[ncl-talk] Problem GRIB2 file

Wed Apr 22 10:26:52 MDT 2015

netCDF-3 is the default for ncl_convert2nc. I think no variable can be > 2Gb

You must create nc4 (which is, under the hood, HDF5).

%> ncl_convert2nc NIC.IMS_ice_v3_201433700_1km.GRIB2 -nc4c

9684190860  NIC.IMS_ice_v3_201433700_1km.nc4

--

If you want a 'time' dimension

%> ncl_convert2nc NIC.IMS_ice_v3_201433700_1km.GRIB2 -nc4c -itime

Good luck

On Wed, Apr 22, 2015 at 8:08 AM, HAVENER, KEVIN F GS-12 USAF ACC 14 WS/WXED
<kevin.havener at us.af.mil> wrote:

> I am trying to ncl_convert2nc a grib2 file downloaded from the National
> Ice Center http://www.natice.noaa.gov/ims/grib2_v3_p1.html.  I either get
> this error:
>
>     Processing file: NIC.IMS_ice_v3_201504900_1km.GRIB2...
>      Copyright (C) 1995-2014 - All Rights Reserved
>      University Corporation for Atmospheric Research
>      NCAR Command Language Version 6.2.0
>      The use of this software is governed by a License Agreement.
>      See http://www.ncl.ucar.edu/ for more details.
>     fatal:systemfunc: cannot create child process:[errno=12]
>     fatal:["Execute.c":8567]:Execute: Error occurred at or near line 270
> in file /tmp/tmp12209-55379965.ncl
>
> Or this error:
>
>     Processing file: NIC.IMS_ice_v3_201504900_1km.GRIB2...
>      Copyright (C) 1995-2014 - All Rights Reserved
>      University Corporation for Atmospheric Research
>      NCAR Command Language Version 6.2.0
>      The use of this software is governed by a License Agreement.
>      See http://www.ncl.ucar.edu/ for more details.
> ncendef: ncid 65536: NetCDF: One or more variable sizes violate format
> constraints
> fatal:NetCDF: Operation not allowed in define mode: error attempting to
> write variable (ICEC_P31_GST0) to file (/home/havenerk/
> NIC.IMS_ice_v3_201504900_1km.nc)
> fatal:["Execute.c":8567]:Execute: Error occurred at or near line 628 in
> file /tmp/tmp16245-5537a2e1.ncl
> ncclose: ncid 65536: NetCDF: One or more variable sizes violate format
> constraints
>
> Pay no attention to the NCL versions.  I thought the first might be
> related to being able to write in a directory, but I got the same on 6.3.0,
> where I knew that wouldn't be a problem.  The second error only occurred
> under 6.2.0 after I eliminated the potential permission problem by moving
> the process to my home directory.  Only the first error occurs under my own
> personal laptop 6.3.0.
>
> It is a 1km resolution file on a polar stereographic grid.  I suspected
> the file size/resolution might be a problem, so I downloaded a 4km version
> of the same file.  Turns out it is different--has 3 variables in it instead
> of 1, so is actually larger.  Aside from not having the right local table
> for two of the parameters, the ice cover (only parameter in the 1km
> version) converted to netcdf properly.  So maybe still a resolution issue?
>
> Any idea what is going on here?  Hopeless case, bad grib2,or user error?
>
> Kevin Havener
>
> Here is an ncl_filedump of the file:
>
> ncl_filedump NIC.IMS_ice_v3_201504900_1km.GRIB2
>  Copyright (C) 1995-2014 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.2.0
>  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:       NIC.IMS_ice_v3_201504900_1km
> path:   NIC.IMS_ice_v3_201504900_1km.GRIB2
>    file global attributes:
>    dimensions:
>       ygrid_0 = 24576
>       xgrid_0 = 24576
>    variables:
>       float ICEC_P31_GST0 ( ygrid_0, xgrid_0 )
>          center :       US NOAA/NESDIS
>          production_status :    Operational products
>          long_name :    Ice cover
>          units :        Proportion
>          _FillValue :   1e+20
>          coordinates :  gridlat_0 gridlon_0
>          grid_type :    Polar stereographic can be south or north
>          parameter_discipline_and_category :    Oceanographic products, Ice
>          parameter_template_discipline_category_number :        ( 31, 10,
> 2, 0 )
>          forecast_time :        0
>          forecast_time_units :  hours
>          initial_time : 02/17/2015 (00:00)
>
>       float gridrot_0 ( ygrid_0, xgrid_0 )
>          long_name :    vector rotation angle
>          GridType :     Polar Sterographic Projection (North or South)
>          units :        radians
>          formula_u :    Ugrid = cos(rot)*Uearth - sin(rot)*Vearth
>          formula_v :    Vgrid = sin(rot)*Uearth + cos(rot)*Vearth
>          note1 :        u and v components of vector quantities are
> resolved relative to earth
>          note2 :        apply formulas to derive u and v components
> relative to grid
>
>       float gridlat_0 ( ygrid_0, xgrid_0 )
>          corners :      ( -21.4961, -21.2433, -20.98764, -21.2433 )
>          long_name :    latitude
>          grid_type :    Polar Sterographic Projection (North or South)
>          units :        degrees_north
>          Dy :    1
>          Dx :    1
>          Lov :  280
>          Lo1 :  235
>          La1 :  -21.4961
>
>       float gridlon_0 ( ygrid_0, xgrid_0 )
>          corners :      ( -125, -35.27276, 55, 145.2728 )
>          long_name :    longitude
>          grid_type :    Polar Sterographic Projection (North or South)
>          units :        degrees_east
>          Dy :    1
>          Dx :    1
>          Lov :  280
>          Lo1 :  235
>          La1 :  -21.4961
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20150422/a2772ef7/attachment.html 