[Met_help] Mode tool

[John Halley Gotway]

Seagayle,

You're definitely not the first person to be frustrated by lack of good documentation for the copygb tool!  I've attached a file named "copygb.doc" which does give some info about running copygb, but
not much.  A copy of this file should be included in the source code directory of WPP.

What we'll need to do is figure out the parameters that define your forecast 77 x 69 grid.  If your forecast data was postprocessed using WPP, then copygb was probably run on it at some point in the
processing - perhaps by some script file.  If that's the case, and you can find the copygb command that was used with your forecast data, that would indicate the arguments you'd need for copygb.

But it may be easier for you to just send me a sample GRIB forecast file.  I'll extract the grid definition information from it and let you know how to run copygb on your obs data to regrid it.

So please send me 1 sample forecast and 1 sample observation file (so I can check to make sure the copygb arguments I put together are correct).  If the files are too big for email, you could post
them to our anonymous ftp site with the following commands:

cd "directory containing forecast and observation files"
ftp ftp.rap.ucar.edu
username: anonymous
password: "fill in your email address here"
cd incoming/irap/johnhg
put "name of the forecast file"
put "name of the observation file"
bye

Thanks,
John

walford02 at hotmail.com wrote:
> John,
> 
> I do have copygb because I have WRF Post-Processor, but I am not familiar
> with it. I want my observations to be placed on the model forecast domain
> and to be honest  it is not clear how I do this.
> 
> My forecast grid dimensions are 77, 69 and my observation  ( NCEP/EMC U.S.
> Gridded Multi-Sensor Precipitation (4 km) [NCAR/EOL]) grid dimensions are
> 1121, 881. How do I use copygb to change the observation grid dimensions to
> 77,69 ?
> 
> The Documentation is not clear to me on how to do this. Can you point me
> to some clear directions on how to do this?
> 
> 
> 
> 
> --------------------------------------------------
> From: "John Halley Gotway" <johnhg at rap.ucar.edu>
> Sent: Wednesday, October 01, 2008 1:57 PM
> To: <walford02 at hotmail.com>
> Cc: <met_help at mailman.ucar.edu>
> Subject: Re: [Met_help] Mode tool
> 
>> Seagayle,
>>
>> We recommend using the copygb utility for regridding GRIB files.  We
>> haven't included any interpolation options within MET itself, but
>> instead,
>> we require that the input fcst/obs fields reside on the
>> same domain.
>>
>> The copygb utility is distributed as part of the WRF Post-Processor.  So
>> if you have WPP installed, you'll already have copygb.  If not, you can
>> also access it from the NWS Climate Prediction Center Page:
>> http://www.cpc.noaa.gov/products/wesley/copygb.html
>>
>> If you have any trouble getting copygb to do what you'd like it to do,
>> I'd
>> be happy to help.
>>
>> John
>>
>> walford02 at hotmail.com wrote:
>>> Hello,
>>>
>>> I get an error when I run the MODE tool that says:
>>>
>>> ERROR: main() -> forecast and observation grid dimensions do not match
>>> (77, 69) != (1121, 881)
>>>
>>> Is there a way to downscale my observation grid dimensions to match the
>>> model forecast?
>>>
>>> Segayle
>>>
>>>
>>> _______________________________________________
>>> Met_help mailing list
>>> Met_help at mailman.ucar.edu
>>> http://mailman.ucar.edu/mailman/listinfo/met_help
>>
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