[gradsusr] Plotting zero for undefined values (as an image)

Jeff Duda jeffduda319 at gmail.com
Wed May 20 12:54:44 EDT 2015

Use const(precip,0.0,-u) to set missing data to a value of 0.0.

The const and maskout functions are very useful when thresholding or
working with undefined data points.

Jeff Duda

On Wed, May 20, 2015 at 11:37 AM, Matt Bunkers - WFO UNR <
matthew.bunkers at noaa.gov> wrote:

> Hi,
> I am adding observed precipitation from 3 consecutive days and on occasion
> there will be undefined areas in small portions of my grid files.  Instead
> of having nothing (or blank spaces) plotted when I sum the three files, I
> would like to change the undefined values to zero (basically assuming no
> precip) and then add the files.  I used the "set undef 0.0" command but I
> still don't get the data to plot (i.e., I have blank/missing areas).  Is
> there a way I can get the undef to be 0.0 so they will not plot as blank
> spaces and instead sum with the regular defined values?
> Thanks,
> -- Matt
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Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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