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

• To: webmaster-IWC <webmaster@xxxxxxxxxxxxxxxxxxxxxxxxxx>, 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 16:08:30 +0200

--ufuk

webmaster-IWC wrote:

I don't suppose you know where I could obtain a complied version of NCO
for windows XP. I have not got a clue about compiling




-----Original Message-----

From: [BE] Ufuk Utku Turuncoglu [mailto:turuncu@xxxxxxxxxxxxx] Sent: 03 January 2008 13:49

To: webmaster-IWC
Cc: idvusers@xxxxxxxxxxxxxxxx
Subject: Re: [idvusers] Plotting views across the prime meridian using
IDD GFS

NCO (netCDF Operator) is an utility to be used for processing netcdf files. It could be change dimensions, extracts sub regions etc. The web site is http://nco.sourceforge.net/

i hope this helps you,

--ufuk


webmaster-IWC wrote:

Hi
Thanks for replying.

PINGO does not support GRIB2 products.

What is the NCO ?

Ian


-----Original Message-----

From: idvusers-bounces@xxxxxxxxxxxxxxxx [mailto:idvusers-bounces@xxxxxxxxxxxxxxxx] On Behalf Of [BE] Ufuk Utku

Turuncoglu
Sent: 03 January 2008 13:01
To: idvusers@xxxxxxxxxxxxxxxx
Subject: Re: [idvusers] Plotting views across the prime meridian using

IDD GFS


Hi,

For GRIB files you can use PINGO
(http://www.mad.zmaw.de/Pingo/pingohome.html), for example

for time subset:
grb selrec,1,100809 ../A2/EH5_OM_A2_1_TEMP2_1-146096.grb
EH5_OM_A2_1_TEMP2_1-100809.grb

and for lat lon subset;
grb sellonlatbox,290,360,80,10 ./EH5_OM_A2_1_TEMP2_1-100809.grb
./EH5_OM_A2_1_TEMP2_1-100809_290-360-80-10.grb

grb sellonlatbox,0,70,80,10 ./EH5_OM_A2_1_TEMP2_1-100809.grb ./EH5_OM_A2_1_TEMP2_1-100809_0-70-80-10.grb

rm EH5_OM_A2_1_TEMP2_1-100809.grb

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

For netcdf files NCO can modify the netcdf file as you want. The
following PyNGL scripts helps to you,

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()

The os.system part of the code gets subset of the file and rest of the
code correct 360 problem and generates monotonic dimension.

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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• References:
  • Re: [idvusers] Plotting views across the prime meridian using IDD GFS
    • From: webmaster-IWC