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20000705: Several GEMPAK questions

Christian,

You can create the grid for any area...and display a subset.

You typically create a grid file with gdcfil, and specify the
GRDAREA to be that which the analysis will occupy.

Then, when you create your surface and contour data plot,
you specify the GAREA (graphics area) to be the region that you want plotted.

When you create the grid file, MAXGRD specifies the maximum number of grids 
that 
you will allow in that file. This can be up to 10,000. You can use this grid
file over and over for your barnes analysis, and if you no longer need a grid 
in the
file, you can remove it with the  GDDELT program.

Let me know if you have further questions,

Steve Chiswell
Unidata User SUpport


>From: Christian Page <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200007051403.e65E3tT00608

>
>Hi again,
>
>  I am now ok with producing surface plots (stations plot with barnes
>PMSL analysis) with GEMPAK thanks to your help and the online manuals  :
>
>http://www.sca.uqam.ca/analyse/local/mtl.gif
>http://www.sca.uqam.ca/analyse/local/ne.gif
>http://www.sca.uqam.ca/analyse/local/eur.gif
>http://www.sca.uqam.ca/analyse/local/fr.gif
>
>But, I have other questions :
>
>1- For now, I am doing a Barnes analysis for each grid separatly, and I am doi
> ng
>a new grid each time I am doing these plots. Is it possible to produce a grid
>that I can use for subsequent plots, or is it not advisable?
>
>2- Is it possible to produce a Barnes analysis for the whole Eastern part of
>North America, then plot a subset of this big grid to produce a Montreal Area
>plot and a Northeast US plot? This would give a better barnes analysis.
>
>Thanks again...
>
>Christian Page      finger address@hidden => tel. + adresse
>address@hidden    http://www.sca.uqam.ca/
>
>Assistant de recherche / Research Assistant
>Universite du Quebec a Montreal / Universite McGill / McGill Radar
>
>