[ncl-talk] ncl_filedump question

[Dennis Shea]

Jim

NCL 6.3.0 handles the WRF grib2 file just fine [well,  99%].

%> *ncl_filedump* 1807190600_wrfout_arw_d02.grb2  *| less*

There is only *one initial time*  and *one forecast time* on the file. If
you want single dimension included in the dimensioning:

%> *ncl_filedump* 1807190600_wrfout_arw_d02.grb2 *-itime* *-ftime*  *| less*

%> *ncl_filedump* 1807190600_wrfout_arw_d02.grb2 *-itime* *-ftime*   >&!
out.*630_itime_ftime*.1807190600_wrfout_arw_d02

Within an NCL script:
https://www.ncl.ucar.edu/Document/Functions/Built-in/setfileoption.shtml

   *setfileoption*("grb","SingleElementDimensions","Initial_time")
or
   *setfileoption*("grb","SingleElementDimensions",
(/"Initial_time","Forecast_time"/))


===
I have also tried the recently released 6.5.0

You get the exact same result.

===
NOTE:


[a]  Some of the descriptive attributes:

      float *REFC_P8_L10_GLC0_max30min* ( initial_time0_hours, ygrid_0,
xgrid_0 )
         center :       US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    Composite reflectivity
         units :        dB
         _FillValue :   1e+20
         coordinates :  gridlat_0 gridlon_0
         grid_type :    Lambert Conformal can be secant or tangent, conical
or bipolar
         parameter_discipline_and_category :    Meteorological products,
Forecast radar imagery
         parameter_template_discipline_category_number :        ( 8, 0, 16,
5 )
         level_type :   Entire Atmosphere
         level :         0

*         type_of_statistical_processing :       Maximum
statistical_process_duration : 30 minutes (ending at forecast time)*
         forecast_time :        780
         forecast_time_units :  minutes

[b]

*Warning messages*


*The variables are unpacked correctly!!*
NCL uses look-up tables to match-up parameter id numbers with information
such as lon_name, units, etc.
Unfortunately, GRIB is a moving target and NCL developers are not privy to
information or it is just not publicly available.

So, for example:

*warning: Entry (243)* not found in code table file
/Users/shea/devel/ncl/lib/ncarg/grib2_codetables/ncep/4/4.2.0.1.table
NCL unpacks the variables and creates the appropriate dimension names. It
just does not have the needed lookup info.

      float *VAR*_0_1_*243*_P0_L1_GLC0 ( initial_time0_hours, ygrid_0,
xgrid_0 )
         center :       US National Weather Service - NCEP (WMC)
         production_status :    Operational products
         long_name :    unknown variable name
         units :        unknown
         _FillValue :   1e+20
         coordinates :  gridlat_0 gridlon_0
         grid_type :    Lambert Conformal can be secant or tangent, conical
or bipolar
         parameter_discipline_and_category :    *Meteorological products,
Moisture*
         parameter_template_discipline_category_number :        ( 0, 0, 1,
243 )
         level_type :  * Ground or water surface*
         level :         0
         forecast_time :        780
         forecast_time_units :  minutes

HTH
D


On Thu, Jul 19, 2018 at 2:26 PM, Jim Means <jim at weatherextreme.com> wrote:

> Hello,
>
> I am trying to find out what's inside a grib2 file created by WRF, and I'm
> attempting to use ncl_filedump to find out the details. I'm running
> ncl_filedump with no options:
>
> ncl_filedump 1807190600_wrfout_arw_d02.grb2
>
> and I get
>
> fatal:NclGRIB2: Invalid Product Definition Template.
>
> Variable: f
> Type: file
> (0) File Missing Value : -1
>
> What am I doing wrong?
>
>
> Thanks,
>
> Jim
> --
>
> James D. Means, Ph.D.
> Senior Atmospheric & Climate Scientist
> California Office
> Tele: 619-495-1638 | Fax: 775-636-8430
> 930 Tahoe Blvd., Suite 802-560
> Incline Village, Nevada 89451
> jim at weatherextreme.com | vcard
> <http://www.weatherextreme.com/vcards/James%20Means.vcf>
> www.weatherextreme.com
> <http://www.weatherextreme.com/>
>
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