[gradsusr] help

[Eric Altshuler]

One obvious way to define the "border" of the Andes is to use surface topography. It's very easy to mask fields using topography data.

'umask=maskout(u,1000-hgtsfc)'
'vmask=maskout(v,1000-hgtsfc)'

The above commands will create masked wind components wherever surface elevation is above 1000 meters (you can choose your own threshold value).

----- Original Message -----
From: "Yaqiang Wang" <yaqiang.wang at gmail.com>
To: "GrADS Users Forum" <gradsusr at gradsusr.org>
Sent: Monday, May 28, 2012 8:27:22 PM
Subject: Re: [gradsusr] help

You need to get the latitue/longitude values of the border points of
Andes first, and then to make a mask grid data from it.

On Mon, May 28, 2012 at 8:05 PM, Claudia Wanzeler
<claudia.wanzeler at gmail.com> wrote:
> Hello Everybody,
>
>
>  I need to plot a wind field on a map, but would like to mask the Andes.
>  Someone on the list already made a mask over the Andes and that could help me?
>
>
>  Regards,
>
>   Cláudia
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr



-- 
*************************************************
Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China

yaqiang.wang at gmail.com

http://www.meteothinker.com
**************************************************

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