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20000417: XCD grid decoding problems at UVa (final)



>From: Anthony James Wimmers <address@hidden>
>Organization: UVa
>Keywords: 200004091534.JAA08082 XCD DMGRID ETA MRF FTP backup RTMODELS.CFG 
>NOGRIB.CFG GRIBDEC.CFG HRS.CFG RESOLV.SRV DECINFO

Tony,

>I'll get to work on your instructions once I know how to do this:
>
>> o install two new tables used by dmgrid.k:  gbtbpds001.a74v1 and
>>   gbtbpds001.a98v1.  This gets around having to ever modify gbtbpds001.av1
>>   for ECMWF model ID changes (yahoo!).

I already did this on your system.  The only things that were possibly
left undone were:

o reducing the size of your HRS spool file; 128 MB is almost 100% for
  sure overkill

o changing how ETA grids are stored _IF_ you want to have each model
  run in a separate file

The previous email had the instructions for the former; the following
covers the latter:

I changed how ETA grids are stored here at Unidata as an experiment.
I am now storing each ETA model run (0, 6, 12, and 18 Z) in separate
files.  The RTMODELS.CFG entries that I am currently using are:

# History: 20000403 - Changed ETA grid filing format (3 -> 1) in order to
#                       file grids out to 60 hours (March 29, 2000 NWS change)
#                     Moved start of NGM grids to 5501
#          20000415 - Moved NGM grids start to 5011; moved ETA grids start
#                       to 5501; changed ETA filing to reflect runs at
#                       0, 6, 12, and 18 Z

SCRATCH=5001
NGM=  3 5011 120000 240000 480000
MRF=  1 5101 120000 240000 960000
MAPS= 0 5201  30000
MDR=  2 5301
# RCM=  2 5311
AVN=  3 5401 120000 240000 720000
ETA=  1 5501  60000 240000 480000

You will note that I:

o moved NGM grids to start at 5011

o moved ETA grids to start at 5501

o changed the interval between model runs for the ETA from 120000 to 60000

A listing of how my grids look after this change follows:

