>From: Unidata User Support <address@hidden>
>Organization: Unidata Program Center
>Keywords: 200009112348.e8BNm5b26728 Unidata-Wisconsin image MCIDAS LWTOA3
>pnga2area
Tony,
I am writing since I fear that you may have missed seeing the three
previous notifications (at the end of June and July, and beginning of
September) of the removal of delta-encoded satellite imagery from the
Unidata-Wisconsin (LDM feed type MCIDAS) datastream.
We have been broadcasting PNG compressed versions of the "regular" UW
stream images since the end of July. This dual broadcast will cease at
18 Z this Friday, September 15.
*************************************************************************
***** *****
***** If you have not upgraded your ldm-mcidas decoders to the *****
***** latest release, Version 7.6.4, you will stop decoding images *****
***** at THIS FRIDAY! *****
***** *****
*************************************************************************
1) Rationale for moving to PNG compression of imagery:
Delta-encoding is the compressed format that the images have been in
since the beginning of the Unidata-Wisconsin datastream. Switching
to the much more efficient PNG compression will allow us to increase
the number of images in the Unidata-Wisconsin while mitigating the
impact that the increased data volume will have on your network.
2) What to do to continue using Unidata-Wisconsin imagery:
You must transition to use of the ldm-mcidas 7.6.4 decoder 'pnga2area'
in order to continue decoding imagery.
Binary distributions of ldm-mcidas are available from operating
system-specific directories of anonymous FTP on ftp.unidata.ucar.edu:
Directory Operating system(s)
-----------------------------+----------------------------
pub/binary/osf1_4.0-alpha DEC OSF/1 4.0
pub/binary/hpux_11.00-hp9000 HP HP-UX 11.0
pub/binary/aix_4.3-rs6000 IBM AIX 4.3
pub/binary/linux_2.0-i586 RedHat 5.2 Linux
pub/binary/linux_2.2-i686 RedHat 6.[12] Linux
pub/binary/irix_6.5-mips SGI Irix 6.5
pub/binary/irix64_6.5-mips SGI Irix64 6.5
pub/binary/sunos_5.6-sparc Sun Solaris SPARC Versions 2.6
pub/binary/sunos_5.7-sparc Sun Solaris SPARC Versions 2.7
pub/binary/sunos_5.8-sparc Sun Solaris SPARC Versions 2.8
pub/binary/sunos_5.7-i86pc Sun Solaris i86pc Versions 2.7
pub/binary/sunos_5.8-i86pc Sun Solaris i86pc Versions 2.8
A source distribution is also available in the pub/ldm-mcidas of
anonymous FTP on ftp.unidata.ucar.edu. We are available to help you
build the decoders from source if your system is not compatible with
one of those listed above.
In all cases (source and binary), the distribution compressed tar file,
ldm-mcidas.tar.Z, should be FTPed in binary mode!
3) What else has to be done to transition to the new decoder:
Decoding the PNG compressed products will require that you install
and configure pqact.conf for the new ldm-mcidas decoder, pnga2area.
The ldm-mcidas distribution contains a file, ldm-mcidas-pqact.conf, of
example LDM pattern-actions for the PNG compressed imagery. This file
also presents a short description of the product header format that
will eventually be used for all Unidata-Wisconsin imagery products.
Users should review the contents of ldm-mcidas-pqact.conf; extract and
adapt the actions to suit their environment (e.g., GEMPAK and/or
McIDAS); incorporate them into the pqact.conf file on their IDD ingest
machine; and send a HUP signal to pqact after verifying the entry with
'ldmadmin pqactcheck'.
4) What information is available about the new decoder, and how do
I setup my LDM's pqact.conf file to run it:
Information on the PNG-compressed image decoder can be found in the
ldm-mcidas man pages under the ldm-mcidas Home Page:
http://www.unidata.ucar.edu/packages/mcidas/mcidd/ldm-mcidas.html
Unidata User Support is available to help you in your transition. If
you have any questions/difficulties/comments, PLEASE let us know ASAP.
Tom Yoksas
>From address@hidden Tue Sep 12 08:12:36 2000
>Subject: MSCD situation
Hi Tom,
No, I haven't missed the messages. It's just the usual situation of me
trying to take these actions on my own, and not really knowing or
understanding what I'm doing. I did upgrade the ldm last week and, with
the exception of a few minor problems, I managed to get it done.
A bigger issue is that we have had a rash of hardware problems on our
workstations, beginning with two dead cpus and three dead video cards over
the summer. They have been replaced, but all workstations are very
unstable and I have my hands full rebooting machines all day long. Our
systems people have reason to believe my server was hacked into, since
there are entries in files and entire files that have been systematically
altered or removed. They've spect alot of time over the past month trying
to figure out what happened.
I'll try to sit down and go through your instructions, but I may not get to
it before Fri or the weekend. Sure hope you don't have to check up on all
the sites, but I do appreciate your looking after us.
Thanks,
Tony
****************************************************************************
Anthony A. Rockwood Metropolitan State College of Denver
Meteorology Program Dept.of Earth and Atmospheric Sciences
303.556.8399 P.O. Box 173362, Campus Box 22
address@hidden Denver, CO 80217-3362
fax: 303.556.4436 www.mscd.edu/~eas
****************************************************************************
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