[gradsusr] Drawing something (line, point,...) over the map

Thu Aug 9 13:58:19 EDT 2012

Dear Jennifer,

I did it but it didn't work. Maybe I didn't do that correctly. Could you please explain more. As an example here is my work : I would like to show points (8.3 120.6) and (9 119.3) and also the line between them over my maps.

Latitude
longitude

8.3
120.6

9
119.3

Regards,

Tahereh

> From: gradsusr-request at gradsusr.org
> Subject: gradsusr Digest, Vol 30, Issue 19
> To: gradsusr at gradsusr.org
> Date: Thu, 9 Aug 2012 12:00:01 -0400
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> Today's Topics:
> 
> 1. Drawing something (line, point,...) over the map (T. haghroosta)
> 2. Re: How to calculate the pressure gradient? (Djordje Romanic)
> 3. Re: Drawing something (line, point,...) over the map
> (Jennifer Adams)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 9 Aug 2012 06:29:08 +0000
> From: "T. haghroosta" <haghroosta at hotmail.com>
> Subject: [gradsusr] Drawing something (line, point,...) over the map
> To: <gradsusr at gradsusr.org>
> Message-ID: <SNT104-W2403A6A7F39D90ECA64A85DDCC0 at phx.gbl>
> Content-Type: text/plain; charset="windows-1256"
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> 
> Dear All,
> 
> I have to repeat my question, Is it possible to draw a path with specific coordinates? For example I would like to show the position or the track (moving path) of a typhoon on a map. Is it possible to put some points (with specific coordinates) or lines on a map seperate from contours?
> 
> Regards,
> 
> Tahereh 
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> ------------------------------
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> Message: 2
> Date: Thu, 9 Aug 2012 08:50:25 +0200
> From: Djordje Romanic <djordje8 at gmail.com>
> Subject: Re: [gradsusr] How to calculate the pressure gradient?
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <CACWmqDci6TS4nRbjv=RRU3bvvGPW=Q-zRTmGoNTETK+=k3MsYw at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Thanks,
> 
> Since I only need the pressure gradient, and not the pressure gradient
> force, I should exclude 1/rho. Just one clarification. When I use cdiff
> function for pressure (e.g. in LON direction), should I divide it with dx
> or 2*dx. I believe that 2*dx would be correct.
> 
> Regards,
> Djordje
> 
> 
> On Wed, Aug 8, 2012 at 7:08 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> 
> > The pressure gradient is simply 1/rho * del(p), where del(p) is the
> > gradient operator, which can be displayed in Grads using the mathematical
> > decomposition of the gradient operator (i.e., derivatives in the x- and
> > y-directions). Use cdiff for those derivatives. Note, you'll have to
> > define your x- and y- grid spacing values as well. See the examples on the cdiff
> > help page <http://www.iges.org/grads/gadoc/gradfunccdiff.html> for how to
> > do that.
> >
> > Jeff Duda
> >
> > On Wed, Aug 8, 2012 at 5:48 AM, Djordje Romanic <djordje8 at gmail.com>wrote:
> >
> >> Dear Users,
> >>
> >> I have to calculate the pressure gradient in a given area (Southeast
> >> Europe) and I have a pressure date at 2.5 x 2.5 degrees (reanalysis data).
> >> Does anyone know how to calculate it in GrADS and how to show the results
> >> in the vector form?
> >>
> >> Thanks in advance.
> >>
> >> Regards,
> >> Djordje Romanic
> >> M.Sc. in Meteorology
> >> Cell: +38164 254 3539
> >> www.linkedin.com (Djordje Romanic profile)
> >>
> >>
> >> _______________________________________________
> >> gradsusr mailing list
> >> gradsusr at gradsusr.org
> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >>
> >>
> >
> >
> > --
> > Jeff Duda
> > Graduate research assistant
> > University of Oklahoma School of Meteorology
> > Center for Analysis and Prediction of Storms
> >
> >
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> ------------------------------
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> Message: 3
> Date: Thu, 9 Aug 2012 06:56:13 -0400
> From: Jennifer Adams <jma at cola.iges.org>
> Subject: Re: [gradsusr] Drawing something (line, point,...) over the
> map
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID: <50D53664-74F9-4A5D-9998-DE85D9E72D7A at cola.iges.org>
> Content-Type: text/plain; charset="us-ascii"
> 
> Yes. Use 'qw2xy' to convert world coordinates to x,y coordinates on the page. Then use 'draw line' to connect the points. 
> --Jennifer
> 
> 
> On Aug 9, 2012, at 2:29 AM, T. haghroosta wrote:
> 
> > Dear All,
> > 
> > I have to repeat my question, Is it possible to draw a path with specific coordinates? For example I would like to show the position or the track (moving path) of a typhoon on a map. Is it possible to put some points (with specific coordinates) or lines on a map seperate from contours?
> > 
> > Regards,
> > 
> > Tahereh
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> 
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
> 
> 
> 
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