[ncl-talk] Issue reading grib in 6.3.0?

Thu Apr 9 08:27:40 MDT 2015

Aha! I was adding ".grib", which worked in the previous version, but not
now. The addfile documentation
<http://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml>lists
these as possible grib extensions:
".gr", ".gr1", ".grb", ".grib", ".grb1", ".grib1", ".gr2", "grb2", ".grib2"

I get errors in 6.3.0 if I use ".gr1:, ".gr2", or ".grib" for this
particular file. I see there were significant changes to the handling of
grib files, but I can't tell whether this change was either intentional or
documented.

    Carl

On Thu, Apr 9, 2015 at 10:11 AM, Dennis Shea <shea at ucar.edu> wrote:

> Hi Carl,
>
> In the following, the file name is:  nam.t06z.awip1203
>
> You must add the '.grb' extension
>
> %> ncl_filedump nam.t06z.awip1203.grb
>
> NCL will look for a file named "nam.t06z.awip1203.grb" on the disk.
> If it does not find it, NCL will look for "nam.t06z.awip1203" and
> 'remember' to treat it as a grib file.
>
> One file
>
>   f = addfile("nam.t06z.awip1203.grb","r")
>
>
> For multiple files
>
>
>    diri = "./"
>    fili = systemfunc("cd "+diri+" ; ls nam.t06z.awip*")
>    f   = addfiles(diri+fili+".grb")
>     ListSetType (f, "join")
>
> HTH
> D
>
>  Copyright (C) 1995-2015 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.3.0
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
>
> Variable: f
> Type: file
> filename:       nam.t06z.awip1203
> path:   nam.t06z.awip1203
>    file global attributes:
>    dimensions:
>       ygrid_0 = 428
>       xgrid_0 = 614
>       lv_ISBL0 = 4
>       lv_SIGL1 = 5
>       lv_SPDL2 = 6
>       lv_HTGL3 = 2
>       lv_SPDL4 = 5
>       lv_ISBL5 = 2
>       lv_ISBL6 = 5
>       lv_SPDL7 = 3
>       lv_HTGL8 = 2
>       lv_HTGL9 = 2
>       lv_DBLL10 = 4
>    variables:
>       float TMP_P0_L1_GLC0 ( ygrid_0, xgrid_0 )
>          center :       US National Weather Service - NCEP (WMC)
>          production_status :    Operational products
>          long_name :    Temperature
>          units :        K
>          _FillValue :   1e+20
>          coordinates :  gridlat_0 gridlon_0
>          grid_type :    Lambert Conformal can be secant or tangent,
> conical or bipolar
>          parameter_discipline_and_category :    Meteorological products,
> Temperature
>          parameter_template_discipline_category_number :        ( 0, 0, 0,
> 0 )
>          level_type :   Ground or water surface
>          level :         0
>          forecast_time :        3
>          forecast_time_units :  hours
>          initial_time : 04/09/2015 (06:00)
>
> [SNIPu
>
>
>
>
> On Thu, Apr 9, 2015 at 7:54 AM, Carl Schreck <cjschrec at ncsu.edu> wrote:
>
>> I'm having a strange issue where NAM forecast grib files from ldm are not
>> able to be read in 6.3.0. A sample file is:
>> ftp://filsrv.cicsnc.org/carl/temp/nam.t06z.awip1203
>>
>> The error I get is:
>> --
>> fatal:["FileSupport.c":4159]:(/home/carl/ftp/temp/nam.t06z.awip1203.grib)
>> has no file extension, can't determine type of file to open
>>
>> Variable: f
>> Type: file
>> (0) File Missing Value : -1
>> --
>> Renaming the file to have a .grib extension makes no difference. It does
>> work if I roll back to 6.2.1, however.
>>
>> The binaries I downloaded are:
>> ncl_ncarg-6.2.1.Linux_SL6.5_x86_64_gcc447.tar.gz
>> ncl_ncarg-6.3.0.Linux_RHEL6.4_x86_64_gcc447.tar.gz
>>
>> Thanks!
>>
>>     Carl
>> --
>>
>> <http://www.cicsnc.org/>
>> <http://www.researcherid.com/rid/B-8711-2011>
>> * Cyclone <http://www.cyclonecenter.org/>*Center.org
>> <http://www.cyclonecenter.org/>  *Carl J. Schreck III, PhD*
>> *Research Associate*
>> North Carolina Institute for Climate Studies (NCICS) /
>> Cooperative Institute for Climate and Satellites NC (CICS-NC)
>> <http://www.cicsnc.org/>
>> North Carolina State University <http://ncsu.edu/>
>> NOAA National Centers for Environmental Information (NCEI)
>> <http://ncdc.noaa.gov/>
>> 151 Patton Ave, Asheville, NC 28801
>> e: cjschrec at ncsu.edu
>> o: +1 828 257 3140
>> Publications
>> <http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
>> monitor.cicsnc.org/mjo
>>
>> _______________________________________________
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>>
>>
>

-- 

<http://www.cicsnc.org/>
<http://www.researcherid.com/rid/B-8711-2011>
* Cyclone <http://www.cyclonecenter.org/>*Center.org
<http://www.cyclonecenter.org/>  *Carl J. Schreck III, PhD*
*Research Associate*
North Carolina Institute for Climate Studies (NCICS) /
Cooperative Institute for Climate and Satellites NC (CICS-NC)
<http://www.cicsnc.org/>
North Carolina State University <http://ncsu.edu/>
NOAA National Centers for Environmental Information (NCEI)
<http://ncdc.noaa.gov/>
151 Patton Ave, Asheville, NC 28801
e: cjschrec at ncsu.edu
o: +1 828 257 3140
Publications
<http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
monitor.cicsnc.org/mjo
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