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?
Thanks,
Mike
--
Mike Zulauf
Meteorologist
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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