Re: [python-users] My first approach: I'm looking for reference's documents & links about migrate from Gempak to Python MetPy // files and reading format

  • To: banco <banco@xxxxxxxxxxxxxx>
  • Subject: Re: [python-users] My first approach: I'm looking for reference's documents & links about migrate from Gempak to Python MetPy // files and reading format
  • From: Ryan May <rmay@xxxxxxxx>
  • Date: Wed, 16 Jun 2021 11:25:46 -0600
Greetings!

To accomplish something similar to GEMPAK's sfmap, what you're looking is
probably MetPy's simplified/declarative plotting interface. This example
creates a station model plot using it:


https://unidata.github.io/MetPy/latest/examples/plots/surface_declarative.html

As far as what data you can use with MetPy, any format that you can read
into numpy/pandas/xarray can be used with MetPy. We have been working on
solutions to use many of the formats traditionally used for meteorological
applications. For instance, the example above uses Pandas to read a CSV
file of observations. MetPy also has a METAR parser that can generate a
Pandas DataFrame, which could instead be used with that code:


https://unidata.github.io/MetPy/latest/tutorials/declarative_tutorial.html#plot-surface-obs

This METAR parser should work fine with data downloaded from
https://thredds-test.unidata.ucar.edu/thredds/catalog/noaaport/text/metar/catalog.html
(considering
that it was tested extensively using it).

Hope this helps!

Ryan

On Tue, Jun 8, 2021 at 8:43 AM banco <banco@xxxxxxxxxxxxxx> wrote:

> Good morning!!
>
> I am a Gempak user. And I would like to use Python MetPy
> environment too. At  the  beginning, if possible, the aim
> is to have both softwares working.
>
> I would appreciate if someone knows how, in Python environment,:
>
> 1) if a file is read (Synop data for instance) in Gempak's
> scripts, using sfmap, in this way:
>
>     sfmap << EOF
>            SFPARM   = skyc:.4;tmpc;wsym:.7;ALTM;;dwpc;brbk:.8::212
>            SFFILE   = /data/ldm/gempak/surface/20210607_sao.gem
>     .....
>
> How would the equivalent in a Python MetPy environment be?
>
> At this url, GEMPAK Comparison Guide,
> https://unidata.github.io/MetPy/latest/userguide/gempak.html
> this sfmap's GEMPAK Function (Python/MetPy Equilvalent) has its
> row empty.
>
> 2) On the other hand, in a context of acquiring files data from LDM,
> what kind of
> which file format should be used to read them in a Pyhon Metpy
> environment?
>
> ** The name and extension of the file is different? Does this mean
> one has to change LDM configuration?
>
> ** Is this different than reading from THREDDS Data Server? Isn't it?
>
> https://thredds-test.unidata.ucar.edu/thredds/catalog/noaaport/text/metar/catalog.html
>
> I have been looking for files or videos on YouTube on the
> subject but by the time being I cannot find these subjects.
>
> Is it somewhere on this website(about userguide)?
> https://unidata.github.io/MetPy/latest/userguide/index.html
>
> Any help is welcome: any link, website's page, Unidata's video, etc.
>
> Thank you very much in advance.
>
> Best regards
>
> Gustav Pittaluga
>
> Department of Atmospheric Sciences
> Buenos Aires University
> Argentina
>
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-- 
Ryan May, Ph.D.
Software Engineer
UCAR/Unidata
Boulder, CO
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