[gradsusr] Shaded plot only for values above a minmum

[Goodson,Ron [Edm]]

totally agree.  Maskout reflects the size of the grid (as you note) ..
while the contouring interpolates.  But, I'm old so the maskout method
is still in many of my scripts from long ago... all of which are for
quick looks of the data rather than public (or publication) output.
 
ron

________________________________

From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Stephen McMillan
Sent: March 3, 2014 10:37 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] Shaded plot only for values above a minmum


Hey Ron, 
>From my experience, unless you have a relatively high resolution grid,
your maskout method tends to produce a jagged edge.  I think the "fancy
dancy" method does a much better job, producing fairly smooth edges even
on the coarser grids.  I've attached a sample overlaying the four cloud
cover layers in the GFS model output, using the first method that
Jennifer mentioned ('set gxout shaded2').  I'm using version
2.0.1.oga.1.  Of course, whatever works for you...
Stephen Mc


On Mon, Mar 3, 2014 at 12:20 PM, Goodson,Ron [Edm]
<Ron.Goodson at ec.gc.ca> wrote:


	
	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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