[IDV #GZO-896323]: Fwd: [GODAE #10505]: Problem with FNMOC WW3 data

> Hi Yuan,
> I've encountered another problem - unrelated to plotting wave directions.
> Like the wave direction data, it also concerns some files from
> USGOSAE.org for data from the FNMOC WAVEWATCH III model.
> Files that I down loaded for the HEIGHT of wind waves (meters) were
> coming up as mean wave PERIOD of wind waves (seconds). I checked with
> the folks at USGODAE (see the email thread below) and they confirmed
> that the data is good. It appears that there's a problem when IDV goes
> to some table to retrieve the data type.
> From : http://www.wmo.int/pages/prog/www/WDM/Guides/Guide-binary-2.html
> 102   Significant height of wind waves        m
> 
> 103   Mean period of wind waves       s
> 
> 
> It appears IDV mistakenly thinks that 102 = Mean period of wind waves.
> 
Alan,

Let me know if you get the table and need help.


Yuan
> Can you confirm this?
> My goal here is to plot those wind wave directions on top of the wind
> wave height, but I'd like to do that with height in feet. It's hard to
> convert seconds to feet :), much easier to convert meters!
> 
> thanks,
> alan
> 
> Here's a data file:
> 
> http://www.usgodae.org/ftp/outgoing/fnmoc/models/ww3/2009/2009110800/US058GOCN-GR1mdl.0110_0240_00000F0RL2009110800_0001_000000-000000wnd_wav_ht
> 
> 
> 
> 
> -------- Original Message --------
> Subject:      [GODAE #10505]: Problem with FNMOC WW3 data
> Date:         Fri, 15 Apr 2011 11:09:39 -0700
> From:         GODAE Help <address@hidden>
> Reply-To:     GODAE Help <address@hidden>
> To:   <address@hidden>, <address@hidden>,
> <address@hidden>, <address@hidden>,
> <address@hidden>, <address@hidden>,
> <address@hidden>, <address@hidden>
> 
> 
> 
> I stand corrected.  IDV does read in GRIB files.  I had to rename it first to 
> give a .grib extension.  Afterwards, it read it in, and plot it.  Yes, it 
> claims for it to be mean_period_of_wind_waves@surface, which is not correct.
> 
> I think you should ping on the IDV group.
> 
> THanks,
> Mike
> 
> >  Hi Alan:
> >
> >  The data in question appears to be correct as hosted on USGODAE.  The 
> > parameter ID in the GRIB file is 102 which maps to 'significant height of 
> > wind waves' according to the WMO GRIB specifications.  I looked at the 
> > exact file that you referenced below.
> >
> >  IDV does not read in GRIB data directly.  You must be doing some type of 
> > conversion of the file, perhaps into another format like NetCDF for IDV to 
> > use it.  I am using version 2.9 of the IDV, perhaps there is a newer one 
> > that can use GRIB directly.
> >
> >  I am going to close off the ticket, since I believe that the data is ok.  
> > But, feel free to respond back, re-openening it if you feel otherwise.
> >
> >
> >  Thanks,
> >  Mike Frost
> >
> >  >  Hello again, Efren,
> >  >  I've attached a copy of a plot I made this morning, with a color scale
> >  >  similar to your's.
> >  >  I think that they're basically the same plot.
> >  >    From the legend, you can see that IDV thinks I'm plotting mean period
> >  >  for wind waves. It must be getting that info from some file header.
> >  >  The Max value on the plot is 4.9 seconds, an appropriate value for wind
> >  >  waves.
> >  >  I tried some other files from this and other days (including  from 2010)
> >  >  and they all display as wave period, not height. The max values were
> >  >  always in the range of 4-5 seconds.
> >  >
> >  >  Just to be sure we're looking at the same file, here's the url for the
> >  >  data file:
> >  >  
