[gradsusr] gradsusr Digest, Vol 8, Issue 28

Tue Oct 19 06:47:57 EDT 2010

 Hi,

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.

--------------------------------------------------
From: <gradsusr-request at gradsusr.org>
Sent: Tuesday, October 19, 2010 5:03 AM
To: <gradsusr at gradsusr.org>
Subject: gradsusr Digest, Vol 8, Issue 28

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> Today's Topics:
>
>   1. Bug related to 'set clab masked' ? (MY)
>   2. scale factor (cellyn lee)
>   3. Re: scale factor (krishnamohan)
>   4. Omega (Wendell Farias)
>   5. Dods Satellite imagery (Metris Limited Forecaster)
>   6. Re: Omega (Jeffrey Duda)
>   7. variable=environment (Andrew Revering)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 18 Oct 2010 09:40:08 +0800
> From: MY <funnytyphoon at gmail.com>
> Subject: [gradsusr] Bug related to 'set clab masked' ?
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <AANLkTimbtQP_LKpkUQQOiu-ttbLfwYxCw9VVcc4BkfDv at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Dear all,
>
> I encounter a problem: when the command 'set clab masked' is used, and
> one of the end of a line is located at the region where 'masked'
> labels are displayed, the line can't be displayed with "draw line"
> command.
>
> Is this a bug? I'm using the grads-2.0.a9.oga.1-win32_superpack.exe.
>
> Best wishes,
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
> YING, Ming
> Shanghai Typhoon Institute of China Meteorological Administration
> 166 Puxi Road, Xuhui District, Shanghai, 200030
> PR China
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 17 Oct 2010 19:33:14 -0700 (PDT)
> From: cellyn lee <cellyn_lee53 at yahoo.com>
> Subject: [gradsusr] scale factor
> To: gradsusr at gradsusr.org
> Message-ID: <52343.13274.qm at web55503.mail.re4.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
>
>
> Hi,
> ?
> Anybody know what is scale factor and offset in a netcdf file? and how to 
> determine when I want to write a netcdf file?
> Thanks.
>
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> ------------------------------
>
> Message: 3
> Date: Mon, 18 Oct 2010 09:55:44 +0530
> From: krishnamohan <krishmet at gmail.com>
> Subject: Re: [gradsusr] scale factor
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <AANLkTimX_R3GyWU59q=53GvW=qkXvATFo=Vv_ecRtkGP at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hai Cellyn,
>
> *scale_factor* - If present for a variable, the data are to be multiplied 
> by
> this factor after the data are read by the application that accesses the
> data
>
> *add_offset* - If present for a variable, this number is to be added to 
> the
> data after it is read by the application that accesses the data. If both
> scale_factor and add_offset attributes are present, the data are first
> scaled before the offset is added. The attributes scale_factor and
> add_offset can be used together to provide simple data compression to 
> store
> low-resolution floating-point data as small integers in a netCDF file.
>
> see http://ferret.wrc.noaa.gov/noaa_coop/coop_cdf_profile.html for more
> details
>
> -- 
> Krishnamohan.K.S
> Junior Research Fellow
> Department Of Atmospheric Sciences
> Cochin University of Science and Technology
> Cochin,India
>
>
>
> On Mon, Oct 18, 2010 at 8:03 AM, cellyn lee <cellyn_lee53 at yahoo.com> 
> wrote:
>
>>   Hi,
>>
>> Anybody know what is scale factor and offset in a netcdf file? and how to
>> determine when I want to write a netcdf file?
>> Thanks.
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
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> ------------------------------
>
> Message: 4
> Date: Mon, 18 Oct 2010 11:12:04 -0700 (PDT)
> From: Wendell Farias <wendellrgf at yahoo.com.br>
> Subject: [gradsusr] Omega
> To: GRADS <gradsusr at gradsusr.org>
> Message-ID: <38215.12929.qm at web50901.mail.re2.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear all,
>
> I'm using the ARWpost and It don't calculate the vertical velocity Omega. 
> How
> can I calculate the Omega on Grads?
>
> Thank you in advance,
> Wendell
>
>
>
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> ------------------------------
>
> Message: 5
> Date: Tue, 19 Oct 2010 07:26:41 +1300
> From: Metris Limited Forecaster <metris at clear.net.nz>
> Subject: [gradsusr] Dods Satellite imagery
> To: gradsusr at gradsusr.org
> Message-ID: <000601cb6ef2$02df7110$089e5330$@net.nz>
> Content-Type: text/plain; charset="us-ascii"
>
> Question I have  is there any DODS source or other of current satellite
> imagery ... and perhaps script snippets?
>
>
>
> Regards
>
>
>
> Howard Staines
>
>
>
> Forecaster Metris Limited
>
> websited -  <http://www.metris.co.nz> www.metris.co.nz  - phone 06 
> 8441042 -
> fax 06 8441046
>
>
>
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> ------------------------------
>
> Message: 6
> Date: Mon, 18 Oct 2010 13:30:21 -0500
> From: Jeffrey Duda <jdduda at iastate.edu>
> Subject: Re: [gradsusr] Omega
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <AANLkTiko6vFEs9ZBjFNhbY-OjBGQu+xnpz36yvguL6iO at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Wendell,
> I can think of two ways:
>
> 1) an approximation for omega is -rho*g*w, where rho is air density at
> whatever height, g = 9.8, and w is vertical velocity in z-wind vertical
> velocity
> 2) Omega can also be approximated by using the 'vint' function.  What you
> would do is vertically integrate divergence up to the level at which you
> want omega.  For example, if you want 700 mb omega, you'd do 'd vint(psfc,
> hdivg(u,v), 700)'.  Obviously make sure all of those expressions are in 
> the
> same units.
>
> Good luck.
>
> Jeff Duda
>
> On Mon, Oct 18, 2010 at 1:12 PM, Wendell Farias 
> <wendellrgf at yahoo.com.br>wrote:
>
>> Dear all,
>>
>> I'm using the ARWpost and It don't calculate the vertical velocity Omega.
>> How can I calculate the Omega on Grads?
>>
>> Thank you in advance,
>> Wendell
>>
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
> -- 
> Jeff Duda
> Iowa State University
> Meteorology Graduate Student
> 3134 Agronomy Hall
> www.meteor.iastate.edu/~jdduda
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> ------------------------------
>
> Message: 7
> Date: Tue, 19 Oct 2010 02:07:45 -0500
> From: "Andrew Revering" <andy at f5data.com>
> Subject: [gradsusr] variable=environment
> To: "'GrADS Users Forum'" <gradsusr at gradsusr.org>
> Message-ID: <274301cb6f5c$584bd430$08e37c90$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> This is probably a simple problem, but I can't figure it out.
>
>
>
> I'm using the OpenGrads superpack, and my variable gx returns 
> "environment"
> instead of a value. Any ideas?
>
>
>
> 'q xy2gr 'sitelon+1' 'sitelat-1
>
> maxx = subwrd(result,3)
>
> gx = subwrd(result,3)
>
> gy = subwrd(result,6)
>
>
>
> say 'Max value is 'gx
>
>
>
>
>
>
>
> says..   "Max  value is environment"
>
>
>
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> End of gradsusr Digest, Vol 8, Issue 28
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