Hi Peter,
To covert the pressure to AGL using GDVINT I think you need to add the surface
file to the NARR first. You can download the surface file from the NOMADS site
(http://nomads.ncdc.noaa.gov/data/narr). It is called AWIPS32-fixed.grb.
Convert that to GEMPAK and then add it to the NARR GEMPAK file and then try to
convert it. I'm not 100 percent that will work, but it worked for me when I got
that same error.
Josh
On Oct 4, 2012, at 9:38 AM, Peter Banacos <Peter.Banacos@xxxxxxxx> wrote:
> All:
>
> I'm trying to convert NARR gem files from pressure to height (agl)
> coordinates using GDVINT. I've tried various combinations for VCOORD
> but I always receive the same error about "required surface elevation is
> absent". When I downloaded the grib files, I selected all variables.
> Here is some sample output:
>
> GEMPAK-GDVINT>display
> GDFILE Grid file 20100128_1800.gem
> GDOUTF Output grid file 20100128_1800z.gem
> GDATTIM Grid date/time f00
> GVCORD Grid vertical coordinate pres/zagl
> GLEVEL Grid level 500-10000-500
> MAXGRD Maximum number of grids 999
> GAREA Graphics area grid
> VCOORD Vertical coordinate type pres;none
> GEMPAK-GDVINT>r
> PRES found.
> TMPK found.
> HGHT found.
> SPFH found.
> OMEG found.
> UWND found.
> VWND found.
> TKE found.
> CLWMR found.
> ICMR found.
> MCONV found.
> LFTX found.
> [GDVINT 4] Warning--no surface elevation grid exists.
> [GDVINT -7] Required surface elevation is absent.
> Parameters requested: GDFILE,GDOUTF,GDATTIM,GVCORD,GLEVEL,MAXGRD,GAREA,
> VCOORD.
> Does anyone have any experience converting NARR to height AGL coordinates?
> Thanks in advance.
>
> --
> Peter C. Banacos, Lead Forecaster
> NOAA/National Weather Service
> WFO Burlington, VT
> weather.gov/btv
> E-mail: peter.banacos@xxxxxxxx
> Phone: (802) 862-2475
>
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