[Met_help] [rt.rap.ucar.edu #77752] History for Satellite data comparison

[John Halley Gotway via RT]

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  Initial Request
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Hi, my name is Gilberto Maldonado

I am studying a PhD at UNAM in Mexico. I'm working with pullutants
dispersion and I'm trying to understand if MET can make comparisons with
satellite data, specifically with CO (carbon monoxide) data.

Time ago I used MET to compare WRF forecasts against measurements in situ.
But now I'm trying to compare some WRF forecasts against CO satellite data.
I have two formats of different data: '.txt' y '.nc'.

Thank you very much for any comment you have.

-- 
Gilberto Maldonado


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  Complete Ticket History
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Subject: Satellite data comparison
From: John Halley Gotway
Time: Tue Aug 30 15:23:25 2016

Gliberto,

I see that you've used MET in the past to verify WRF output against in
situ
observations.  And you're wondering if MET can read satellite data.  I
presume that you're still trying to evaluate model output of some
sort.  So
you'd like to compare a gridded NWP forecast to observed satellite
data.
Please let me know if that's not correct.

My answer is that anything is possible.  It's very likely that some
amount
of reformatting would be necessary before MET is able to read it.  If
you're able to put the satellite data into a gridded NetCDF file that
follows the CF-convention, then we'd be very close.

If you have sample forecast and analysis files, please post them to
our
anonymous FTP site following these instructions:
   http://www.dtcenter.org/met/users/support/met_help.php#ftp

Please also send a description of the type of comparisons you're
trying to
make.  Let me know when you put something up there, and I'll go grab
it and
take a look.

Thanks,
John Halley Gotway
met_help at ucar.edu

On Tue, Aug 30, 2016 at 2:08 PM, Gilberto Maldonado via RT <
met_help at ucar.edu> wrote:

>
> Tue Aug 30 14:08:44 2016: Request 77752 was acted upon.
> Transaction: Ticket created by gilm.pako at gmail.com
>        Queue: met_help
>      Subject: Satellite data comparison
>        Owner: Nobody
>   Requestors: gilm.pako at gmail.com
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=77752 >
>
>
> Hi, my name is Gilberto Maldonado
>
> I am studying a PhD at UNAM in Mexico. I'm working with pullutants
> dispersion and I'm trying to understand if MET can make comparisons
with
> satellite data, specifically with CO (carbon monoxide) data.
>
> Time ago I used MET to compare WRF forecasts against measurements in
situ.
> But now I'm trying to compare some WRF forecasts against CO
satellite data.
> I have two formats of different data: '.txt' y '.nc'.
>
> Thank you very much for any comment you have.
>
> --
> Gilberto Maldonado
>
>

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Subject: Satellite data comparison
From: Gilberto Maldonado
Time: Mon Sep 05 15:23:18 2016

Hi John,

I'm sorry for not answering before. I was out for a couple of days.

Yes, you are right I was wondering if MET can read satellite data and
I
want to compare a gridded NWP forecast to observed satellite data.

Now the step that follows is to grid the satellite data into a NetCDF
file.
I will work on that, and if you agree I will contact you when it's
done.
And when I have a sample forecast and analysis files I'll post them.

Thank you very much for your advices,

Gilberto Maldonado

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Subject: Satellite data comparison
From: John Halley Gotway
Time: Tue Sep 06 09:47:43 2016

Gilberto,

OK, sounds good.  I'd suggest writing a CF-compliant NetCDF file in
the
classic data model (i.e. NetCDF3).  One major enhancement for the next
version of MET (version 6.0) will be switching to reading/writing the
enhanced data model in NetCDF4.  But MET version 5.2 and all previous
versions only support 3.

Fortunately, the "nccopy" utility can be run to easily convert between
3
and 4.

Thanks,
John

On Mon, Sep 5, 2016 at 3:23 PM, Gilberto Maldonado via RT
<met_help at ucar.edu
> wrote:

>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=77752 >
>
> Hi John,
>
> I'm sorry for not answering before. I was out for a couple of days.
>
> Yes, you are right I was wondering if MET can read satellite data
and I
> want to compare a gridded NWP forecast to observed satellite data.
>
> Now the step that follows is to grid the satellite data into a
NetCDF file.
> I will work on that, and if you agree I will contact you when it's
done.
> And when I have a sample forecast and analysis files I'll post them.
>
> Thank you very much for your advices,
>
> Gilberto Maldonado
>
>

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