[gradsusr] Setting missing values (or any value) to undefined

[Matt Bunkers - WFO UNR]

The maskout(WC,WC+119.9) option didn't work.  I've tried playing with
different numbers but still get weird gradients.

Can I include more than one value for the UNDEF variable in the ctl file?
The documentation doesn't suggest so.

Thanks,

-- Matt


On Fri, Oct 30, 2015 at 10:14 AM, Goodson,Ron [Edm] <Ron.Goodson at ec.gc.ca>
wrote:

> If this is the only data being analyzed .. then wouldn’t just setting
> UNDEF in the ctl file be even easier (though I’ll admit the maskout is way
> more flexible and necessary if you have a bunch of different variables that
> each use different missing values).
>
>
>
> *From:* gradsusr-bounces at gradsusr.org [mailto:
> gradsusr-bounces at gradsusr.org] *On Behalf Of *Jeff Duda
> *Sent:* October 30, 2015 9:46 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] Setting missing values (or any value) to
> undefined
>
>
>
> maskout(WC,WC+119.9)
>
>
>
> On Fri, Oct 30, 2015 at 10:06 AM, Matt Bunkers - WFO UNR <
> matthew.bunkers at noaa.gov> wrote:
>
> Hi,
>
>
>
> I have hourly wind chill (WC) grids for which I want to find the minimum
> WC.  The problem I have is that some of the areas of the grids are missing
> (set to -120).  When I compute the minimum WC and then display the result
> (as either image or contour) I get huge gradients between the real data and
> the missing data.  What I would like to do is set my missing data to
> undefined (so they don't plot).  I've tried that with the const function
> but that doesn't appear to work.  Is there another function that would
> allow me to set a given value (-120 in this case) of my grid to undefined?
> If it is set to undefined then when I plot the grid I shouldn't see those
> horrendous gradients.
>
>
> 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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