 grdlist.k RTGRIDS/ALL.ALL FORM=FILE
DATASET NAME: RTGRIDS/ALL
 Dataset Position  Creation Date Max Grids         Directory Title
 ----------------  ------------- --------- -------------------------------
        7             2000107       5000   Misc. Grids for 16 APR 2000
        8             2000108       5000   Misc. Grids for 17 APR 2000
       17             2000107       5000   ALL  00Z NGM 0  HR<=VT<=24 HR
       18             2000108       5000   ALL  00Z NGM 0  HR<=VT<=24 HR
       27             2000107       5000   ALL  00Z NGM 24 HR< VT<=48 HR
       28             2000108       5000   ALL  00Z NGM 24 HR< VT<=48 HR
       37             2000107       5000   ALL  12Z NGM 0  HR<=VT<=24 HR
       38             2000108       5000   ALL  12Z NGM 0  HR<=VT<=24 HR
       47             2000107       5000   ALL  12Z NGM 24 HR< VT<=48 HR
       48             2000108       5000   ALL  12Z NGM 24 HR< VT<=48 HR
      107             2000107       5000   ALL  00Z MRF 0  HR<=VT<=24 HR
      108             2000108       5000   ALL  00Z MRF 0  HR<=VT<=24 HR
      117             2000107       5000   ALL  00Z MRF 24 HR< VT<=48 HR
      118             2000108       5000   ALL  00Z MRF 24 HR< VT<=48 HR
      127             2000107       5000   ALL  00Z MRF 48 HR< VT<=72 HR
      128             2000108       5000   ALL  00Z MRF 48 HR< VT<=72 HR
      137             2000107       5000   ALL  00Z MRF 72 HR< VT<=96 HR
      138             2000108       5000   ALL  00Z MRF 72 HR< VT<=96 HR
      147             2000107       5000   ALL  00Z MRF > 96  HR
      148             2000108       5000   ALL  00Z MRF > 96  HR
      207             2000107       5000   ALL  00Z MAPS
      208             2000108       5000   ALL  00Z MAPS
      217             2000107       5000   ALL  03Z MAPS
      218             2000108       5000   ALL  03Z MAPS
      227             2000107       5000   ALL  06Z MAPS
      228             2000108       5000   ALL  06Z MAPS
      237             2000107       5000   ALL  09Z MAPS
      238             2000108       5000   ALL  09Z MAPS
      247             2000107       5000   ALL  12Z MAPS
      248             2000108       5000   ALL  12Z MAPS
      257             2000107       5000   ALL  15Z MAPS
      258             2000108       5000   ALL  15Z MAPS
      267             2000107       5000   ALL  18Z MAPS
      277             2000107       5000   ALL  21Z MAPS
      307             2000107         24   MDR data for 16 APR 2000
      308             2000108         24   MDR data for 17 APR 2000
      317             2000107       5000   ALL  RCM
      407             2000107       5000   ALL  00Z AVN 0  HR<=VT<=24 HR
      408             2000108       5000   ALL  00Z AVN 0  HR<=VT<=24 HR
      417             2000107       5000   ALL  00Z AVN 24 HR< VT<=48 HR
      418             2000108       5000   ALL  00Z AVN 24 HR< VT<=48 HR
      427             2000107       5000   ALL  00Z AVN 48 HR< VT<=72 HR
      428             2000108       5000   ALL  00Z AVN 48 HR< VT<=72 HR
      437             2000107       5000   ALL  12Z AVN 0  HR<=VT<=24 HR
      438             2000108       5000   ALL  12Z AVN 0  HR<=VT<=24 HR
      447             2000107       5000   ALL  12Z AVN 24 HR< VT<=48 HR
      448             2000108       5000   ALL  12Z AVN 24 HR< VT<=48 HR
      457             2000107       5000   ALL  12Z AVN 48 HR< VT<=72 HR
      507             2000107       5000   ALL  00Z ETA 0  HR<=VT<=24 HR
      508             2000108       5000   ALL  00Z ETA 0  HR<=VT<=24 HR
      517             2000107       5000   ALL  00Z ETA 24 HR< VT<=48 HR
      518             2000108       5000   ALL  00Z ETA 24 HR< VT<=48 HR
      527             2000107       5000   ALL  00Z ETA > 48  HR
      528             2000108       5000   ALL  00Z ETA > 48  HR
      537             2000107       5000   ALL  06Z ETA 0  HR<=VT<=24 HR
      538             2000108       5000   ALL  06Z ETA 0  HR<=VT<=24 HR
      547             2000107       5000   ALL  06Z ETA 24 HR< VT<=48 HR
      548             2000108       5000   ALL  06Z ETA 24 HR< VT<=48 HR
      567             2000107       5000   ALL  12Z ETA 0  HR<=VT<=24 HR
      568             2000108       5000   ALL  12Z ETA 0  HR<=VT<=24 HR
      577             2000107       5000   ALL  12Z ETA 24 HR< VT<=48 HR
      578             2000108       5000   ALL  12Z ETA 24 HR< VT<=48 HR
      587             2000107       5000   ALL  12Z ETA > 48  HR
      588             2000108       5000   ALL  12Z ETA > 48  HR
      597             2000107       5000   ALL  18Z ETA 0  HR<=VT<=24 HR
      607             2000107       5000   ALL  18Z ETA 24 HR< VT<=48 HR
GRDLIST - done

You can see from this listing that storing the ETA grids in run time
specific files results in 120 GRID file names being used.

In order to access the data stored in this new way, I also had to modify
my RESOLV.SRV file (the one used by the remote ADDE server):

N1=RTGRIDS,N2=ALL,TYPE=GRID,RT=Y,K=GRID,R1=5001,R2=6000,C=All XCD Real-Time 
Grids,
N1=RTGRIDS,N2=ETA,TYPE=GRID,RT=Y,K=GRID,R1=5501,R2=5620,C=Real-Time ETA Grids,
N1=RTGRIDS,N2=NGM,TYPE=GRID,RT=Y,K=GRID,R1=5011,R2=5050,C=Real-Time NGM Grids,

If you choose to _not_ follow the above example, you need do nothing.

Tom