[GEMPAK #DMR-506008]: Adding New Entries to IMGTYP.TBL

Hi Andrew,

Tom forwarded your ticket for me to handle.  You're going to need to add an 
entry to $GEMTBL/sat/imgtyp.tbl for the AREA file you wish to view, complete 
with min and max image pixel values, satellite ID and image channel (defined as 
2**(n-1) where n is the channel number).

entries for imgtyp.tbl look like:

!                   |IMG     |      |      |SAT ID|IMGTYP| PIXEL| DEFAULT      |
!SAT ID             |TYP     |   MIN|   MAX|NUMBER|NUMBER| DEPTH| LUT FILE     |
!(20)               |(8)     |   (6)|   (6)|   (6)|   (6)|   (6)|      (14)    |
!                   |        |      |      |      |      |      |              |
!------------------------------------------------------------------------------
SOUNDER              CTP           0    255     71  2**26      1 ctp_upc.tbl
SOUNDER              PW            0    255     71  2**27      1 pw_upc.tbl


I'm assuming that you have this information available from the header of the 
AREA file.

Take a look at this table for more examples.  If you run into trouble, let me 
know if I can get a copy of one of the AREA files to work with, but like you 
said: you may need to remap these MODIS images if you have projection issues.

Best,

Michael James
Unidata






> Tom,
> 
> I've recently been struggling with the issue of viewing some new McIDAS
> AREA formatted files in GEMPAK using routines such as SFMAP and GPMAP.
> I passed along a question to the gembud distribution, and a separate email
> to my "GEMPAK mentor" from my days at the University of Nebraska, Clint
> Rowe.  I apologize for emailing you directly, but I haven't been able
> to get anywhere, and Clint suggested that you might be able to assist.
> 
> Here is a rundown of what I'm trying to do...
> 
> We have some McIDAS AREA files here at Marshall Space Flight Center
> that contain MODIS data, obtained from the University of Wisconsin and
> other providers, and some other files that we produce locally.  I would
> like to use these files for display within GEMPAK routines, but when I
> put their file names into GPMAP, such as "SATFIL=AREA0001", I receive
> an error that there is no entry for data type AREA0001 within the file
> "IMGTYP.TBL".  My understanding is that the IMGTYP.TBL file contains
> entries for "known" satellite types, along with the expected range of
> data and a reference to the corresponding color enhancement table.
> 
> What would I need to add to the IMGTYP.TBL file in order for it to
> recognize AREA files from sources that aren't already included?  I am
> speculating that there needs to be a matching number between an AREA
> file satellite identifier value and the column value in IMGTYP.TBL.
> Is this correct?
> 
> Are there any settings within the AREA file data or header information
> block that I must modify to match values in IMGTYP.TBL to achieve a
> successful lookup for other values, such as projection?
> 
> I also expect that I could run into some problems with the projection
> of the MODIS data within the AREA files but expect that I could fix that
> using McIDAS commands such as imgremap.k.
> 
> I will appreciate any guidance you might be able to provide.  I've asked
> so me of our "local GEMPAK experts" here at Marshall and no quick fixes
> have come to mind!
> 
> Thank you,
> Andrew Molthan
> 
> 


Ticket Details
===================
Ticket ID: DMR-506008
Department: Support GEMPAK
Priority: Normal
Status: Open