Re: Reading Meteosat MPE in GRIB2

From: Matthew Janiga <matthew.janiga_at_nyahnyahspammersnyahnyah>
Date: Thu, 14 May 2009 14:09:10 -0400

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
**********************************
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Received on Thu May 14 2009 - 12:09:10 MDT

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