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20000706: 20000705: Several GEMPAK questions

Christian,

You can reproject the grid area/subarea to any projection, so the GAREA 
and PROJ you use in gdcntr does not have to be the same as that of the
gridfile (ie, you can grid your N. American surface observations using a 
CED or STR projection, and plot your surfacemap and contours using LCC etc.

Cloud symbols are defined by SFPARM for CSYL, CSYM, and CSYH for
low, middle and high clouds respectively when plotting with SFMAP.

Steve Chiswell.


>From: Christian Page <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200007061915.e66JFYT24178

>
>Hi again,
>
>  Thanks a lot for your input. I am now successful in creating a north america
>grid to plot several regions, but how do I specify which grid to use in a grid
>file? Is it done automatically?
>
>  Also, is there a way to plot cloud type symbols with sfmap or another gempak
>program?
>
>Regards,
>
>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
>
>On Wed, 5 Jul 2000, Unidata Support wrote:
>
>> 
>> 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 gri
> d 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 gr
> id
>> >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 o
> f
>> >North America, then plot a subset of this big grid to produce a Montreal Ar
> ea
>> >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
>> >
>> >
>> 
>> ****************************************************************************
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>> 
>