[gradsusr] Is there an easy way in GrADS to sample / aggregate a large data set instead of plotting it at full resolution?

[Bill Reilly]

You can also use the skip() function:

http://cola.gmu.edu/grads/gadoc/gradfuncskip.html

Bill

--

Bill Reilly

(+34) 686-110-748

bill at passageweather.com
www.passageweather.com

bill at brwebworks.com
www.brwebworks.com

On 12/15/2020 17:50, Jeff Duda wrote:
> You can write a control file and adjust the nx and ny values in the 
> XDEF and YDEF lines so that GrADS attempts to plot your fields on a 
> coarser grid. You could also try either using opengrads' re() function 
> or getting a coarser dummy field and using lterp() to interpolate your 
> raw grid to a coarser grid before plotting.
>
> Hopefully I understood your question properly. Good luck.
>
> Jeff Duda
>
> On Tue, Dec 15, 2020 at 7:36 AM Robert Kuligowski 
> <bob.kuligowski at noaa.gov <mailto:bob.kuligowski at noaa.gov>> wrote:
>
>     All,
>
>          I have some netCDF files with 6501 lines and 18,000 columns that
>     I'm plotting in GrADS, and creating the .png  output files is
>     taking a
>     long time.  I clearly don't need that much detail in the actual
>     image,
>     so is there a simple way to sample or aggregate the data in GrADS
>     before
>     plotting in order to make it render more quickly?  I looked
>     through the
>     documentation but wasn't able to find the droids I'm looking for. 
>     Thanks!
>
>     Cheers,
>
>     -- 
>     Bob Kuligowski, Ph.D.
>     Meteorologist
>     NOAA/NESDIS/Center for Satellite Applications and Research (STAR)
>
>     Mailing Address:
>     National Oceanic and Atmospheric Administration
>     NESDIS STAR/SMCD
>     Bob Kuligowski
>     NCWCP E/RA2
>     5830 University Research Court
>     2nd Floor, Office #2828
>     College Park, MD 20740-3818
>
>     Phone:  (301) 683-3593
>     Fax  :  (301) 683-3616
>
>     http://www.star.nesdis.noaa.gov/star/Kuligowski_B.php
>     <http://www.star.nesdis.noaa.gov/star/Kuligowski_B.php>
>     http://www.star.nesdis.noaa.gov/smcd/emb/ff/index.php
>     <http://www.star.nesdis.noaa.gov/smcd/emb/ff/index.php>
>
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>
> -- 
> Jeff Duda, Research Scientist
> University of Colorado Boulder
> Cooperative Institute for Research in Environmental Sciences
> NOAA/OAR/ESRL/Global Systems Laboratory
> Boulder, CO
>
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