[Met_help] [rt.rap.ucar.edu #60781] History for MODE question
John Halley Gotway via RT
met_help at ucar.edu
Fri May 24 10:26:56 MDT 2013
----------------------------------------------------------------
Initial Request
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Hello,
My name is Michael Hollan. I am a graduate student in Atmospheric Science at Texas Tech University. I am attempting to use MODE for my thesis work. Specifically, I will be looking at simulated radar reflectivity in the WRF model compared to radar observations. In order for MODE to work, I was wondering if both my model field and observation field need to be in the same format. For example, will MODE work if my model is in netCDF format but my observations are in grib2 format?
I appreciate your time and look forward to your response. I may have further questions based on the answer to the question stated above.
Thanks,
Michael Hollan
Graduate Student - Atmospheric Sciences
Teaching Assistant
Texas Tech University
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Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #60781] MODE question
From: John Halley Gotway
Time: Mon Mar 25 19:01:15 2013
Michael,
That's not a problem. One can be GRIB2 and the other NetCDF.
However,
there are a few things to consider:
- The two fields must be on exactly the same grid. Otherwise, MODE
will
error out with and error message to that effect.
- The settings in the "fcst" and "obs" field will differ when you're
selecting which 2D data fields will be used from each file. Just look
at
the example test scripts and let me know if you get stuck.
- Hopefully, your model output is not a WRF output file directly. MET
doesn't read WRF output directly - instead, it must first be
proprocessed
using either the pinterp utility for WRF-ARW or the Unified
PostProcessor
(UPP).
Lastly, we just became aware of a bug in the areas that are being
written
out by the MODE tool. The areas artificially inflated because we're
essentially adding 1 extra row and column to the output. We're
working on
a fix for this and it'll be included in the METv4.1 release, which
should
be coming in the next couple of weeks.
Just let us know if you have more questions.
Thanks,
John Halley Gotway
met_help at ucar.edu
>
> Mon Mar 25 14:28:53 2013: Request 60781 was acted upon.
> Transaction: Ticket created by michael.hollan at ttu.edu
> Queue: met_help
> Subject: MODE question
> Owner: Nobody
> Requestors: michael.hollan at ttu.edu
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=60781 >
>
>
> Hello,
>
>
>
> My name is Michael Hollan. I am a graduate student in Atmospheric
Science
> at Texas Tech University. I am attempting to use MODE for my thesis
work.
> Specifically, I will be looking at simulated radar reflectivity in
the WRF
> model compared to radar observations. In order for MODE to work, I
was
> wondering if both my model field and observation field need to be in
the
> same format. For example, will MODE work if my model is in netCDF
format
> but my observations are in grib2 format?
>
>
>
> I appreciate your time and look forward to your response. I may have
> further questions based on the answer to the question stated above.
>
>
>
>
>
> Thanks,
>
>
>
> Michael Hollan
> Graduate Student - Atmospheric Sciences
> Teaching Assistant
> Texas Tech University
>
------------------------------------------------
Subject: RE: [rt.rap.ucar.edu #60781] MODE question
From: Hollan, Michael
Time: Wed Mar 27 19:42:59 2013
John,
Thanks for your help! I can just use copygb to get both fields on the
exact same grid, correct?
Thanks again,
Michael
________________________________________
From: John Halley Gotway via RT [met_help at ucar.edu]
Sent: Monday, March 25, 2013 8:01 PM
To: Hollan, Michael
Subject: Re: [rt.rap.ucar.edu #60781] MODE question
Michael,
That's not a problem. One can be GRIB2 and the other NetCDF.
However,
there are a few things to consider:
- The two fields must be on exactly the same grid. Otherwise, MODE
will
error out with and error message to that effect.
- The settings in the "fcst" and "obs" field will differ when you're
selecting which 2D data fields will be used from each file. Just look
at
the example test scripts and let me know if you get stuck.
- Hopefully, your model output is not a WRF output file directly. MET
doesn't read WRF output directly - instead, it must first be
proprocessed
using either the pinterp utility for WRF-ARW or the Unified
PostProcessor
(UPP).
Lastly, we just became aware of a bug in the areas that are being
written
out by the MODE tool. The areas artificially inflated because we're
essentially adding 1 extra row and column to the output. We're
working on
a fix for this and it'll be included in the METv4.1 release, which
should
be coming in the next couple of weeks.
Just let us know if you have more questions.
Thanks,
John Halley Gotway
met_help at ucar.edu
>
> Mon Mar 25 14:28:53 2013: Request 60781 was acted upon.
