##############################################################################
#                                                                            #
#                 ATOVS and AVHRR Preprocessing Package (AAPP)               #
#                        Version 6.9 Release Notes                           #
#                             28 April 2009                                  #
#                                                                            #
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1. Package contents
-------------------
The following files are contained in this update release 
(with file sizes in bytes):

  RELEASE_NOTE_AAPP_6_9.txt         3235 This release note
  AAPP_update_6_9.tgz              48209 Source code and data

This is an incremental update; users need to have installed version 6.1 and
updates 6.2, 6.3, 6.4, 6.5, 6.6, 6.7 and 6.8.


2. Purpose
----------
The main purposes of this update are as follows:

 (i)   Update to NOAA-19 values (which have previously been emailed to users)
 (ii)  NOAA-16 AMSU-B gross limits update
 (iii) New tool to retrieve AVHRR visible calibration from NOAA web site

  A detailed list of changed modules is given in section 6.


3. Installation
---------------
a. Copy the tgz file to your AAPP top directory (i.e. the directory containing
   AAPP, metop-tools and iasi-tools)

b. Unpack it using the command
   tar -xvmzf AAPP_update_6_9.tgz

   or if your system does not support the "-z" option in tar, use
   gunzip -c AAPP_update_6_9.tgz | tar -xmf -
   
c. Go to the AAPP_6 top directory and type
   make 


4. License
----------
To use this software, users need to have registered for AAPP v6 with the
NWP SAF (www.nwpsaf.org), and to have agreed to the terms of the license
agreement.


5. Version control information
------------------------------
The source package (AAPP_update_6_9.tgz) corresponds to Subversion Revision 151
in the AAPP repository held at the Met Office. 


6. Detailed list of changes since AAPP v6.8, rev 143 to 151.
-------------------------------------------
Key: M=Modified, A=Added, D=Deleted

Decommutation
=============
M      AAPP/src/decommutation/bin/convert_chrpt.F
M      AAPP/src/decommutation/libdecom/atovdc.F
M      AAPP/src/tools/libsatid/satid.txt
Update satid for NOAA-19.
Change satid for FY1D to avoid conflict with NOAA-19.
Bug fix in convert_chrpt.F (initialise "unpacked").
Comment out diagnostic in atovdc.F, causes problem on some systems.

Calibration
===========
M      AAPP/src/calibration/libamsuacl/amsua_clparams.dat
M      AAPP/src/calibration/libamsubcl/amsub_clparams.dat
M      AAPP/src/calibration/libmhscl/mhs_clparams.dat
Update NOAA-19 values (typo in MHS PRT coefs, antenna position for AMSU-A2).
Update NOAA-16 AMSU-B gross limits.

Tools
=====
A      AAPP/src/tools/bin/avh_get_vis_coefs.ksh
A      AAPP/src/tools/bin/avh_get_vis_coefs.F
M      AAPP/src/tools/bin/Makefile
New tool to retrieve AVHRR visible coefficients from NOAA web site and to
insert them into AVHRR 1b file.

M      metop-tools/src/libeps_avhrrl1b_6.5/convert_avh1b.F
Set minimum counts to 1 when using 10-bit output mode, since 0 is often used as
an error value.