How can I import new satellite enhancement tables into NAWIPS and GARP?

It is easy for you to import new image enhancement tables into GEMPAK,
NSAT, and GARP.  Here are the steps:

1) Obtain a new enhancement table.  You may decide to create your own 
enhancement tables or modify existing ones.  Simply use any of the
existing tables in $GEMTBL/ as examples.  Or, you may want to convert
an existing McIDAS/RAMSDIS enhancement table to GEMPAK format.  (Use
the software et2nawips.tar.Z available on the SAC FTP server). 

2) Put the new enhancment table in the $GEMTBL directory ($GEMTBL/luts/
in NAWIPS 5.4).  It should be named with a ".tbl" extension. 

3) To make the new table available in NSAT, add the name of the
enhancement table to the file $NAWIPS/tables/nsat/enhance.tbl.
Follow the format:

% more enhance.tbl
1 sabir
1 roygbv
1 nmcir
1 colormb
1 lingray
1 watvap
...

Preface each name with a "1" and leave the ".tbl" suffix off the name.

4) To make the new table available in GARP, add the name of
the enhancement table to the file $NAWIPS/garp/tables/sat_enhance.tbl.
Follow the format:

DEFAULT         1;2;3;4         26;2;7;25;20;18;22;24;6
gray            1;2;3;4         1;2;3;4
sabir           1;2;3;4         1;2;3;4
roygbv          1;2;3;4         1;2;3;4
nmcir           1;2;3;4         1;2;3;4
...

where the fields are TAB separated (tablename[TAB]1;2;3;4[TAB]1;2;3;4).
Note that the 2nd and 3rd fields are not currently used.
Again, leave the .tbl suffix off the name.

That's it.  You should now have access to your new enhancement table
in all GEMPAK programs, NSAT, and GARP.

How can I change the default satellite enhancement table?

The DEFAULT value used for a given satellite image type is defined in 
the file $GEMTBL/imgtype.tbl ($GEMTBL/sat/imgtyp.tbl in NAWIPS 5.4).  
Each entry in the file is for a different type of satellite image.
Fore each different type of satellite image, a default color enhancement 
is defined in the last column.  This is the enhancement that is used 
when you first load the image.  It has no affect on the selection of 
enhancement tables you see when you choose the Option->Enhancement or 
Option->Color Enhancement pull down menus.

To change the default enhancement table for a given type of image, you
must change the name listed in the last column of the $GEMTBL/imgtype.tbl 
file.  All GEMPAK programs, NSAT, and GARP all use this table, so
if you change the default, it will take affect across all NAWIPS & GARP
software.