20040120: GEMPAK and area files.

Mark,

The 2 byte entries for GOES 12 may or may not be in your imgtyp.tbl
file depending on what version of GEMPAK you have. 

The entries would look similar to:
GOES12               VIS           0  30240     78      1      2 GRAY
GOES12               IR2           0    255     78      2      2 GRAY
GOES12               IR3           0    255     78      4      2 watvap.tbl
GOES12               IR4           0    255     78      8      2 GRAY
GOES12               IR5           0    255     78     16      2 GRAY
GOES12               IR6           0    255     78     32      2 GRAY
GOES12               IR4           0    255     78    128      2 GRAY

Also, depending on whether or not your files have the expected
calibration information, you may get an all black image
(which I have created a fix for in the display drivers).
If you get that, we'll have to update your distribution.
The 2 numbers that specify the data range are dependent on 
how the values are found in your files. For example, the
range of 0 to 30240 for visible is based upon the
raw values in the data files- but yours may be different.

Steve CHiswell





>From: Mark Tucker <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200401201533.i0KFXFp2019276

>
>We've retrieved some area files from SSEC and are trying to use them with
>GPMAP.  When executed, gpmap gives the following error:
>
>No image type entry for file goes12_1_2003_162_0045.area
>
>satfil is set to the correct filename from the data we've retrieved.  The
>output from the strings command on the area file shows the following
>header info:
>
>RT GVAR
>GVARRAW
>
>GVARK003
>MOREGVAR
>MOREGVAR
>MOREGVAR
>MOREGVAR
>
>
>The download from ssec had the option of obtaining the files with 1 byte
>per pixel or 2 bytes per pixel.  The data we have has 2bytes per pixel.
>
>I received a response from someone on the gembud mailing list that
>directed me to the $GEMPAK/tables/sat/imgtyp.tbl.  I've looked the file
>over but cannot determine what I should put in as the "SAT ID", "SAT ID
>NUBMER" or "IMGTYPE NUMBER" fields.  I'm not sure if this is the fix I'm
>looking for but it seems to make sense.  I could not find any references
>to this problem in the support archives.
>
>All of our regular area files we ingest with the LDM work perfectly with
>the gempak applications.
>
>
>Mark Tucker
>Meteorology Dept. Systems Administrator
>Lyndon State College
>http://apollo.lsc.vsc.edu
>address@hidden
>(802)-626-6328
>
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