Re: [idvusers] Plotting views across the prime meridian using IDD GFS

• To: idvusers@xxxxxxxxxxxxxxxx
• Subject: Re: [idvusers] Plotting views across the prime meridian using IDD GFS
• From: "[BE] Ufuk Utku Turuncoglu" <turuncu@xxxxxxxxxxxxx>
• Date: Thu, 03 Jan 2008 15:01:20 +0200

Hi,

for time subset:

and for lat lon subset;

rm EH5_OM_A2_1_TEMP2_1-100809.grb

but i don't know about GRIB2 support and CDO (Climate Data Operator).

import Nio
from Numeric import *
import os

# slab dimensions
os.system('rm nnrp.slab.nc')
os.system('ncks -d lon,330.0,80.0 -d lat,17.5,60.0 nnrp.nc nnrp.slab.nc')

# open netcdf file
nc = Nio.open_file("./nnrp.slab.nc", "rw")
lon = nc.variables['lon']

# fix dimension >> monotonic
for i in xrange (0,12):
       lon[i] = lon[i][0]-360.0

# close file
nc.close()

best

Ufuk Utku Turuncoglu
Istanbul Technical University
Informatics Institute

webmaster-IWC wrote:

Hi Dan,

I have not worked out how to directly reply to your question on the

forum, so I have done it this way.

I have had the same problem and I know the cause and a possible

solution, but the solution requires creating a regional subset of the
grib or NetCDF file.

The problem lies with the grib file starting from 0 - 359 and IDV not

able to join the two halves of the map together. If you can create the
grib file to start from -60 to 60 then this draws this Ok.

This was not a problem as software is available for grib 1 products to

create regional subsets is available, but the NCEP will be switching to
grib2 and that's where the my problem is.

Where I used to used GGRIB to create sub regions, this will not work for

grib2 products.

So if any programmers read this, I am in desperate need of a program

which will create sub regions of grib2 products complied for windows XP.

Ian Gooch

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