[gradsusr] Shaded plot only for values above a minmum

[Stephen McMillan]

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
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
> --
> Tom Robinson
> President - Graduate Student Organization
> Chair - Student Athletic Fee Committee
> Graduate Student - Department of Meteorology
>
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>

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