[gradsusr] Omit Missing Values

[Brian Walsh]

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<mailto: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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