[gembud] viewing reanalysis data in nmap2. . .

Hi all. . .

I'm having a bit of a problem successfully viewing global reanalysis
data (NNRP) using nmap2.  I believe the problem is that I'm not
correctly handling the fact that the data is a series of analyses
(f000), rather than forecasts.

Here's what I'm doing.  First, I'm subsetting the original pgb grib
files using wgrib, so I'm creating grib files with just the variables I
want to convert.  Then I use dcgrib2 to convert these into monthly
gempak files with the fields I want.  It appears to me that the time
tags are getting entered correctly - at least when I use something like
gdinfo.  But nothing I do is letting me visualize the data in nmap2.

Here's an example of the output from gdinfo for PMSL, from a file
containing data for January 2009:
  NUM       TIME1              TIME2           LEVL1 LEVL2  VCORD PARM
   28     090101/0000F000                          0         NONE PMSL

   60     090101/0600F000                          0         NONE PMSL

   92     090101/1200F000                          0         NONE PMSL

  124     090101/1800F000                          0         NONE PMSL

  156     090102/0000F000                          0         NONE PMSL

  188     090102/0600F000                          0         NONE PMSL

  220     090102/1200F000                          0         NONE PMSL

  252     090102/1800F000                          0         NONE PMSL

  284     090103/0000F000                          0         NONE PMSL

  316     090103/0600F000                          0         NONE PMSL

  348     090103/1200F000                          0         NONE PMSL

  380     090103/1800F000                          0         NONE PMSL

  412     090104/0000F000                          0         NONE PMSL

  444     090104/0600F000                          0         NONE PMSL

  476     090104/1200F000                          0         NONE PMSL

  508     090104/1800F000                          0         NONE PMSL

(etc etc)

We're editing the table files for nmap2, and what is currently happening
is that _all_ of the times show up in the "Data Source" dialog window,
as if they were separate "forecasts" in separate gem files.  But if I
select any of them, I can't get any of them to display - and in reality
there is only a single gem file that contains all those times.  And I
can successfully plot the data using gdcntr/gdplot/etc.

I'm thinking maybe what I should do is somehow convince nmap2 that each
month is a single "forecast" (even though they are really all analyses),
with the first time being labeled as f000, 6 hours later as f006, 12
hours later as f012, etc, etc.

But I don't know how to go about doing that - or even if that is the
best approach.  Is there any utility that will let me change the time
tags in a gem file?

Any thoughts?


Mike Zulauf
Wind Asset Management 
Iberdrola Renewables
1125 NW Couch, Suite 700
Portland, OR 97209
Office: 503-478-6304  Cell: 503-913-0403

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