[gradsusr] Shaded plot only for values above a minmum

[Goodson,Ron [Edm]]

If not using the new fancy-dancy transparent colour stuff ...
 
I just use maskout for this .. eg .. plotting precip that as a coloured
shaded field I was plotting over another shaded field such as outgoing
longwave radiation (stand-in for clouds) using only grayshades.
 
In your case
 
mymask = var -9
d maskout(var,mymask)
 
ron
 

________________________________

From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Thomas Robinson
Sent: February 28, 2014 7:56 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Shaded plot only for values above a minmum


Thank you Jeff.  I actually have a plot of terrain, and I would like to
plot 'var' on top of that with the terrain in the background.  So I
really want to make a shaded plot overlaid on a shaded plot.  Just using
a background value won't work for that.  It there any way to just
eliminate the lower values? 


On Fri, Feb 28, 2014 at 1:13 PM, Jeff Duda <jeffduda319 at gmail.com>
wrote:


	use the ccols command to manually set the color levels.  If you
have N contour values, you need N+1 colors, the first one in the list is
the color corresponding to values below the lowest contour.  Set that to
0 (background), so that it will appear not to color values below your
minimum contour value.  See the controlling colors
<http://www.iges.org/grads/gadoc/colorcontrol.html>  section of the
documentation index for more information. 

	Jeff Duda


	On Fri, Feb 28, 2014 at 4:58 PM, Thomas Robinson
<ter at hawaii.edu> wrote:
	

		Aloha Grads Users,  

		I am trying to make a shaded plot where values only show
up if they are greater than 9.  So I do:

		set clevs 9 10 11 12 13 14 15
		d val
		cbarn

		That works great, but it fills in purple (default) for
everything below 9 which is most of the plot.  Is there a way to turn
off coloring in the areas below 9?  

		Thanks, 
		Tom
		

		-- 
		
		Tom Robinson
		President - Graduate Student Organization 
		Chair - Student Athletic Fee Committee 
		Graduate Student - Department of Meteorology
		
		

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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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-- 

Tom Robinson
President - Graduate Student Organization 
Chair - Student Athletic Fee Committee 
Graduate Student - Department of Meteorology


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