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20020305: GPFRONT with satellite image


Patrick,

It sounds like you don't have enough colors to display the satellite
image on your Xvfb screen :1.0. If you have other scripts running
and generating their displays on :1.0, especially if they are also displaying
satellite images, then the possibility exists to have more than one gf 
process trying to access the color map at the same time. 
Recall that without ntl running on the display, each process will have its own
colors, and you could be using 128 satellite colors and 33 graphic colors (161
colors total). 

You can try the following:

1) ensure that you don't have other scripts using the :1.0 display at the
   time you are running your script. If you are running a lot of scripts
   from cron, consider using a master script that queues up the
   products that you are producing (also works well to balance the load
   on your system).

2) try the gif driver instead of gf. This will avoid the use of the X server,
   and therefore the color conflicts. If this works, then it likely
   means that your X display colors are fewer than necessary.

3) Try launching a second virtual display and using that one.

4) look for any orphaned gf or xw processes using :1.0 that might
   have occured if your script exited before running gpend.

Steve Chiswell
Unidata User SUpport





> 
> Hi Clint,
> 
> Took your script and changed filenames and it worked fine. Funny thing
> is.....
> 
> I ran your script from the command line and it worked.  Got the same image
> you sent me.  I immediately ran the attached script from the command line
> and got the attached image.  In the attached script, I changed the device to
> what I would use in a script running through cron.  Also, added a couple
> variables for the image name, and set the display to work with the gf
> device.  So something's up with that.  I get satellite to plot fine in other
> scripts using gpmap, but can't get gpfront to plot satellite data with a
> script specifying the gf device.
> 
> Another thing, after I ran the attached script and got the attached image,
> if I run your script again, it no longer works, I get the attached (bad)
> image in my x-window.  If I then copy in a default color table, then run
> again, your script again works.  In my modified script, I do the same thing
> I did on the command line, copying in a "black" color table, but no dice.
> If you have any further ideas, I would love to hear.  Are you confused yet?
> I am.  Thanks for your help!
> 
> Patrick
> 
> 
> ----- Original Message -----
> From: "Clint Rowe" <address@hidden>
> To: <address@hidden>
> Cc: <address@hidden>
> Sent: Tuesday, March 05, 2002 3:54 PM
> Subject: Re: GPFRONT with Satellite
> 
> 
> > Patrick,
> >
> > There must be something strange in your script (e.g., a badly defined
> > variable).  Try running the extremely simple script I've attached -- all
> > you might need to do is change the filenames.  I get a nice IR image with
> > fronts overlaid.
> >
> > Clint
> >
> >
> > >Date: Tue, 05 Mar 2002 12:48:11 -0600
> > >From: "Patrick O'Reilly" <address@hidden>
> > >Subject: GPFRONT with Satellite
> > >To: address@hidden
> > >X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4522.1200
> > >X-Priority: 3
> > >X-MSMail-priority: Normal
> > >
> > >Hello,
> > >
> > >I am having lots of trouble getting a plot of fronts with IR satellite
> using
> > GPFRONT in a csh script.  I can get the plot when sitting at a terminal
> running
> > gempak interactively, but when I use a script, strange things happen.  I
> am not
> > running the script from cron, but executing it as user gempak from the
> command
> > line.  In my scripts, I have tried using just GPFRONT with a satellite
> image
> > specified. In this case I get an image of fronts, the IR satellite color
> bar
> > legend, but no satellite image.   I have also tried first plotting a
> satellite
> > image using GPMAP , then running GPFRONT to overlay the fronts.  In this
> case, I
> > get a satellite image, but no fronts drawn and an error: "[IM -1] Image
> file ...
> > does not exist."  Does anyone have a script running that produces this
> image (IR
> > and fronts)?  If so, I would love to see a copy.  I have about 20 scripts
> with
> > exactly the same "setup" running successfully, creating surface, model,
> > satellite, and radar images and overlays.  This one won't work, though.
> Any
> > input would be appreciated. Thanks.
> > >
> > >Patrick
> > >
> > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >Patrick O'Reilly                               Support Scientist
> > >The STORM Project            address@hidden
> > >208 Latham Hall                             ph: 319-273-3789
> > >University of Northern Iowa
> > >Cedar Falls, IA 50614
> > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >
> >
> >
> > ====================================================================
> > Clinton M. Rowe
> > Associate Professor
> > Meteorology/Climatology Program                  phone:(402)472-1946
> > Department of Geosciences                          fax:(402)472-4917
> > University of Nebraska-Lincoln                        address@hidden
> >
> >
>