[gradsusr] How to save netcdf data without the outlines of the continents?

[Carlos Batista]

Olá Arlindo (...)

Arlindo, meu problema é o seguinte (...)

Estou tentando fazer umas análises de wavelets no Matlab usando dados
netcdf de TSM. O problema é que o Matlab entende todas as informações como
matrizes, inclusive os valores de undef e os que representam os contornos
dos continentes.
Esses valores de contornos dos continentes, por distoarem muito e por
interferir nos calculos de wavelets, não podem estar na minha série de
dados. Então, pensei se eu conseguisse tirar os dados referentes aos
contornos dos continentes no GrADS e depois exportar apenas os dados das
TSM poderia funcionar a matemática das wavelets

Ontem eu consegui nomear todos esses valores de contornos com NaN com uma
manobra dentro do próprio Matlab. Porém, mesmo esses NaN ainda estão
atrapalhando no momento de fazer os calculos das wavelets (...) Fiz um
teste pegando pontos de latitudes e longitudes com apenas os dados de TSM e
o Matlab fez bem os calculos das wavelets.

Penso que entrando apenas com os dados de TSM o matlab possa fazer as
minhas wavelets!

****************************************************
For Andrew

I'm trying to do some analysis of wavelets in Matlab using netcdf SST data.
The problem is that Matlab understands all information as matrix, including
the values ​​ undef and the representing the contours of the continents.
These values ​​of contours of continents for changer and interfere in my
calculations of wavelets...  Like this these can not be in my dataset.

So I thought if I could get the data to the contours of the continents in
GrADS and then export only data from TSM could work the mathematics of
wavelets

Yesterday I managed to name all these contours with NaN values ​​with a
maneuver within Matlab itself. But even these are still messing NaN when
you do the calculations of wavelets (...) I did a test taking points of
latitude and longitude with only the SST data and Matlab did well the
calculations of wavelets.

I think just coming with SST matlab can make my wavelets!

Thanks!!!

Carlos




2014-07-12 2:09 GMT-03:00 Andrew Friedman <andfried at berkeley.edu>:

> I’ve also found that ‘sdfwrite’ is useful for exporting to Matlab, since
> Matlab can open netcdf files.
>
> On Jul 11, 2014, at 8:14 PM, Arlindo da Silva <dasilva at alum.mit.edu>
> wrote:
>
> > On Fri, Jul 11, 2014 at 1:11 PM, Carlos Batista <krlosbatist at gmail.com>
> wrote:
> >
> > Dear Users
> >
> > I need to save the data  SST file without contours of continents.
> >
> > I need to open this data in Matlab. The Matlab understands the contours
> as values ​​and I don't know 'say' for the Matlab that data of contours is
> not for "him" to read.
> >
> > Does anyone know?
> >
> >
> > I really do not understand what you are trying to do. Which?
> >
> > 1) You are trying to import in matlab an image that you created in
> grads, or
> >
> > 2)  You would like to open a binary SST file (that grads can read) in
> matlab for further analysis,
> >
> >    Here is a very simple example of how to export ASCII data and import
> it into Matlab,
> >
> >
> http://cookbooks.opengrads.org/index.php?title=Recipe-002:_Saving_GrADS_variable_data_to_a_text_file
> >
> >    Here is a more sophisticated way of sharing data between grads and
> matlab using Java:
> >
> >
> http://opengrads.org/wiki/index.php?title=JyGrADS:_Java_and_Matlab_interface_to_GrADS_through_Jython
> >
> >    I never really released jygrads, but a working release can be found
> here:
> >
> >          http://opengrads.org/devel/jygrads/
> >
> >    I hope this helps.
> >
> >         Arlindo
> >
> > --
> > Arlindo da Silva
> > dasilva at alum.mit.edu
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> > gradsusr at gradsusr.org
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>
>
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