README -- Contents of /pub/geos-chem/data/GEOS_1x1/MODIS_LAI_200911/
03 Mar 2010
Bob Yantosca and Claire Carouge
geos-chem-support@g.harvard.edu


Data Download:
===============================================================================

The files in this directory may be accessed by FTP download:

   ftp ftp.as.harvard.edu
   cd pub/geos-chem/data/GEOS_1x1/MODIS_LAI_200911/YYYY/MM

where YYYY/MM are the year/month of the data you wish to download.

You may also use "wget" download:

   wget -r -nH "ftp://ftp.as.harvard.edu/pub/geos-chem/data/GEOS_1x1/MODIS_LAI_200911/"


Directories and Files:
===============================================================================

1985/
2000/ 
2001/  
2002/  
2003/  
2004/  
2005/  
2006/  
2007/  
2008/

In each subdirectory listed above there are the following files:

MODIS.LAIv.V5.geos.1x1.YYYY      -- 12 months of LAI values, bpch format
                                    on the GEOS-Chem 1x1 GRID

lai01.global                     -- LAI values for each month, ASCII format
lai02.global
lai03.global
lai04.global
lai05.global
lai06.global
lai07.global
lai08.global
lai09.global
lai10.global
lai11.global
lai12.global

vegtype.global                   -- Olson land types, ASCII format


Source:
===============================================================================
  
Michael Barkley (mbarkley@staffmail.ed.ac.uk)


Bob Yantosca has archived the MODIS LAI data in the directory (in his space):

   ~bmy/archive/data/MODIS_LAI_200911

which has the following subdirectories:

   raw_at_0.5x0.5_corrected_in_june2009/

      -- This directory contains MODIS collection 5 LAI product
         (raw monthly averaged product).  These files were downloaded from

     ftp://primavera.bu.edu/pub/datasets/MODIS/MOD15_BU/C5/LAI/data/monthly/

   bpch_June2009/  

      -- This directory contains MODIS collection 5 LAI product which has been 
         regridded to the GEOS-Chem resolutions.

   code_for_lai/  

      -- This contains the code used to make the MODIS LAI maps for GEOS-Chem.
         

The programs have to be run in this order to make the LAI maps:

	i)   modis_prep_v5.pro
	ii)  modis2_halfdeg_v5.pro
	iii) modis2_halfdeg_v5_to_laiv.pro
	iv)  do_modis_regridding_v5.pro  

Note: 

(a) modis2_halfdeg_v5_to_laiv.pro weights the LAI by the fraction of the
grid cell covered by vegetation. This 'fraction' is determined by summing 
the MEGAN PFTs (broadleaf, needleaf, grasses, crops & shrubs). If this is 
greater or equal to 1.0 then we assume cell is totally covered and set the 
fraction = 1.

The weighted LAI denoted: LAIv = ( LAI / fraction vegetated ) BUT it is set 
not to exceed the maximum LAI of that given month (Alex Guenther set the max 
LAIv = 6 which is slightly different to I've done).

The program checkplot_raw_pfts.pro is included to show how I summed the PFTs. 

(b) some of the paths may be hardwired - check before using!

(c) To read in the bpch files using gamap (I used v2.12) the following lines 
need to be added:

   ; Add in to the tracerinfo.dat file:
   AVHRR    AVHRR LAI                           0.e0  1     6901   1.0E+00 cm2/cm2
   MODIS    MODIS LAI                           0.e0  1     6902   1.0E+00 cm2/cm2

   ; Add in to the diaginfo.dat file:
   6900 MODIS                                    MODIS LAI