[gradsusr] Combining two shaded variables.

Fri Aug 7 11:40:01 EDT 2015

Stuart,
Thanks for sending your script.

The reason the output keeps replacing the previous image is because the
output filename is static, i.e., it is replacing the previous one with each
loop.  Following is a suggested fix to the affected line, where i changed
pcpn-cldcvr.png to pcpn-cldcvr'i'.png:

'printim pcpn-cldcvr'i'.png x1100 y675 -b gfs_ukcloudcover1'i'.png  -t
0';#overlay/save 2nd variable on previous image, black as transparent

Note:  if you don't need to keep each background image, you could make its
name static since it would be replaced with each loop.

Let me know if you have an additional question.  Otherwise, good luck!
Stephen Mc

On Fri, Aug 7, 2015 at 9:58 AM, Chorley Weather <
weatherstu at chorleyweather.com> wrote:

> 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 mailing list
>>>>>> gradsusr at gradsusr.org
>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr [1] [1] [1] [1]
>>>>>>
>>>>>
>>>>> Links:
>>>>> ------
>>>>> [1] http://gradsusr.org/mailman/listinfo/gradsusr [1] [1] [1]
>>>>>
>>>>> _______________________________________________
>>>>> gradsusr mailing list
>>>>> gradsusr at gradsusr.org
>>>>> http://gradsusr.org/mailman/listinfo/gradsusr [1] [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] [1]
>>>>
>>>> --
>>>>
>>>> Jeff Duda
>>>> Graduate research assistant
>>>> University of Oklahoma School of Meteorology
>>>> Center for Analysis and Prediction of Storms
>>>>
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>>>> gradsusr mailing list
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>>>>
>>>> Links:
>>>> ------
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>>>>
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr [1] [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] [1]
>>>>
>>>>
>>>>
>>>> Links:
>>>> ------
>>>> [1] http://gradsusr.org/mailman/listinfo/gradsusr [1]
>>>>
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr [1]
>>>>
>>> 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
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr [1]
>>>
>>
>>
>>
>> Links:
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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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>
>
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