[Met_help] [rt.rap.ucar.edu #42218] History for Point-Stat: Run time error

[RAL HelpDesk {for Paul Oldenburg}]

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  Initial Request
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Dear Sir,

I am a new MET user. I have successfully installed MET3.0 in my Linux system. Up to PB2NC it works well. But when I run point-stat, I am facing some problem. I have installed WRF post processing tool also. But I could not run it due to some segmentation fault error. So, I have converted the NETCDF output from WRF to the MET recognized format using P_INTERP. While running point-stat, it gives the following error:

./bin/point_stat /root/Desktop/WRF_desktop/P_INTERP/wrfout_d01_2010-09-24_00\:00\:00_PLEV tutorial/out/pb2nc/test.nc tutorial/config/PointStatConfig_test -outdir tutorial/out/point_stat -v 2

ERROR: PointStatConfInfo::process_config() -> When using a gridded NetCDF forecast file, "obs_field" cannot be blank.  You must specify the verifying observations using a GRIB code.

With this mail I am attching the configuration file. i am confused with the OBS_FIELD format also. Please have a look and help me out.


Thanking you

.............................................................

Rekha Bharali Gogoi

Scientist

NE-SAC,GOI,

Dept. of Space,

Umiam,Meghalaya.



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  Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #42218] Point-Stat: Run time error
From: Paul Oldenburg
Time: Thu Nov 18 10:33:24 2010

Rekha,

When using NetCDF input to point_stat, the obs_field must be
specified.  We realize that the comments saying that the
obs_field can be left blank might be misleading in this case.  First
of all, it might be worth your effort to get WRF
Post working and generate GRIB files to input to point_stat.  This
might be the easiest way to solve your problem, since
you would not have to worry about matching observations with model
data (MET would do it automatically).  If you have
trouble with WRF Post, please send an email to wrfhelp at ucar.edu.

If you decide to proceed using the p_interp NetCDF, you must build
obs_field settings for the observations that you want
to use for verification.  We see the following fcst_field settings in
the config file that you sent:

fcst_field[] = [ "QVAPOR(0,5,*,*)", "TT(0,5,*,*)", "UU(0,5,*,*)",
                 "VV(0,5,*,*)"];

To construct the corresponding obs_field settings, which use the GRIB-
esque format GC/PNNN, you need to do the following:

1.  Determine the pressure level(s) that correspond to level 5 in your
NetCDF arrays

2.  Determine the GRIB code for each of the NetCDF variables in the
fcst_fields.  Usually, TT is TMP, UU is UGRD and VV
is VGRD.  We do not know what type of observation to use with QVAPOR.
The following table might be useful:
http://www.nco.ncep.noaa.gov/pmb/docs/on388/table2.html.

In the end, your obs_field should look something like this, for
example:

fcst_field[] = [ "Q/P850", "TMP/P850", "UGRD/P850",
                 "VGRD/P850"];

If you have any other questions, please let us know.

Thanks,

Paul


On 11/18/2010 04:16 AM, RAL HelpDesk {for rekha bharali} wrote:
>
> Thu Nov 18 04:16:54 2010: Request 42218 was acted upon.
> Transaction: Ticket created by rekha_tu at yahoo.co.in
>        Queue: met_help
>      Subject: Point-Stat: Run time error
>        Owner: Nobody
>   Requestors: rekha_tu at yahoo.co.in
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=42218 >
>
>
> Dear Sir,
>
> I am a new MET user. I have successfully installed MET3.0 in my
Linux system. Up to PB2NC it works well. But when I run point-stat, I
am facing some problem. I have installed WRF post processing tool
also. But I could not run it due to some segmentation fault error. So,
I have converted the NETCDF output from WRF to the MET recognized
format using P_INTERP. While running point-stat, it gives the
following error:
>
> ./bin/point_stat /root/Desktop/WRF_desktop/P_INTERP/wrfout_d01_2010-
09-24_00\:00\:00_PLEV tutorial/out/pb2nc/test.nc
tutorial/config/PointStatConfig_test -outdir tutorial/out/point_stat
-v 2
>
> ERROR: PointStatConfInfo::process_config() -> When using a gridded
NetCDF forecast file, "obs_field" cannot be blank.  You must specify
the verifying observations using a GRIB code.
>
> With this mail I am attching the configuration file. i am confused
with the OBS_FIELD format also. Please have a look and help me out.
>
>
> Thanking you
>
> .............................................................
>
> Rekha Bharali Gogoi
>
> Scientist
>
> NE-SAC,GOI,
>
> Dept. of Space,
>
> Umiam,Meghalaya.
>
>


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