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RE: 20051219: contouring upper air data

Frank,

I thank you have it.
In the snmap plot you have first, set clear=yes.
In the second gdcntr invocation, set clear=no.

If your device is an XW, you are set. If you are writing
output to a file, such as PS, GF, PNG etc., remember to
add a "gpend" statement at the end of the script.

Also, you may have to use unique EOF names if your csh environment 
doesn't allow the same name to be used more than once. Eg, EOF_SNMAP
and EOF_GDCNTR.

Steve Chiswell
Unidata User Support


On Wed, 2005-12-21 at 07:04, Frank J. Marsik wrote:
> Sorry...one more question.  I was able to follow your instructions
> and successful produce contoured height fields for the upper air
> data.  What structure in my script do I need to follow to be able
> to overlay the contours onto a map with the plotted data?
> 
> After running the objective analysis, in a c-shell...do I simply put: 
> 
> snmap << EOF
> 
> ...parameter stuff...
> 
> run
> 
> exit
> 
> EOF
> 
> gdcntr << EOF
> 
> ...parameter stuff...
> 
> run
> 
> exit
> 
> EOF
> 
> 
> Thanks.
> 
> peace,
> frank
> 
> 
> -----Original Message-----
> From: Steve Chiswell [mailto:address@hidden] 
> Sent: Monday, December 19, 2005 4:05 PM
> To: address@hidden
> Cc: GEMPAK support
> Subject: 20051219: contouring upper air data
> 
> Frank,
> 
> No, I didn't create an analog to sfcntr for upperair.
> 
> The most comprehensive way to contour either upperair or surface data is to
> run the Barnes objective analysis on the file to create a grid, and then use
> the GD programs.
> The sfcntr is a shortcut which makes some limiting assumptions on map
> projection and mean station spacing based on the data to contour the data
> without writing the grid out to a grid file.
> 
> The way to contour the upper air data would be to create a grid file with
> gdcfil (or oagrid), run oabsnd, and then contour the grid.
> 
> I created sfcntr because with 20 minute data bins, you would have to run
> oabsfc up to 72 times per day, or wait a while until each hour's data has
> trickled in- but with the station density, you can get OK looking plots even
> if all the data hadn't arrived yet. For the most part, the upperair data
> oabsnd would only need to be run every 12 hours- but contouring on the fly
> before the data is complete is really unsatisfying.
> 
> 
> Steve Chiswell
> Unidata User Support
> 
> 
> On Mon, 2005-12-19 at 12:10, Frank J. Marsik wrote:
> > Steve:
> > 
> > Sorry about the direct email, but I figured that this is probably too 
> > simple a question for the Unidata user groups...
> > 
> > Is there an "upper air equivalent" to the sfcntr program in gempak?
> > I would like to contour geopotential height on the constant pressure 
> > maps.  I cannot seem to find such a program.
> > 
> > Thanks in advance.
> > 
> > peace,
> > frank
> > 
> > ======================================================================
> > ======
> > 
> > Frank J. Marsik
> > Associate Research Scientist        "We must remember that intelligence
> > Dept. of Atmospheric, Oceanic        is not enough.  Intelligence  -
> >  and Space Sciences                  plus character - that is the goal
> > 2455 Hayward, Room 2109              of true education."     
> > Ann Arbor, MI  48109-2143 
> > Phone: 734-763-5369                         - Martin Luther King, Jr.
> > Fax:   734-763-0437
> > URL: http://www.engin.umich.edu/~marsik/
> > 
> > ======================================================================
> > ======
> >