HISTORY.txt changes to PGE40/MOD_PR12M   
This file shows the following:
(a) What was changed in the PGE
(b) Why it was changed
(c) How the output product will be affected by the change
(d) The data of the change.


v2.1.3                                                      12/21/00
====================================================================
1. Files README.txt and MOD_PR12M.prod_rules updated for new runtime
   parameter SatelliteInstrument.

v2.1.2                                                      10/06/00
====================================================================
Source SCF: (v2.1.2 09/25/00)
1. Fixed the problem about extracting two period LST in do_lst.
2. Fixed the problem about extracting two period TEXT in do_text.
3. Fixed the valid range and fill value for BRDF in both monthly.c
   and MOD_PR12M.fs.
   In BRDF1 and BRDF2, Valid_range changed from -127 127 to -127 126, 
   and _FillValue from 128 to 127.


v2.1.0                                                       8/30/00
====================================================================
Source SCF: (v2.1.0 08/01/00)
1. Restructured MOD12M to provide both 16 day periods of NBAR,
   NBAR_QC, Texture, Texture_QC, BRDF, VI, VI_QC, Snow, Snow_QC, LST
   and LST_QC.  We dropped the land/water mask (since a form of it is
   embedded in NBAR_QC) and BRDFDB.
2. Fixed Metadata for LongName (to MCF) and ParameterName (to 
   just NBAR).   

Additional changes by SSTG:
1. MOD12M.mcf
   Changes requested by scientist( when compared with the baselined mcf file)
   - Mandatory
       Parameter                                 From                To  
       SizeMBECSDataGranule                      FALSE               TRUE
       ProductionDateTime                        FALSE               TRUE
       AutomaticQualityFlag                      TRUE                FALSE 
       AutomaticQualityFlagExplanation           TRUE                FALSE 
       QAPercentMissingData                      TRUE                FALSE
       QAPercentOutofBoundsData                  TRUE                FALSE
       QAPercentInterpolatedData                 TRUE                FALSE
   - Data_Location
       Parameter                                 From                To 
       MeasuredParameterContainer                NONE                MCF
       GPolygonContainer                         NONE                MCF
       OperationalQualityFlag                    PGE                 DAAC
       OperationalQualityFlagExplanation         PGE                 DAAC
       LongName                                  PGE                 MCF
   - CLASS = "M" moved from the group to each object for the groups of 
     "QAFlags", "QAStatus", and "Information Content".
   - Value of "VersionID" changed from "1" to "2"
   - Value of "LongName" changed to "MODIS/Terra Land Cover Data Base 32-Day L3 
     Global 1km ISIN Grid" added 


v2.0.7                                                          7/19/00
========================================================================

1. Changed from local to GMT time in LocalGranuleID of "monthly.c" file.

v2.0.6                                                   6/05/00
====================================================================
 
1. Fixed the bad local granule ID in some MOD12M tiles.
2. The QApercentXXXqualitys of MODLAND QA metadata are currently
   calculated from two periods of Nbar. 
3. The messed bit pattern has been cleared up in all the parameters. 
4. If only good quality data are accepted, there are nearly no data in
   most of tiles of MOD12M except fill values. Hence currently the MOD12M
   accepts all the processed data, but the quality can be found in QC
   files.
5. The Nbar_QC in MOD12M was from Num_QC_Words 1. Since the Nbar in the
   MOD12M is determined by  Num_QC_Words 2 (Band1 quality), the Nbar_QC in
   MOD12M  has been changed to select Num_QC_Words 2 .

v2.0.5                                                    3/03/00
====================================================================
Source SCF: (v2.0.4 2/17/00, v2.0.5 2/23/00)
1. Updated HISTORY.txt, README, PACKINGLIST and MOD_PR12M.PROD_RULES 
   files.
2. Added a subsetted product (MOD_SS.MOD12M).

V2.0.3                                                    9/21/1999
=======================================================================
1. STM simplify the PRODUCTION RULE. At least one MOD43B4 required
   (Product from MOD_PR43B).
2. Integrated with ECS validated mcf files.  (7/23/99)
3. Began the integration process with generation-3 perl script etc

V2.0.2                                                    3/09/1999
=======================================================================
Staring CM HISTORY.txt  

Some changes of LC monthly code by STM.
Two mdoules, monthly.c and monthly.h, were modified and
send for repatching.

The description for modification:

1. Texture.

The highest texture value with acceptable QC is selected at moment.
Acceptable QC will be defined by STM. 
Currently, "00" is used as acceptable flag
produced at ideal quality, since no other flags (bit
2-7) be used to explain "01" for non ideal quality.
If at-launch MODAGTEX provided "01" in their product. STM can change
acceptable flag to "00" and "01". But it is believed there should be some
good data during 32 days.

2. Nbar

The program will compare two nbar_QC and select the one with the best
quality. The first two bits and the second two bits are used.
The smaller QC has the better quality. The rest part of selecting QC
is easy for computer to do.

3. BRDF

Changes are simliar as Nbar. The best quality data is selected from 
two candidates. If they has the same quality, select the second one.

4. LST

The program will select the two maximum lst values which have acceptable 
lst_QC. 

5. Fixed one bug

The bit order of QA is checked. It is ascend from left to right. But in the 
function "get_bit_pattern" bit information was got in decend order from 
left to right. So bits positions need to be changed in the reverse 
order before it was applied.