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20021114: oabsfc, first guess and sfparm=pany
- Subject: 20021114: oabsfc, first guess and sfparm=pany
- Date: Thu, 14 Nov 2002 10:27:19 -0700
Christian,
To use a first guess field, the parameter name must exist in
the grid file as it is being gridded in the surface file.
Since you are gridding PANY from the surface file, you need a
pressure grid of "PANY" in your grid file. You can use the gddiag
program to rename the grid with GFUNC=PMSL and GRDNAM=PANY.
You may also need to specify the gdattim fully in the GUESS parameter,
eg GUESS=file*021114/0000f000
Steve Chiswell
>From: =?ISO-8859-1?Q?Christian_Pag=E9?= <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200211141400.gAEE03L22185
>Hi,
>
>I am trying to do a Barnes surface analysis using sfparm=pany but with
>a first guess file using model data.
>The problem is that it seems that for first guess, using sfparm=pany
>doesn't work. I must use pany because in Europe altm is used to report
>mean sea-level pressure (except pmsl for buoys and boats). In oabsfc,
>using sfparm=pmsl doesn't work because oabsfc doesn't find enough data
>in the surface file (but first guess data is found), while using
>sfparm=altm (or pany) is not working because oabsfc doesn't find the
>first guess data... Here is the output:
>
>(avn.grid has been create with oagrid the same way europe_surf.grid
>file was created)
>
>246 [/io/httpd/gempak/ff] % gdbiint
> GDFILE Grid file 2002111400_avn201.gem
> GDOUTF Output grid file avn.grid
> GFUNC Scalar grid pmsl
> GLEVEL Grid level 0
> GVCORD Grid vertical coordinate none
> GDATTIM Grid date/time all
GDNUM Grid numbers
> Parameters requested: GDFILE,GDOUTF,GFUNC,GLEVEL,GVCORD,GDATTIM,GDNUM.
> GEMPAK-GDBIINT>gdattim=f012
> GEMPAK-GDBIINT>r
> Building interpolation array for 103 columns 72 rows
> Input grid file contains 451 grids
> Interpolating PMSL 021114/0000F012 0 -1 NONE
> Parameters requested: GDFILE,GDOUTF,GFUNC,GLEVEL,GVCORD,GDATTIM,GDNUM.
> GEMPAK-GDBIINT>e
>
>
>WITH SFPARM=pany
>---------------------------
>248 [/io/httpd/gempak/ff] % oabsfc
> SFFILE Surface data file
>/io/ldm/data/gempak/surface/sao/20021114_sao.gem
> GDFILE Grid file 2002111400_avn201.gem
> SFPARM Surface parameter list pany
> DATTIM Date/time 13
> DTAAREA Data area for OA 16;-30;72;50
> GUESS Guess file*time europe_surf.grid
> GAMMA Convergence parameter 0.3
> SEARCH Search radius/Extrapolation 20
> NPASS Number of passes 2
> QCNTL Quality control threshold
> Parameters requested: SFFILE,GDFILE,SFPARM,DATTIM,DTAAREA,GUESS,GAMMA,
> SEARCH,NPASS,QCNTL.
> GEMPAK-OABSFC>gdfile=europe_surf.grid
> GEMPAK-OABSFC>dattim=12
> GEMPAK-OABSFC>dattim=13
> GEMPAK-OABSFC>guess=avn.grid*f012
> GEMPAK-OABSFC>r
> [OABSFC 6] WARNING: Area is not DATA area in file.
> 2 duplicate stations eliminated.
>
> OABSFC PARAMETERS:
>
> Output grid file: europe_surf.grid
> Number of x, y points: 103 72
> Grid bnds: 16.00 -30.00 71.38 49.56 Grid xtnd: 2 2
>2 2
> Station spacing: 1.57
> Guess grid file: avn.grid
> Guess time: f012
> Surface file:
>/io/ldm/data/gempak/surface/sao/20021114_sao.gem
> Data area: 16;-30;72;50
> Parameters: PANY
> QC threshold: 0.0
> Time: 021114/1300
> GAMMA: 0.30 SEARCH: 20.00 NPASS: 2
> No data extrapolation will occur.
>Enter <cr> to accept parameters or type EXIT:
>
> Processing data at time 021114/1300
> [DG -7] Input grid ... cannot be found.
> [OA -5] Guess grid could not be found.
> Parameters requested: SFFILE,GDFILE,SFPARM,DATTIM,DTAAREA,GUESS,GAMMA,
> SEARCH,NPASS,QCNTL.
>
>WITH SFPARM=pmsl
>---------------------------
>253 [/io/httpd/gempak/ff] % oabsfc
> SFFILE Surface data file
>/io/ldm/data/gempak/surface/sao/20021114_sao.gem
> GDFILE Grid file europe_surf.grid
> SFPARM Surface parameter list pany
> DATTIM Date/time 13
> DTAAREA Data area for OA 16;-30;72;50
> GUESS Guess file*time avn.grid*f012
> GAMMA Convergence parameter 0.3
> SEARCH Search radius/Extrapolation 20
> NPASS Number of passes 2
> QCNTL Quality control threshold
> Parameters requested: SFFILE,GDFILE,SFPARM,DATTIM,DTAAREA,GUESS,GAMMA,
> SEARCH,NPASS,QCNTL.
> GEMPAK-OABSFC>sfparm=pmsl
> GEMPAK-OABSFC>r
> [OABSFC 6] WARNING: Area is not DATA area in file.
> [OABSFC -7] There are too few stations in data subset area.
> [OABSFC 9] No data from
>/io/ldm/data/gempak/surface/sao/20021114_sao.gem will be used.
> [OABSFC -9] No valid parameters have been entered.
> Parameters requested: SFFILE,GDFILE,SFPARM,DATTIM,DTAAREA,GUESS,GAMMA,
> SEARCH,NPASS,QCNTL.
>
>WITH SFPARM=altm
>---------------------------
> GEMPAK-OABSFC>sfparm=altm
> GEMPAK-OABSFC>r
> [OABSFC 6] WARNING: Area is not DATA area in file.
> 2 duplicate stations eliminated.
>
> OABSFC PARAMETERS:
>
> Output grid file: europe_surf.grid
> Number of x, y points: 103 72
> Grid bnds: 16.00 -30.00 71.38 49.56 Grid xtnd: 2 2
>2 2
> Station spacing: 1.57
> Guess grid file: avn.grid
> Guess time: f012
> Surface file:
>/io/ldm/data/gempak/surface/sao/20021114_sao.gem
> Data area: 16;-30;72;50
> Parameters: ALTM
> QC threshold: 0.0
> Time: 021114/1300
> GAMMA: 0.30 SEARCH: 20.00 NPASS: 2
> No data extrapolation will occur.
>Enter <cr> to accept parameters or type EXIT:
>
> Processing data at time 021114/1300
> [DG -7] Input grid ... cannot be found.
> [OA -5] Guess grid could not be found.
> Parameters requested: SFFILE,GDFILE,SFPARM,DATTIM,DTAAREA,GUESS,GAMMA,
> SEARCH,NPASS,QCNTL.
>
>
>Is there something I am missing to make it work?
>
>Thanks again,
>
>Christian Pagé
>address@hidden
>http://meteocentre.com/ http://meteoalerte.com/
>
>Etudiant au Doctorat en Sciences de l'environnement UQAM
>+1 514 987 3000 ext. 2376
>