20050506: NGRID feed and gempak

>From: Clint Rowe <address@hidden>
>Organization: University of Nebraska Geosciences
>Keywords: 200505061746.j46Hk3P3003614

>Chiz,
>
>What do I need to do to decode the NAM and DGEX products on NGRID?
>Di you have an example pqact.conf entry and do I need to make
>changes to my gribkey.tbl?
>
>Sure, I could figure this out on my own, but I'm being lazy ...
>
>Clint
>-- 
>====================================================================
>Clinton M. Rowe
>Associate Professor
>Meteorology/Climatology Program                  phone:(402)472-1946
>Department of Geosciences                          fax:(402)472-4917
>University of Nebraska-Lincoln                        address@hidden
>

Clint,

Are you running 5.8.1? The entries are in the pqact.gempak_decoders
and gribkey.tbl files.

In pqact.gempak_decoders, you should have lines such as:
# ETA/NAM model output
# -------------------
# NOAAport ETA grids
# Grid #211 80km CONUS:    ^[YZ].Q.*/m(ETA|NAM)
# Grid #212 40km CONUS:    ^[YZ].R.*/m(ETA|NAM)
# Grid #214 47.5km Alaska: ^[YZ].T.*/m(ETA|NAM)
# Grid #215 20km CONUS:    ^[YZ].U.*/m(ETA|NAM)
# Grid #216 45km Alaska:   ^[YZ].V.*/m(ETA|NAM)
# Grid #217 22.5km Alaska: ^[YZ].Y.*/m(ETA|NAM)
# Grid #218 12km CONUS:    ^[YZ].B.*/m(ETA|NAM)
# Grid #242 11.25km Alaska:^[YZ].S.*/m(ETA|NAM)
# Select any/all grids desired from [QRTUVYBS]
#
# CONDUIT ETA grids
# Grid #104 (90km):     MT.(eta|nam).*#104
# Grid #212 (40km):     MT.(eta|nam).*#212
# Grid #215 (20km):     MT.(eta|nam).*#215
# Grid #216 (45km):     MT.(eta|nam).*#216
# Grid #218 (12km):     MT.(eta|nam).*#218
#
# DVB-S NOAAPORT
# Grid #218 (12km CONUS grib2): ^[LM].B... KWBE.*#218
# Grid #242 (11.25km Alaska grib2): ^[LM].S... KWBE.*#242
HDS|CONDUIT|NGRID       (/mETA|/mNAM|MT.eta|MT.nam|^[LM]..... KWBE)
        PIPE    decoders/dcgrib2 -d data/gempak/logs/dcgrib2_ETA.log
                -e GEMTBL=@GEMTBL@

Then further down in the file:

# DGEX Grid 185 CONUS 12km
NGRID   ^[LM].E... KWBD ([0-3][0-9])([0-2][0-9][0-6][0-9])
        PIPE    decoders/dcgrib2 -m 200 -d data/gempak/logs/ngrib.log
        -e GEMTBL=@GEMTBL@
        data/gempak/model/dgex/YYYYMMDDHHfFFF_dgex.gem
#
# DGEX Grid 186 Alaska 12km
NGRID   ^[LM].F... KWBD ([0-3][0-9])([0-2][0-9][0-6][0-9])
        PIPE    decoders/dcgrib2 -d data/gempak/logs/ngrib.log
        -e GEMTBL=@GEMTBL@
        data/gempak/model/dgex-ak/YYYYMMDDHHfFFF_dgex.gem

The first will capture the NGRID products "^[LM].* KWBE" which will
comprise the ETA/NAM 218 and 242 alaska grids.
The 2 DGEX entries are self explanatory.

The gribkey.tbl lines for eta218 and eta242 are:
007   x   084,085   218    data/gempak/model/eta12km/YYYYMMDDHHfFFF_eta@@@.gem  
1000
007   x   084,085   242    data/gempak/model/eta-ak/YYYYMMDDHHfFFF_eta@@@.gem   
1000


I'm storing these files using the FFF template because they can get big in a 
single file.
In the datatype.tbl file:
ETA218       $MODEL/eta12km            YYYYMMDDHHfFFF_eta218.gem CAT_GRD  
SCAT_FCT   -1     -1     -1      OFF/0/0
ETA_AK       $MODEL/eta-ak             YYYYMMDDHHfFFF_eta.gem    CAT_GRD  
SCAT_FCT   -1     -1     -1      OFF/0/0

! DGEX
DGEX         $MODEL/dgex               YYYYMMDDHHfFFF_dgex.gem   CAT_GRD  
SCAT_FCT   -1     -1     -1      OFF/0/0
DGEX_AK      $MODEL/dgex-ak            YYYYMMDDHHfFFF_dgex.gem   CAT_GRD  
SCAT_FCT   -1     -1     -1      OFF/0/0


If you are running 5.8.1, then the "OFF/" string isn't there in the lines 
above, but will be added in 5.8.2.
If your table is pre5.8.1, thenb the "0/0" horizontal remapping isn't there 
either.

Chiz



Steve Chiswell
Unidata User Support


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