[ncl-talk] Problem GRIB2 file

HAVENER, KEVIN F GS-12 USAF ACC 14 WS/WXED kevin.havener at us.af.mil
Mon May 11 23:07:03 MDT 2015


Thanks for the advice, Dennis.  I got rid of error number 2 on 6.2.0.  Now both 6.2.0 and 6.3.0 give error 1:

fatal:systemfunc: cannot create child process:[errno=12]
fatal:["Execute.c":8567]:Execute: Error occurred at or near line 270 in file /tmp/tmp9336-5537df08.ncl

I will do some more thinking and cooperating with the National Ice Center.  I'm not sure that 1km resolution grib file is constructed properly, anyway.

Kevin Havener


-----Original Message-----
From: Dennis Shea [mailto:shea at ucar.edu] 
Sent: Wednesday, April 22, 2015 12:27 PM
To: HAVENER, KEVIN F GS-12 USAF ACC 14 WS/WXED
Cc: ncl-talk at ucar.edu
Subject: Re: [ncl-talk] Problem GRIB2 file

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
	
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