20030725: 20030714: dcgrib help, followup

Seth,

Once you have a GEMPAK grid file, you can plot the
data using any of the "GD" programs in GEMPAK (see
Chapter 4 of the user guide:
http://my.unidata.ucar.edu/content/software/gempak/help_and_documentation/manual/chap4/index.php
or
the tutorial:
http://my.unidata.ucar.edu/content/software/gempak/tutorial/gridprogs.html

Use the NC decice driver for producing meta files for ntrans:
http://my.unidata.ucar.edu/content/software/gempak/tutorial/ntrans.html

For NMAP2 the file would typically be placed in the $MODEL data directory,
and referenced using a file template defined in $GEMTBL/config/datatype.tbl.
You can redefine $MODEL to point to a specif area for your project 
instead of real-time data.

Functions for the specific gridded data sets defined in datatype.tbl
are provided in $GEMTBL/nmap/mod_res.tbl.
For data files that are not the current data/tim, you would
set the appropriate time using the data selection pullup. A sample case study
data set shows use of non-real-time data with nmap2:
http://my.unidata.ucar.edu/modules.php?name=Downloads&d_op=viewsdownload&sid=19


Steve Chiswell



>From: "seth.mcdowell" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200307251758.h6PHwYLd013251

>Thank you for the previous help, though now there's another set of questions 
>arising. I have looked through the GemPak manual (version 5.6.g) for 
>information regarding the conversion of the resulting GemPak data file into a 
>form useful by programs such as nmap/nmap2 or ntrans, possibly other prorgams 
>as well.
>
>Seth McDowell
>
>
>>===== Original Message From Unidata Support <address@hidden> =====
>>Seth,
>>
>>Use dcgrib2 (use of dcgrib is depricated).
>>I unzipped your file, then ran:
>>cat pgbexample | dcgrib2 -v 1 -d - YYYYMMDDHH_###_@@@.gem
>>The above decoded 140 grids on NCEP grib #002 (2.5x2.5 degree global).
>>
>>Or....you can run nagrib, specifying the ncarncep1.tbl reanalysis parameter
>>tables as shown below.
>>
>> GBFILE    GRIB data file name               pgbexample
>> INDXFL    GRIB index file name
>> GDOUTF    Output grid file                  testme.gem
>> PROJ      Map projection/angles/margins|dr
>> GRDAREA   Area covered by grid
>> KXKY      Number of grid points in x;y
>> MAXGRD    Maximum number of grids           200
>> CPYFIL    Grid file whose navigation is to  gds
>> GAREA     Graphics area                     dset
>> OUTPUT    Output device/filename            t
>> GBTBLS    Input GRIB decoding tables        
>ncarncep1.tbl;ncarncep1.tbl;vcrdgrib1.tbl
>> GBDIAG    GRIB diagnostic elements
>> PDSEXT    PDSEXT    Y or N, add PDS extens  NO
>> Parameters requested: GBFILE,INDXFL,GDOUTF,PROJ,GRDAREA,KXKY,MAXGRD,CPYFIL,
>> GAREA,OUTPUT,GBTBLS,GBDIAG,PDSEXT.
>> GEMPAK-NAGRIB>
>>
>>
>>In general, using nagrib on the reanalysis files would be preferable since 
>you can
>>specify which parameters tables you want to use.
>>
>>Steve Chiswell
>>
>>
>>>From: "seth.mcdowell" <address@hidden>
>>>Organization: UCAR/Unidata
>>>Keywords: 200307142007.h6EK7jLd009408
>>
>>>Hello, I am a student at Western Kentucky University. Our center has gempak
>>>for us to use, and we have some NCEP-NCAR reanalysis data sets. I tried
>>>converting these with dcgrib, but to no avail. The grib files are not 
>supposed
>>>
>>>to be in gaussian mode, but perhaps they are?
>>>
>>>http://geocities.com/sethmcdoogle/pgb.zip is an example file.
>>>
>>>Thanks in advance,
>>>Seth McDowell
>>>
>>
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