20041027: huge gempak files

Dorothy,

Your grid size is only 96673 points. The defaults I provide for GEMPAK allow
400,000 plotted points (and 750,000 total points). Since you have GEMPAK 5.7.2
that is the version to use over an older 5.6 version.

The panel issue with the clear between drawing the box and plotting the data
is a known problem with gdcntr:
http://my.unidata.ucar.edu/content/support/help/MailArchives/gempak/msg03598.html

The solution is to use gdplot2 instead since it does not have the problem when
using the PANEL option to draw boxes around the plot area. Gdplot2 has
all the functionality of gdcntr, plus that of gdwind, gdmap, and gdstream,
so its the most general way to go.

Deleting grids can't reduce the size of a file since the space is already 
allocated.
To make smaller files, you could create a new one with gdcfil and copy over
the desired grids with gdmod, but this isn't necessary to accomplish your goal
of getting the box around the plot without having clear being called.

Steve Chiswell
Unidata User Support



>Hi Dororthy,
>
>I am forwarding your email to our developers who handle support-related
>questions.
>
>Cheers,
>Jen
>
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~
>Jennifer Oxelson                                     Unidata
>303-497-8123                                         Web Developer/Administrat
> or
>address@hidden                                     http://my.unidata.ucar.ed
> u
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~
>
>
>
>
>On Wed, 27 Oct 2004, Dorothy Durnford wrote:
>
>> Hi,
>>
>>      I'm trying to plot NARR (North America regional reanalysis)
>> fields.  They come in grid files containing space for 9000 grids.  I
>> usually work with gempak 5.6, but it crashes with these huge files.  I
>> can use gempak 5.7.2 with these files, but I'm having a problem with
>> gdcntr.  When I plot a page with multiple panels, the first panel's
>> outline box appears, the page clears, then the first panel's plot
>> appears, followed by the other panels' plots plus boxes.  Is this a bug
>> in v. 5.7.2?  So, I tried deleting grids from the huge file, to make it
>> a manageable size for v. 5.6 to handle.  Deleting grids didn't reduce
>> the size of the file.  I then used gdcfil to create my own grid file, to
>> which I could copy grids.  I copied the navigation info that gdinfo
>> provides re the huge file.  It follows:
>>
>>  GRID NAVIGATION:
>>      PROJECTION:          LCC
>>      ANGLES:                50.0  -107.0    50.0
>>      GRID SIZE:          349 277
>>      LL CORNER:               1.00   -145.50
>>      UR CORNER:              46.35     -2.57
>>
>>  GRID ANALYSIS BLOCK:
>>      ANALYSIS TYPE:        BARNES
>>      DELTAN:               4.000
>>      DELTAX:           -9999.000
>>      DELTAY:           -9999.000
>>      GRID AREA:             0.00 -180.00   86.00  180.00
>>      EXTEND AREA:           0.00 -180.00   86.00  180.00
>>      DATA AREA:             0.00 -180.00   86.00  180.00
>>
>> I used these values in gdcfil, with anlyss=4/0;0;0;0.  Gdinfo tells me
>> that the new grid's navigation info is identical to that of the huge
>> file.  But, when I try to copy a grid to the new file, gdmod tells me
>> that there are differences in the navigations of the two files.  Why is
>> this?  How can I get these grids into a smaller file?
>>
>> Thanks, Dorothy
>>
>>
>>
>
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