[gradsusr] Omit Missing Values

[Brian Walsh]

Thanks Jeff. That worked!

Brian

From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Jeff Duda
Sent: January-23-13 2:41 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Omit Missing Values

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<mailto: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> [mailto: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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--
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms

This email and any attached files are intended solely for the use of the individual(s) and copied addressee(s) and may contain privileged and/or confidential information. Any distribution, use or copying by any means of this information is strictly prohibited. If you are not the intended recipient(s), please notify the sender by telephone or return the email and delete the material from your system(s).
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