> Transaction: Ticket created by michael.hollan at ttu.edu
> Queue: met_help
> Subject: MODE question
> Owner: Nobody
> Requestors: michael.hollan at ttu.edu
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=60781 >
>
>
> Hello,
>
>
>
> My name is Michael Hollan. I am a graduate student in Atmospheric
Science
> at Texas Tech University. I am attempting to use MODE for my thesis
work.
> Specifically, I will be looking at simulated radar reflectivity in
the WRF
> model compared to radar observations. In order for MODE to work, I
was
> wondering if both my model field and observation field need to be in
the
> same format. For example, will MODE work if my model is in netCDF
format
> but my observations are in grib2 format?
>
>
>
> I appreciate your time and look forward to your response. I may have
> further questions based on the answer to the question stated above.
>
>
>
>
>
> Thanks,
>
>
>
> Michael Hollan
> Graduate Student - Atmospheric Sciences
> Teaching Assistant
> Texas Tech University
>
------------------------------------------------
Subject: RE: [rt.rap.ucar.edu #60781] MODE question
From: John Halley Gotway
Time: Wed Mar 27 22:21:34 2013
Michael,
Yes, that's right. Copygb can be used to regrid GRIB files. However,
it
only works on GRIB1 data at this point - not GRIB2. The wgrib2
utility
actually provides some limited support for regridding GRIB2 files - so
that's an option.
But probably the easiest is to use the cnvgrib utility to convert from
GRIB2 to GRIB1, and then use copygb. Examples of running copygb for
different projection types can be found in the online MET tutorial:
http://www.dtcenter.org/met/users/support/online_tutorial/METv4.0/copygb/index.php
Hope that helps.
Hopefully at some point we'll provide a regridding tool within MET
itself
to make this all easier.
John
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=60781 >
>
> John,
>
> Thanks for your help! I can just use copygb to get both fields on
the
> exact same grid, correct?
>
> Thanks again,
> Michael
>
> ________________________________________
> From: John Halley Gotway via RT [met_help at ucar.edu]
> Sent: Monday, March 25, 2013 8:01 PM
> To: Hollan, Michael
> Subject: Re: [rt.rap.ucar.edu #60781] MODE question
>
> Michael,
>
> That's not a problem. One can be GRIB2 and the other NetCDF.
However,
> there are a few things to consider:
>
> - The two fields must be on exactly the same grid. Otherwise, MODE
will
> error out with and error message to that effect.
>
> - The settings in the "fcst" and "obs" field will differ when you're
> selecting which 2D data fields will be used from each file. Just
look at
> the example test scripts and let me know if you get stuck.
>
> - Hopefully, your model output is not a WRF output file directly.
MET
> doesn't read WRF output directly - instead, it must first be
proprocessed
> using either the pinterp utility for WRF-ARW or the Unified
PostProcessor
> (UPP).
>
> Lastly, we just became aware of a bug in the areas that are being
written
> out by the MODE tool. The areas artificially inflated because we're
> essentially adding 1 extra row and column to the output. We're
working on
> a fix for this and it'll be included in the METv4.1 release, which
should
> be coming in the next couple of weeks.
>
> Just let us know if you have more questions.
>
> Thanks,
> John Halley Gotway
> met_help at ucar.edu
>
>>
>> Mon Mar 25 14:28:53 2013: Request 60781 was acted upon.
>> Transaction: Ticket created by michael.hollan at ttu.edu
>> Queue: met_help
>> Subject: MODE question
>> Owner: Nobody
>> Requestors: michael.hollan at ttu.edu
>> Status: new
>> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=60781 >
>>
>>
>> Hello,
>>
>>
>>
>> My name is Michael Hollan. I am a graduate student in Atmospheric
>> Science
>> at Texas Tech University. I am attempting to use MODE for my thesis
>> work.
>> Specifically, I will be looking at simulated radar reflectivity in
the
>> WRF
>> model compared to radar observations. In order for MODE to work, I
was
>> wondering if both my model field and observation field need to be
in the
>> same format. For example, will MODE work if my model is in netCDF
format
>> but my observations are in grib2 format?
>>
>>
>>
>> I appreciate your time and look forward to your response. I may
have
>> further questions based on the answer to the question stated above.
>>
>>
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Michael Hollan
>> Graduate Student - Atmospheric Sciences
>> Teaching Assistant
>> Texas Tech University
>>
>
------------------------------------------------
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