> > http://www.usgodae.org/ftp/outgoing/fnmoc/models/ww3/2009/2009110800/US058GOCN-GR1mdl.0110_0240_00000F0RL2009110800_0001_000000-000000wnd_wav_ht
> >  >
> >  >  A couple more observations:
> >  >  The file size for the wind wave height is double that for the wind wave
> >  >  period. Is that significant?
> >  >  Contours for wnd_wv_per and wnd_wv_ht are nearly identical - not
> >  >  unexpected, but a little curious.
> >  >
> >  >  alan
> >  >
> >  >  On 4/14/2011 5:20 PM, Serra, Mr. Efren, Contractor, Code 7542 wrote:
> >  >  >  Alan,
> >  >  >
> >  >  >  [serra@nrlgodae1 2009110800]$ wgrib -V 
> > US058GOCN-GR1mdl.0110_0240_00000F0RL2009110800_0001_000000-000000wnd_wav_ht
> >  >  >  rec 1:0:date 2009110800 WVHGT kpds5=102 kpds6=1 kpds7=0 levels=(0,0) 
> > grid=240 sfc anl: bitmap: 30390 undef
> >  >  >     WVHGT=Sig height of wind waves [m]
> >  >  >     timerange 0 P1 0 P2 0 TimeU 1  nx 360 ny 181 GDS grid 0 
> > num_in_ave 0 missing 0
> >  >  >     center 58 subcenter 0 process 110 Table 3
> >  >  >   latlon: lat  -90.000000 to 90.000000 by 1.000000  nxny 65160
> >  >  >             long 0.000000 to -1.000000 by 1.000000, (360 x 181) scan 
> > 64 mode 128 bdsgrid 1
> >  >  >     min/max data 0 4.92  num bits 16  BDS_Ref 0  DecScale 4 BinScale 0
> >  >  >
> >  >  >  [serra@nrlgodae1 2009110800]$
> >  >  >
> >  >  >  Above is output from wgrib.  I was wondering how you determined that 
> > it was wind wave PERIOD.  Also, I used grib2ctl.pl, gribmap, and gradsc and 
> > displayed the field.  Image attached.
> >  >  >
> >  >  >
> >  >  >  Efren A. Serra (Contractor)
> >  >  >  DeVine Consulting, Inc.
> >  >  >  Naval Research Laboratory
> >  >  >  Marine Meteorology Division
> >  >  >  7 Grace Hopper Ave., STOP 2
> >  >  >  Monterey, CA 93943
> >  >  >  Code 7542
> >  >  >  Office: 831-656-4650
> >  >  >  -----Original Message-----
> >  >  >  From: address@hidden [mailto:address@hidden]
> >  >  >  Sent: Thursday, April 14, 2011 2:50 PM
> >  >  >  To: Frost, Mr. Michael; Cook, Mr. John; Ignaszewski, Mr. Mark, Code 
> > 7542; Cummings, Dr. James; Serra, Mr. Efren, Contractor, Code 7542; 
> > Karengin, Mr. Dean, Contractor, Code 7501.1
> >  >  >Subject: [GODAE #10505]: Problem with FNMOC WW3 data
> >  >  >
> >  >  >  Sender:  address@hidden
> >  >  >  Date:  Thu Apr 14 21:49:55 UTC 2011
> >  >  >
> >  >  >  Message
> >  >  >  Hello,
> >  >  >  I recently down loaded some files that were supposed to be wind wave 
> > HEIGHT data. Instead, they had wind wave PERIOD date. I think the entire 
> > model run is corrupted like this.
> >  >  >
> >  >  >  Is it possible to get the correct data?
> >  >  >
> >  >  >  Here's the first file of the series(cl)
> >  >  >  
> > US058GOCN-GR1mdl.0110_0240_00000F0RL2009110800_0001_000000-000000wnd_wav_ht
> >  >  >
> >  >  >  thanks,
> >  >  >  Alan Bol
> >  >  >
> >  >  >
> >  >  >
> >  >  >
> >  >  >  DEBUG INFO
> >  >  >
> >  >  >  remote addr  128.117.107.155
> >  >  >  remote host  128.117.107.155
> >  >  >  remote ident
> >  >  >  remote user
> >  >  >  request method  POST
> >  >  >  referer  http://www.usgodae.org/contacts.html
> >  >  >  user agent  Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; 
> > rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16
> >  >  >
> >  >
> >  >  --
> >  >  Alan Bol
> >  >  Project Lead | Scientist | Instructional Designer
> >  >  The COMET Program | www.comet.ucar.edu
> >  >  303.497.8334 voice | 8491 fax
> >
> >
> 
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: GZO-896323
Department: Support IDV
Priority: Normal
Status: Closed