Re: Can't read NCEP NAM12 Grib2 files

Hi Ron,

I tried reading a sample file (nam.t00z.awip1203.tm00.grib2) that I
got from the site you mention and the output looked pretty normal.
(There were a few parameter codes that were unrecognized, but in
general the variables and grids looked reasonable.)

Your sample code below uses 'addfiles'. Do you have the same problem
if you just read one file? Are you saying that when you
do an 'ncl_filedump' it does not produce any content in the file.

Perhaps you could tell me specifically which files you are trying to
use with your sample code.
Thanks,
  -dave

On Mar 30, 2009, at 12:15 PM, Ron Chapman wrote:

> We are having difficulty reading NCEP NAM12 grib2 files from the NOAA
> ftp site. The actual grib files are the NAM 218 AWIPS Grid - CONUS
> (12-km Resolution) found at the link
> http://www.nco.ncep.noaa.gov/pmb/products/nam
>
> The output from ncl_dumpfile is
>
> $ ncl_filedump nam.grib
> Copyright (C) 1995-2009 - All Rights Reserved
> University Corporation for Atmospheric Research
> NCAR Command Language Version 5.1.0
> The use of this software is governed by a License Agreement.
> See http://www.ncl.ucar.edu/ for more details.
> Variable: f (file variable)
>
> filename: nam
> path: nam.grib
> file global attributes:
> dimensions:
> variables:
>
> when I try and read the grib file with the following ncl script I
> get a
> segmentation fault.
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>
> begin
>
> diri = "./nam_dynamic/" ; input data directory
> setfileoption("grb","SingleElementDimensions","Forecast_time" )
> fils = systemfunc("cd "+diri +" ; ls DOWNLOAD*.grib")
> f = addfiles (diri+fils, "r")
> end
>
> Any suggestions??
>
>
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Received on Mon Mar 30 2009 - 12:33:49 MDT