[ncl-talk] Plot Multi-Sensor Precipitation Estimate (MPE) from EUMETSAT

[David Brown]

I had a look at this file and I can say that the warning messages
apply as follows:

The file contains 2 variables which NCL names VAR_3_1_98_P30_GLL1 and
VAR_3_1_99_P30_GLL1. The first two warning messages say that NCL does
not know the name or units of these 2 variables, and thus gives the
variable name in terms of the parameter number, the product template,
the product discipline and the product category. The reason the names
are not known is because neither NCEP or ECMWF has assigned names or
units to these parameters yet. Presumably EUMETSAT knows what these
parameters mean, but for whatever reason, the names are not assigned
yet by WMO.
You may notice that these two variables are on a lat/lon grid, which
is given in the file, and they only contain 24 elements along each of
the dimensions.

The other variable, the one you are presumably interested in,
IRRATE_P30_GSV0, is on a satellite view projection grib. In this case,
NCL gives you the data, but the lat and lon locations of the data are
not given, because this projection is not yet fully supported, as the
message says. To view this data correctly using NCL you will need to
determine the lat lon locations using some external software or a file
with the lat/lon locations given. It is on our to-do list to support
this type of grid fully.
 -dave


On Thu, Nov 19, 2015 at 4:45 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca> wrote:
> Hello NCL users,
>
> I want to plot MPE data in GRIB2 from EUMETSAT, which can be found here :
> http://oiswww.eumetsat.int/~idds/html/grib.html
>
> When i dump the grib file i get the message below.
>
> What this is mean and is there a way or a typical script to plot this kind
> of data.
>
> Best regards,
> Rabah Hachelaf
>
>
> ncl_filedump MPE_20151119_1945_M10_00.grb | more
>  Copyright (C) 1995-2015 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.3.0
>  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
> /usr/local/ncl-6.3.0/lib/ncarg/grib2_codetables/ecmwf/4/4.2.3.1.table
> warning: Entry (99) not found in code table file
> /usr/local/ncl-6.3.0/lib/ncarg/grib2_codetables/ecmwf/4/4.2.3.1.table
> warning:NCL does not yet fully support GRIB2 space view perspective grid
> (template 90), no coordinate variables will be supplied for this grid
>
> Variable: f
> Type: file
> filename:       MPE_20151119_1945_M10_00
> path:   MPE_20151119_1945_M10_00.grb
>    file global attributes:
>    dimensions:
>       ygrid_0 = 3712
>       xgrid_0 = 3712
>       lat_1 = 24
>       lon_1 = 24
>    variables:
>       float IRRATE_P30_GSV0 ( ygrid_0, xgrid_0 )
>          center :       EUMETSAT Operation Centre
>          production_status :    Operational test products
>          long_name :    Instantaneous rain rate
>          units :        kg m-2s-1
>          _FillValue :   1e+20
>          grid_type :    Space view perspective or orthographic
>          parameter_discipline_and_category :    Space products, Quantitative
> products
>          parameter_template_discipline_category_number :        ( 30, 3, 1,
> 1 )
>          initial_time : 11/19/2015 (19:45)
>
>
>
>
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