[gradsusr] Combining two shaded variables.

Fri Aug 7 09:58:04 EDT 2015

On 07-08-2015 14:36, Stephen McMillan wrote:
> 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
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>>>>> gradsusr at gradsusr.org
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>>>> 
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>>> Thanks Stephen, I will have a go at that cheers.
>>> --
>>> Chief Forecaster & Owner
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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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>>> 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
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>>> 
>>> 
>>> 
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>> 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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Hi Stephen,

I have attached the full script so you can have a look through. Once 
again thank you very much.

Stuart
-- 
Chief Forecaster & Owner
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