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#                                                                            #
#                               IASI OPS-LRS                                 #
#         Release Notes for version OPS_V6-0+p1-AAPP-sl-20110901             #
#                             07 November 2011                               #
#                                                                            #
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1. Package contents
-------------------
The following files are included in this release (with file sizes in bytes):

  RELEASE_NOTE_OPS-LRS_V6-0+p1.txt          4313 This release note
  NWPSAF-MF-UD-006_OPS_manual.pdf         482215 Updated user manual
  OPS_V6-0+p1-AAPP-sl-20110901.tgz      20122591 IASI OPS-LRS package
  convert_config_files.ksh                  3399 Updated AAPP script (see below)

To install and run the OPS-LRS package, users need to have first installed
AAPP v6.12 (or higher).

Most users will also require the FFTW and XERCES libraries that have been
issued previously with OPS-LRS, though alternatives may be suitable on some
systems. See User Manual for details.


2. Purpose
----------
OPS-LRS processes MetOp IASI data from Level 0 to Level 1c. This version
incorporates the latest OPS updates from CNES.

The Level 0 data are normally obtained by direct-readout AHRPT.

Previous releases of OPS-LRS have required the NWP SAF to make a relatively 
large number of modifications to the original code from CNES, in order to allow
the software to be run on Linux platforms. For this release, OPS-V6-0, many of
these changes have been applied in the CNES code, and the release is therefore
a step towards commonality between OPS-LRS and the OPS used in the EUMETSAT
core ground segment. The main difference that affects users is that the IASI
configuration files no longer need to be converted to local machine endianness;
all configuration files should be Big Endian as delivered by EUMETSAT.

There is no change in the IASI radiances between OPS-V6-0 and the previous
release.


3. Installation
---------------
a. Copy the tgz file to the directory where you want to install OPS-LRS.

b. Unpack it using the command
   tar -xvmzf OPS_V6-0+p1-AAPP-sl-20110901.tgz

   or if your system does not support the "-z" option in tar, use
   gunzip -c OPS_V6-0+p1-AAPP-sl-20110901.tgz | tar -xmf -
   
c. Configure and build OPS-LRS following the instructions in the OPS-LRS User
   Manual.

d. If you do not already have them, download the configuration files from the
   AAPP ftp site.

If you are using AAPP v6.x, the updated version of convert_config_files.ksh
should be copied to AAPP_6/iasi-tools/src/bin, followed by "make bin". Also,
if you use AAPP_RUN_METOP, you should either comment out the call to
"convert_config_files" or replace it with "convert_config_files -b" (-b =
Big Endian). AAPP version 7 will incorporate these changes.


4. License
----------
To use this software, users need have registered for AAPP version 6 or version 7
with the NWP SAF (www.nwpsaf.org), and to have agreed to the terms and
conditions for use of AAPP and OPS-LRS.


5. Delivery mechanism
---------------------
OPS-LRS is delivered by FTP. A test case is normally available on the
AAPP FTP site; if you have difficulty obtaining it please contact the NWP SAF
Helpdesk.


6. System requirements
----------------------
Supported platforms include: AIX, Solaris and Linux PC. HPUX and IRIX are not
supported.

The host machine must be able to run multithreaded applications, using pthreads
(POSIX threads).

To build OPS-LRS requires a Fortran 90 or FORTRAN 77 compiler, a C compiler and
a C++ compiler.

To run OPS-LRS requires about 1 Gbyte of disk space and 2 Gbyte of memory.

Standard Unix utilities (including make, ar, tar, perl5, lex, yacc) are used.


7. Documentation
----------------
The OPS-LRS User Manual has been updated to version 1.4 for use with this
release.


8. AAPP Web site
----------------
For further information on AAPP and OPS-LRS, please visit the NWP SAF web site
at http://www.nwpsaf.org

For bug reports, suggestions for improvement, etc., please use the NWP SAF 
feedback form, linked from the above web site.