[ncl-talk] mean value of all displayed grid points / pixel in a map

[Dennis Shea]

The question is vague

"I want to calculate the mean value of all displayed grid points in a map.

This means:
- i have gridded data for the entire world (gcm-results)
- i plot a map (stereographic projection) for Europe

NCL draws a rectangle map based on the given resource parameters. I am
looking for a function which counts all displayed values (pixel?) and
calculates an average value."

NCL handles "gridded data for the entire world (gcm-results)" all the time.

[1]  dim_avg_n_Wrap will calculate the means at each grid point over all
times.
[2] wgt_areaave_Wrap calculates an area average
[3] NCL can display much more than a "rectangular map"
[4] wks = gsn_open_wks("png" ,"frank")
     will send graphics to a png file

What do you mean by:

"Is there a chance that i can get the matrix-values which are send to the
(png-)workstation?"

=======
https://www.ncl.ucar.edu/Document/Functions/Contributed/dim_avg_n_Wrap.shtml
https://www.ncl.ucar.edu/Applications/climo.shtml
https://www.ncl.ucar.edu/Document/Functions/Contributed/wgt_areaave_Wrap.shtml
https://www.ncl.ucar.edu/Applications/maponly.shtml

https://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_contour_map.shtml

Good luck


On Mon, Sep 1, 2014 at 2:31 AM, Kreienkamp Frank <Frank.Kreienkamp at dwd.de>
wrote:

> Hello ,
>
> since having no one answering the original question.
>
> Is there a chance that i can get the matrix-values which are send to the
> (png-)workstation?
>
> Thanks in advance
> Frank Kreienkamp
>
> -----Ursprüngliche Nachricht-----
> Von: ncl-talk-bounces at ucar.edu [mailto:ncl-talk-bounces at ucar.edu] Im
> Auftrag von Frank Kreienkamp
> Gesendet: Mittwoch, 27. August 2014 06:37
> An: ncl-talk
> Betreff: [ncl-talk] mean value of all displayed grid points / pixel in a
> map
>
> Hello,
>
> i have searched the function list but i have not found a solution for the
> following problem.
>
> I want to calculate the mean value of all displayed grid points in a map.
>
> This means:
> - i have gridded data for the entire world (gcm-results)
> - i plot a map (stereographic projection) for Europe
>
> NCL draws a rectangle map based on the given resource parameters. I am
> looking for a function which counts all displayed values (pixel?) and
> calculates an average value.
>
> Thanks in advance
> Frank
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