[gradsusr] Alpha channel

Tue Oct 19 15:57:40 EDT 2010

 Sorry, I repeat the question with the correct subject:

I am new and for this reason I d'ont know if you have talked about it, but
any way, Does anybody knows how can we print an alpha chanal image file from
GrADS?
Thanks.

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> Today's Topics:
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>   1. Re: Problem with ipcc data (Roger Rodrigues Torres)
>   2. CDIFF Versus HDIVG? (LeeJoice, Robert N)
>
>
> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 19 Oct 2010 17:03:22 -0200
> From: Roger Rodrigues Torres <roger.torres at cptec.inpe.br>
> Subject: Re: [gradsusr] Problem with ipcc data
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <AANLkTikEyW_mDXm3+43qQ6VwDq=uacU3DnAOuyke-5tz at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Ismaila,
>
> I'm working with this dataset and I faced the same problem with you.
> I found 2 manners to cope with it:
> 1) It is possible to open with an old version of Grads (grads-1.9b4) or
> 2) to trasform these data to Grb by CDO.
> But, as mentioned by our colleague Jennifer Adams
>
> "Do not use 'sdfopen' with version 1.9 to look at files with a 365-day
> calendar -- the time axis info will likely be incorrect. You must use 
> 'open'
> or 'xdfopen' and provide the full TDEF information. This has been 
> discussed
> at length in the forum, see for example: "
>
>
>
> http://gradsusr.org/pipermail/gradsusr/2009-January/008103.html
>
> http://gradsusr.org/pipermail/gradsusr/2009-April/008489.html
>
> http://gradsusr.org/pipermail/gradsusr/2009-December/010064.html
>
>
> Cheers,
> Roger
>
> 2010/10/19 Ismaila Diallo <ismailadiallo64 at yahoo.fr>
>
>> Dear Grads user
>> i have ipcc data who are in netcdf format and i can't open them whith
>> sdfopen.
>> Can anyone help me or give me some idea who will help me to resolve this
>> problem
>> thanks and best whishes
>>
>>
>>
>>
>>
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>
>
>
> -- 
> Roger Rodrigues Torres
> Ph.D. Student
> National Institute for Space Research (INPE)
> Center for Weather Forecast and Climate Studies (CPTEC)
> Phone: 55 12 3186-9541
> Personal Webpage: http://rtorres.webnode.com.br
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> Message: 2
> Date: Tue, 19 Oct 2010 14:27:26 -0500
> From: "LeeJoice, Robert N" <rnleejoi at nps.edu>
> Subject: [gradsusr] CDIFF Versus HDIVG?
> To: <gradsusr at gradsusr.org>
> Message-ID: <C8E35B51.2807%rnleejoi at nps.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I was wondering if there is a difference in the differencing scheme 
> between
> CDIFF and HDIVG.  I ask because I did a modified example from the
> documentation, i.e., divergence vice vorticity.  The documentation states
> that CDIFF uses centered differencing.  HDIVG says the same.  The images
> suggest something else unless I?m missing something.
>
> CDIFF file
> if(var='DIV')
>          'run bluewhitered.gs -2.0 .5 10'
>          'define dv = cdiff(vgrdprs,x)'
>          'define dx = cdiff(lon,x)*3.1416/180'
>          'define du = cdiff(ugrdprs*cos(lat*3.1416/180),y)'
>          'define dy = cdiff(lat,y)*3.1416/180'
>          'display (du/dx+dv/dy)*1e5/(6.37e6*cos(lat*3.1416/180))'
>          'run cbarn.gs 0.8 1 10.4 4.7'
> endif
>
> HDIVG file
> if(var='DIV')
>        'run bluewhitered.gs -2.0 .5 10'
>        'd 1e5*hdivg(ugrdprs,vgrdprs)'
>        'run cbarn.gs 0.8 1 10.4 4.7'
> Endif
>
> Here are the images in order...
>
> Thank you for any comments,
>
> Robert LeeJoice
> PhD Candidate, Naval Postgraduate School
>
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