does not have data for this. How can I set up grads to plot both the
> area east and west of the prime meridion (0 degrees) using GrADS?
>
> I have the below gs script options:
>
> 'sdfopen file.nc'
> 'set lon 340 to 390'
> 'd u'
>
> The above plots the map from 340 degrees to 390 but nothing east of 360
> degrees.
>
> or
>
> 'sdfopen file.nc'
> 'set lon -20 to 30'
> 'd u'
>
> The above script gives an error message saying -20 is out of range.
>
> Also how can I modify the netcdf file to that it can plot u values to the
> east of 360 degrees. Should I use gdal (www.gdal.org) or cdo (
> https://code.zmaw.de/projects/cdo,
> https://www.unidata.ucar.edu/software/netcdf/workshops/2012/third_party/CDO.html
> )
>
> Thank you for your help.
>
> Jason
>
>
>
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>
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