Thanks,
The files can be downloaded at the following page...under the MET-9 files.
http://oiswww.eumetsat.int/~idds/html/grib.html
> 1) the problem with 5.1.0 is a result of a missing flag in the compilation
> of the NCEP-supplied GRIB 2 low-level library. It causes all GRIB 2 files to
> seem empty. It only affects 64-bit versions of NCL so this diagnosis is
> based on the assumption that you are using a 64-bit NCL.
I was also wondering why this version didn't work with GFS GRIB2 data.
Also, the build of NCL is below...it is 64 bit.
ncl_ncarg-5.1.0.Linux_x86_64_gcc411
> 2) The missing parameter entries are visible in your file as variables
> VAR_3_1_98_P30_GLL1 and VAR_3_1_99_P30_GLL1. Coordinate variables in NCL's
> representation of GRIB data are always generated by NCL. They are not found
> in the code tables and therefore do not have parameter numbers.
This is what I suspected.
> 3) The space-view perspective grid is not fully supported yet in NCL. That
> is why there are no coordinate variables associated with dimensions 'lat_0'
> or 'lon_0'. However,
> there should have been a warning indicating this fact and the dimension
> names are misleading and seems to indicate a bug. They should have 'x' and
> 'y' in their names rather than 'lat' and 'lon'. Implementing coordinates for
> the space-view perspective grid is on the active priority list, and
> hopefully will be completed soon.
Sounds good. Would there be a way to output some information on the
coordinates that would give me a way to convert to lat/lon? I guess I
could also go the route of converting the data to some other format
(via the ECMWF GRIB2 library
[http://www.ecmwf.int/products/data/software/grib2.html]) first.
> 4) The Lo1 and La1 attributes for the lat_1, lon_1 coordinates seem to be
> incorrect as well.
Thanks,
Matt
On Thu, May 14, 2009 at 3:16 PM, David Brown <dbrown_at_ucar.edu> wrote:
> Hi Matthew,
>
> I can explain some aspects of your problem, but there are others that are a
> mystery and seem to indicate problems. It would be good either if you can
> tell us where to download a sample file or else if you can upload a sample
> to ftp.cgd.ucar.edu:
>
> (
> ftp ftp.cgd.ucar.edu
> log in as anonymous;
> cd incoming
> binary
> put <filename>
> and then send email telling us the name of the file.
> )
>
> Here is what I can tell you:
> 1) the problem with 5.1.0 is a result of a missing flag in the compilation
> of the NCEP-supplied GRIB 2 low-level library. It causes all GRIB 2 files to
> seem empty. It only affects 64-bit versions of NCL so this diagnosis is
> based on the assumption that you are using a 64-bit NCL.
> 2) The missing parameter entries are visible in your file as variables
> VAR_3_1_98_P30_GLL1 and VAR_3_1_99_P30_GLL1. Coordinate variables in NCL's
> representation of GRIB data are always generated by NCL. They are not found
> in the code tables and therefore do not have parameter numbers.
> 3) The space-view perspective grid is not fully supported yet in NCL. That
> is why there are no coordinate variables associated with dimensions 'lat_0'
> or 'lon_0'. However,
> there should have been a warning indicating this fact and the dimension
> names are misleading and seems to indicate a bug. They should have 'x' and
> 'y' in their names rather than 'lat' and 'lon'. Implementing coordinates for
> the space-view perspective grid is on the active priority list, and
> hopefully will be completed soon.
> 4) The Lo1 and La1 attributes for the lat_1, lon_1 coordinates seem to be
> incorrect as well.
> -dave
>
>
> On May 14, 2009, at 12:09 PM, Matthew Janiga wrote:
>
>> I'm having some peculiar problems reading the Meteosat Multi-sensor
>> precipitation files in GRIB2.
>>
>> http://oiswww.eumetsat.int/~idds/html/grib.html (MET-9 files)
>>
>> I have tried using NCL version 5.0.1 and 5.1.0. NCL_filedump in
>> version 5.0.1 is able to display most of the variables...
>>
>> Copyright (C) 1995-2008 - All Rights Reserved
>> University Corporation for Atmospheric Research
>> NCAR Command Language Version 5.0.1-beta
>> The use of this software is governed by a License Agreement.
>> See http://www.ncl.ucar.edu/ for more details.
