Problem to open grib2 Nomad/CFSR data with opengrads
Dan Swank
Dan.Swank at NOAA.GOV
Tue Feb 9 15:34:54 EST 2010
Hello,
GrADS in general is not ready for the CFSR dataset.
I was able to use gradsdap alpha5 to sdfopen the source
you listed ~ but this is a THREDDS server, which is
presenting variable names which are too long for
grads to handle. [(q file) snipit]:
relative_humidi 0 t,y,x Relative humidity @ sigma
relative_humidi 0 t,y,x Relative humidity @ sigma_layer
relative_humidi 0 t,y,x Relative humidity @ zeroDegC_isotherm
specific_humidi 0 ty,x Specific humidity @ pressure
specific_humidi 0 ty,x Specific humidity @ pressure_difference_layer
storm_relative_ 0 ty,x Storm relative helicity @
height_above_ground_layer
stream_function 0 ty,x Stream function @ pressure
surface_lifted_ 0 t,y,x Surface Lifted Index @ surface
temperature 0 ty,x Temperature @ pressure
temperature_alt 4 t,z,y,x Temperature @ altitude_above_msl
temperature_pot 0 ty,x Temperature @ potential_vorticity_surface
temperature_max 0 t,y,x Temperature @ maximum_wind
So even if you managed to open it, you wouldn't get much further.
Connecting a GrADS client to a THREDDS server has many known issues.
It will flat out refuse to identify the x/y coordinates when opening
non-lat/lon grids served from THREDDS, for instance. Although the
source you specified IS a lat/lon, some CFSR sets are on
gaussian coordinates. The problem there is that THREDDS presents
the native grid x/y's without projecting it to a lat/lon
like a GDS does.
Attempting to download a GRIB2 file and creating a control
file will result in a gribmap2 not being able to MATCH the
time coordinates because of the new local GRIB table the headers
use. This is especially evident in the monthly means. This
pretty much stops us from putting the CFSR behind a GDS2.
I hope the GrADS dev-team will take some time to get the
CFSR working in GrADS.
-Dan Swank
NCDC-NOMADS Support
Henrique Barbosa wrote the following on 2/9/2010 12:12 PM:
> Dear All,
>
> I need help to access CFSR (NCEP reanalysis 3) over opendap with opengrads.
> I get an horrendous error message (see below) when I try to:
>
> ga-> sdfopen http://nomads.ncdc.noaa.gov/thredds/dodsC/cfsrmon/200912/pgblnl.gdas.200912.grb2
>
> I am using v2.0.a7.oga.3 downloaded from opengrads website. I do
> have opendap enabled (see output of 'q config' below).
>
> The strange thing is that I can open other sources of data, for example
>
> ga-> sdfopen http://nomads.ncep.noaa.gov:9090/dods/gfs/gfs20100111/gfs_00z
>
> works perfectly and I can plot, subset, etc...
>
> Any ideas?
>
> []s
> Henrique
>
>
> --------------------------------------------------------------------------------------------------------------------------------------------------
> ga-> q config
> Config: v2.0.a7.oga.3 little-endian readline printim grib2 netcdf
> hdf4-sds hdf5 opendap-grids,stn athena geotiff
> Grid Analysis and Display System (GrADS) Version 2.0.a7.oga.3
> Copyright (c) 1988-2009 by Brian Doty and the
> Institute for Global Environment and Society (IGES)
> This program is distributed WITHOUT ANY WARRANTY
> See file COPYRIGHT for more information.
>
> Built Thu Oct 29 17:57:08 EDT 2009 for x86_64-unknown-linux-gnu
>
> This version of GrADS has been configured with the following options:
> o Built on a LITTLE ENDIAN machine
> o Command line editing ENABLED
> http://tiswww.case.edu/php/chet/readline/rltop.html
> o printim command for image output ENABLED
> http://www.zlib.net
> http://www.libpng.org/pub/png/libpng.html
> http://www.libgd.org/Main_Page
> o GRIB2 interface ENABLED
> http://www.ijg.org
> http://www.ece.uvic.ca/~mdadams/jasper
> http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2
> g2clib-1.0.5
> o NetCDF interface ENABLED
> http://www.opendap.org
> libnc-dap 4.0.1-beta3-snapshot2009021712 of Mar 3 2009 14:13:33 $
> o HDF interface ENABLED
> http://hdfgroup.org
> HDF 4.2r3
> HDF5 1.8.2
> o Athena Widget GUI ENABLED
> o OPeNDAP gridded data interface ENABLED
> http://www.opendap.org
> libdap 3.7.10
> o OPeNDAP station data interface ENABLED
> http://iges.org/grads/gadoc/supplibs.html
> libgadap 2.0.oga.1
> o GeoTIFF and KML output ENABLED
> http://www.libtiff.org
> http://geotiff.osgeo.org
>
> For additional information please consult http://iges.org/grads
>
> --------------------------------------------------------------------------------------------------------------------------------------------------
> ga-> sdfopen http://nomads.ncdc.noaa.gov/thredds/dodsC/cfsrmon/2001912/pgblnl.gdas.200912.grb2
> Scanning self-describing file:
> http://nomads.ncdc.noaa.gov/thredds/dodsC/cfsrmon/200912/pgblnl.gdas.200912.grb2
> *** glibc detected *** grads: free(): invalid pointer: 0x00000000018ff354 ***
> ======= Backtrace: =========
> /lib/libc.so.6[0x2b6884e9fcb8]
> /lib/libc.so.6(cfree+0x76)[0x2b6884ea2276]
> grads(_Z15convert_nc_type7nc_typeiiPvS0_+0x2ca)[0x8011ea]
> grads(_ZN7NCArray14extract_valuesEPviiRK12ClientParams+0x2e9)[0x833a05]
> grads(_Z8DODvarioiiPKmS0_PKlPvi+0xc6e)[0x803aea]
> grads(nc3_get_vara_double+0x9e)[0x80e3b8]
> grads(nc_get_vara_double+0x1a)[0x60bcca]
> grads(read_one_dimension+0x89)[0x541ac1]
> grads(gadsdf+0x17d6)[0x540080]
> grads(gasdfopen+0x1d4)[0x53e700]
> grads(gacmd+0xfb2)[0x524504]
> grads(Main+0x4e1)[0x496f01]
> grads(main+0x2e)[0x496a16]
> /lib/libc.so.6(__libc_start_main+0xe6)[0x2b6884e465a6]
> grads(__gxx_personality_v0+0x1a9)[0x496959]
> ======= Memory map: ========
> 00400000-00cca000 r-xp 00000000 08:01 604869
> /usr/local/grads-2.0.a7.oga.3/bin/grads
> 00dc9000-00dea000 rwxp 008c9000 08:01 604869
> /usr/local/grads-2.0.a7.oga.3/bin/grads
> 00dea000-010aa000 rwxp 00dea000 00:00 0
> 0180f000-01a04000 rwxp 0180f000 00:00 0 [heap]
> 2b6882c7a000-2b6882c9a000 r-xp 00000000 08:01 83056
> /lib/ld-2.9.so
> 2b6882c9a000-2b6882c9d000 rwxp 2b6882c9a000 00:00 0
--
Dan Swank
STG, Incorporated - Government Contractor
NCDC-NOMADS Project: Software & Data Management
Data Access Branch
National Climatic Data Center
Veach-Baley Federal Building
151 Patton Avenue
Asheville, NC 28801-5001
Email: Dan.Swank at noaa.gov
Phone: 828-271-4007
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