[gradsusr] Omit Missing Values

[Jeff Duda]

Oh, I misread the value.  My mistake.  The mask should be uogrddsl+98
instead.  You can read the documentation on the maskout function (
http://www.iges.org/grads/gadoc/gradfuncmaskout.html) for a full
description of how the function works.

Jeff

On Wed, Jan 23, 2013 at 12:01 PM, Brian Walsh <brianw at provair.com> wrote:

>  Hi Jeff,
>
>
>
> It doesn’t appear that worked. Where does the 98-uogrddsl come from?
>
>
>
> Brian
>
>
>
> *From:* gradsusr-bounces at gradsusr.org [mailto:
> gradsusr-bounces at gradsusr.org] *On Behalf Of *Jeff Duda
> *Sent:* January-23-13 2:19 PM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] Omit Missing Values
>
>
>
> Brian,
> Use the maskout function.
> 'define ucurrent = maskout(uogrdds,98-uogrdds)'
> 'define vcurrent = maskout(vogrdds,98-vogrdds)'
> 'e = mag(ucurrent,vcurrent)'
> 'd e'
>
> I think that should work.  Let me know if it doesn't.
>
> Jeff Duda
>
> On Wed, Jan 23, 2013 at 11:32 AM, Brian Walsh <brianw at provair.com> wrote:
>
> Hello,
>
>
>
> I’m plotting ocean currents and the grib file contains values of -99 for
> grid points near land. So, when I try to plot the combined current
> speed/direction (u, v), it has values very high near and over land. I can
> use basemap to cover the land, but there are grid points near land and over
> water that are still showing (see attached sample image where red is the
> extreme/missing values).
>
>
>
> I think the const command is what I need, but I’m not sure how to set this
> up when I want to combine the u, v parameters. I tried:
>
>
>
>         'define ucurrent=const(uogrddsl, -99, -u)'
>
>         'define vcurrent=const(vogrddsl, -99, -u)'
>
>         'e=mag('ucurrent','vcurrent')'
>
>         'd e'
>
>
>
> But, no luck. Any ideas?
>
>
>
> Thanks
>
>
>
> Brian
>
>
>
>
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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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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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