>> warning: Entry (98) not found in code table file
>> /jm12/carl/ncl-5.0.1-beta/lib/n
>> carg/grib2_codetables/ecmwf/4/4.2.3.1.table
>> warning: Entry (99) not found in code table file
>> /jm12/carl/ncl-5.0.1-beta/lib/n
>> carg/grib2_codetables/ecmwf/4/4.2.3.1.table
>> Variable: f (file variable)
>>
>> filename: MPE_20090513_0000_M9_00
>> path: MPE_20090513_0000_M9_00.grb
>> file global attributes:
>> dimensions:
>> lat_0 = 3712
>> lon_0 = 3712
>> lat_1 = 24
>> lon_1 = 24
>> variables:
>> float INSTRR_P30_GSV0 ( lat_0, lon_0 )
>> center : EUMETSAT Operation Centre
>> production_status : Operational test products
>> long_name : Instantaneous rain rate
>> units : kg m-2 s-1
>> _FillValue : -999
>> grid_type : Space view perspective or orthographic
>> parameter_discipline_and_category : Space products, Moisture
>> parameter_template_discipline_category_number : ( 30, 3, 1,
>> 1 )
>> initial_time : 05/13/2009 (00:00)
>>
>> float VAR_3_1_98_P30_GLL1 ( lat_1, lon_1 )
>> center : EUMETSAT Operation Centre
>> production_status : Operational test products
>> long_name : unknown variable name
>> units : unknown
>> _FillValue : -999
>> grid_type : Latitude/longitude
>> parameter_discipline_and_category : Space products, Moisture
>> parameter_template_discipline_category_number : ( 30, 3, 1,
>> 98 )
>> initial_time : 05/13/2009 (00:00)
>>
>> float VAR_3_1_99_P30_GLL1 ( lat_1, lon_1 )
>> center : EUMETSAT Operation Centre
>> production_status : Operational test products
>> long_name : unknown variable name
>> units : unknown
>> _FillValue : -999
>> grid_type : Latitude/longitude
>> parameter_discipline_and_category : Space products, Moisture
>> parameter_template_discipline_category_number : ( 30, 3, 1,
>> 99 )
>> initial_time : 05/13/2009 (00:00)
>>
>> float lat_1 ( lat_1 )
>> long_name : latitude
>> grid_type : Latitude/Longitude
>> units : degrees_north
>> Dj : 95.97755
>> Di : 2.608696
>> Lo2 : 60
>> La2 : 60
>> Lo1 : -1e-06
>> La1 : -2147.484
>>
>> float lon_1 ( lon_1 )
>> long_name : longitude
>> grid_type : Latitude/Longitude
>> units : degrees_east
>> Dj : 95.97755
>> Di : 2.608696
>> Lo2 : 60
>> La2 : 60
>> Lo1 : -1e-06
>> La1 : -2147.484
>>
>> However, lat_0 and lon_0 are not displayed I assume they are entry 98
>> and 99. I also have tried using NCL_filedump from version 5.1.0 which
>> results in the following....
>>
>> 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: MPE_20090513_1500_M9_00
>> path: MPE_20090513_1500_M9_00.grb
>> file global attributes:
>> dimensions:
>> variables:
>>
>> Is NCL simply missing the necessary tables? Since I use NCL for most
>> image processing it would be quite helpful if I didn't have to convert
>> these files into some other format before reading them into NCL.
>>
>> Much appreciated!
>> Matt
>>
>> --
>> **********************************
>> Matthew A. Janiga
>> Department of Earth and Atmospheric Sciences, ES 330
>> University at Albany / State University of New York
>> 1400 Washington Avenue
>> Albany, NY 12222
>> PH: (847) 962-8397
>> Email: janiga_at_atmos.albany.edu
>> **********************************
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-- ********************************** Matthew A. Janiga Department of Earth and Atmospheric Sciences, ES 330 University at Albany / State University of New York 1400 Washington Avenue Albany, NY 12222 PH: (847) 962-8397 Email: janiga_at_atmos.albany.edu ********************************** _______________________________________________ ncl-talk mailing list List instructions, subscriber options, unsubscribe: http://mailman.ucar.edu/mailman/listinfo/ncl-talkReceived on Thu May 14 2009 - 13:32:56 MDT
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