[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20041201: GEMPAK trouble with non-standard domain

Brian,

The dcgrib decoder is depricated in favor of dcgrib2,
so I'll suggest you use that.

Also, it would help to look at the gdinfo output for
the grid navigation and projection used in the GEMPAK file
which is created by the decoder. It sounds as if the navigation in the
file is not as expected, or doesn't match the PROJ and GAREA you provided
for GDCNTR. Note that you can use PROJ=def and GAREA=grid.

In general, if the GDS block of the grib provides the navigation,
then that is used instead of any found in $GEMTBL/grid/grdnav.tbl.
Dcgrib2 should have no trouble with this in any regard.

One possibility of confusion for dcgrib (not dcgrib2) would be if the 
grid was displaced, but it still used the grid #252 projection number 
in the grib PDS block.

Steve Chiswell
Unidata User Support





>From: Brian Jamison <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200412012035.iB1KZMlI011579

>Hello!
>
>I am a new user of GEMPAK, and have been through the
>on-line tutorial.  I am interested in using GEMPAK to look
>at particular fields in the RUC 20km model.
>
>Here is my problem:  we have some RUC forecasts that
>were generated over a displaced area, namely over the
>Pacific just northwest of Hawaii.  All other aspects of the
>forecasts are identical to a RUC run over the CONUS, the
>only difference is the domain.
>
>I (apparently) successfully created the GEMPAK format file
>from the RUC GRIB file using the DCGRIB decoder, however
>I am getting errors when trying to create plots using this file.
>The errors are as follows:
>
>  GEMPAK-GDCNTR>r
>Creating process: xw for queue 502
>  [GEMPLT -16]  NIPBND - Invalid projection bounds.
>  [GR -7]  Error defining grid navigation in GEMPLT.
>  [DG -30]  Error opening grid file.
>
>I set the parameters for PROJ and GAREA to reflect the position
>of the displaced domain, but still get these errors.
>
>What can I do to get around this?  Any help you can give is
>greatly appreciated.
>
>
>Brian Jamison
>
>
--
NOTE: All email exchanges with Unidata User Support are recorded in the
Unidata inquiry tracking system and then made publicly available
through the web.  If you do not want to have your interactions made
available in this way, you must let us know in each email you send to us.