[gradsusr] Combining two shaded variables.

Fri Aug 7 09:36:03 EDT 2015

Stuart,
Thanks for providing the script, that certainly helps.  With the first
image, I have no problem getting the tcdcclm overlaid with apcpsfc.
However, as it is, your code will generate only one such map since it
should exit after the first timestep (=3).  What is the value of "map"?
Stephen

On Fri, Aug 7, 2015 at 8:29 AM, Chorley Weather <
weatherstu at chorleyweather.com> wrote:

> On 07-08-2015 13:19, Stephen McMillan wrote:
> > Hi,
> > I don't quite follow what you're trying to do, since your last two
> > sample lines appear precisely the same.  Bottom line, for it to work:
> >
> > - Display first variable, save it
> > - Clear, then display second variable, then save it with previous
> > saved map as the background and a specified transparent color
> > -To add a third variable, clear, then display the third variable, then
> > save it with the second saved map as background and specified
> > transparent color
> > -And so on
> >
> > If above is not addressing your problem then, to properly diagnose it,
> > it would help for you to send the appropriate lines of your code that
> > you are using.  Also, which version of GrADS are you using?
> > Stephen Mc
> >
> > On Fri, Aug 7, 2015 at 5:33 AM, Chorley Weather
> > <weatherstu at chorleyweather.com> wrote:
> >
> >> On 05-08-2015 19:31, Stephen McMillan wrote:
> >>
> >> Jose, Stuart,
> >>
> >> Jeff's recommendation for 2.1+ and the alpha channel is probably
> >> the
> >> best way to go since you can control the transparency/opaqueness,
> >> but
> >> here's a sample script if you don't have or don't want to upgrade.
> >> Cloud clover with precip overlay sample attached, along with script
> >> that created it.
> >>
> >> Good luck!
> >> Stephen Mc
> >>
> >> On Wed, Aug 5, 2015 at 1:36 PM, Jeff Duda <jeffduda319 at gmail.com>
> >> wrote:
> >>
> >> Upgrade to version 2.1+ and use the alpha channel when creating
> >> colors.
> >>
> >> Jeff
> >>
> >> On Wed, Aug 5, 2015 at 12:15 PM, Chorley Weather
> >> <weatherstu at chorleyweather.com> wrote:
> >>
> >> On 05-08-2015 16:09, Stephen McMillan wrote:
> >> Stuart,
> >> 1. Display first variable then save to an image file
> >> 2. Clear screen, then display second variable
> >> 3. Save to another file using first file as background (-b
> >> option)
> >> and specify an appropriate transparent color (-t option)
> >>
> >> Resulting saved map should be without the rough, pixelated
> >> edges
> >>
> >> Stephen Mc
> >>
> >> On Wed, Aug 5, 2015 at 10:04 AM, Chorley Weather
> >> <weatherstu at chorleyweather.com> wrote:
> >>
> >> Hi guys,
> >>
> >> I have been trying to combine two shaded variables in one
> >  image,
> >
> >>> for
> >>> example precip & cloud cover. I have tried the maskout
> >  function but
> >
> >>> the
> >>> output looks to rough and pixelated. Can anybody suggest a
> >  better
> >
> >>> way to
> >>> get a smoother result.
> >>>
> >>> Many thanks in advance
> >>> Stuart.
> >>>
> >>> --
> >>> Chief Forecaster & Owner
> >>> _______________________________________________
> >>> gradsusr mailing list
> >>> gradsusr at gradsusr.org
> >>> http://gradsusr.org/mailman/listinfo/gradsusr [1] [1] [1]
> >>
> >> Links:
> >> ------
> >> [1] http://gradsusr.org/mailman/listinfo/gradsusr [1] [1]
> >>
> >> _______________________________________________
> >> gradsusr mailing list
> >> gradsusr at gradsusr.org
> >> http://gradsusr.org/mailman/listinfo/gradsusr [1] [1]
> >  Thanks Stephen, I will have a go at that cheers.
> >  --
> >  Chief Forecaster & Owner
> >  _______________________________________________
> >  gradsusr mailing list
> >  gradsusr at gradsusr.org
> >  http://gradsusr.org/mailman/listinfo/gradsusr [1] [1]
> >
> >  --
> >
> >  Jeff Duda
> >  Graduate research assistant
> >  University of Oklahoma School of Meteorology
> >  Center for Analysis and Prediction of Storms
> >
> >  _______________________________________________
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> >
> >  Links:
> >  ------
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> >
> >  _______________________________________________
> >  gradsusr mailing list
> >  gradsusr at gradsusr.org
> >  http://gradsusr.org/mailman/listinfo/gradsusr [1]
> >  Hi Stephen,
> >
> >  The sample script you sent has worked well with my own variables as
> > shown in the attached image. The problem I have is the output image
> > keeps replacing the previous image, ie. my printim is
> >
> >  'printim pcpn-cldcvr.png x1100 y675 -b gfs_ukcloudcover1'i'.png  -t
> > 0';#overlay/save 2nd variable on previous image, black as transparent.
> >
> >  How do i script it were i get    printim pcpn-cldcvr1.png x1100 y675
> >                                   printim pcpn-cldcvr2.png x1100 y675
> >                                   printim pcpn-cldcvr2.png x1100 y675
> >  And so on.
> >
> >  --
> >  Chief Forecaster & Owner
> > _______________________________________________
> >  gradsusr mailing list
> >  gradsusr at gradsusr.org
> >  http://gradsusr.org/mailman/listinfo/gradsusr [1]
> >
> >
> >
> > Links:
> > ------
> > [1] http://gradsusr.org/mailman/listinfo/gradsusr
> >
> > _______________________________________________
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> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> Hi Stephen,
> The last sample line was supposed to be 3.png (typo). I'm using
> opengrads and the code is thus:
>
>
>    i = 3
>    while ( i<maps )
>
> * Set up a few preliminary characteristics
> setmap(1)
> setSMcols(1)
> 'set t 'i
>
> *'define dew  = const((dewpt(tmp2m,rh2m)-273.16),0,-u)'
> 'set gxout shaded'
> 'set csmooth on'
> 'set clevs 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100'
> 'set ccols 0 63 62 61 60 59 58 57 56 55 54 53 52 51 50 47 46 45 44 43 42
> 41 17 39 38 37 36 35 34 33'
>
> 'd tcdcclm'
>
> 'cbar'
> 'printim gfs_ukcloudcover1'i'.png x1100 y675';#1st (backgrd) image
>
> 'c'
>
> setstucols(1)
> 'set t 'i
> 'set gxout shaded'
> 'set csmooth on'
> 'set clevs 0.2 0.5 1.5 2 3 4 5 6 7 8 9 10 13 16 19 22 25 30 35 40 45 50
> 60 70 80 90 100'
> 'set ccols 0 43 44 45 46 47 48 49 39 38 37 36 35 33 22 23 24 25 26 27 28
> 29 67 66 65 64 63 62 61'
>
> 'd apcpsfc'
>
> 'printim pcpn-cldcvr.png x1100 y675 -b gfs_ukcloudcover1'i'.png  -t
> 0';#overlay/save 2nd variable on previous image, black as transparent
>
>
> i = i+1
> endwhile
>
> Like I said the output image just re writes over the last, so I only
> ever have 1 image. I should be getting 80+ images. Thanks for your
> advice.
>
> regards,
> Stuart
> --
> Chief Forecaster & Owner
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>
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