RE: NMAP Loops (#1562)

• To: Charley Knoderer <charley@xxxxxxxxxxxxxx>
• Subject: RE: NMAP Loops (#1562)
• From: Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
• Date: Tue, 20 Feb 2007 12:30:11 -0700

Charley,

Make sure you are decoding using the dcgrib2 program from 5.9.4 and not 5.7.3. 
As I mentioned before, NCEP changed one byte of the grib headers that changed 
the F000 meaning to an analysis time - so the 5.7.3 version would be decoding 
these initial times as YYMMDD/HHNN rather than YYMMDD/HHNNf000.

You should be able to see the grid times in the file if you fill out the 
entries in gdinfo rather than leaving blank.

Try
GDATTIM = fall
GLEVEL = all
GVCORD = all
GFUNC = all

or:

at the gdinfo prompt type: restore defaults/gdinfo

Steve Chiswell
Unidata User Support


On Mon, 2007-02-19 at 15:48 -0800, Charley Knoderer wrote:

Hi,

Here's the listing I get off of gdinfo:

 GEMPAK-GDINFO>l
 GDFILE   = 07021918_nam_212.gem
 LSTALL   = YES

OUTPUT GDATTIM = all GLEVEL GVCORD GFUNC GEMPAK-GDINFO>r

 GRID FILE: 07021918_nam_212.gem

 GRID NAVIGATION:
     PROJECTION:          LCC
     ANGLES:                25.0   -95.0    25.0
     GRID SIZE:          185 129
     LL CORNER:              12.19   -133.46
     UR CORNER:              57.29    -49.39

 GRID ANALYSIS BLOCK:
     ANALYSIS TYPE:        BARNES
     DELTAN:               4.000
     DELTAX:           -9999.000
     DELTAY:           -9999.000
     GRID AREA:            11.00 -154.00   62.00  -48.00
     EXTEND AREA:          11.00 -154.00   62.00  -48.00
     DATA AREA:            11.00 -154.00   62.00  -48.00

 Number of grids in file:  9210

 Maximum number of grids in file:  29999

 [GDU 2]  Did not find any matching grids.
 Parameters requested: GDFILE,LSTALL,OUTPUT,GDATTIM,GLEVEL,GVCORD,GFUNC.

To add further confusion to the matter, we have one machine running
gempak 5.7.3 and it displays the first time period in nmap, but only the
first time period.  On a separate machine, we are running gempak 5.9.4
and reading the decoded grib from 5.7.3 and nmap will not read these
files at all.

Any suggestions?

Thanks,
Charley

• References:
  • RE: NMAP Loops (#1562)
    • From: Charley Knoderer