The UW-Madison SSEC and Boston University are pleased to announce the release of a software package that takes MODIS direct broadcast geolocation and surface reflectance files (MOD09_L2) as input and creates Bidirectional Reflectance Distribution Function (BRDF)/Albedo output tiled HDF files at 500 m and 1 km resolution. This process takes place in two phases:
Phase I: L2G Lite Surface Reflectance - generates land surface reflectances from MODIS Terra and Aqua data re-gridded to the MODIS Land Sinusoidal Tile Grid. (Example output filename: MYD09GA.A2009298.h08v05.hdf)
The MOD09_L2 Level 2 product that is required as input can be created as part of the IMAPP MODIS Virtual Appliance .
Phase II: BRDF/Albedo - models tiles of daily BRDF and Albedo from 16 days of land surface reflectance tiles.
(example output filename: MCD43B4_2009287h08v05.hdf)
The software can be downloaded through the IMAPP web site: http://cimss.ssec.wisc.edu/imapp/db_brdf_v1.0.shtml
Processing is executed through a single perl script which reads in the date/time window requested and the tiles to be processed and begins execution of the L2G (Phase I) processing for each tile. Once that has completed, the BRDF/Albedo (Phase II) software is executed. The script will use the HDFLook utility (http://www-loa.univ-lille1.fr/Hdflook/) if it is found on your machine, to create quick look true color images from the output 1km BRDF tile files, as well as a composite image of all of the tiles processed.
Both source and binary software are included. This release has been tested on both 32 and 64 bit Linux platforms and the statically linked 32 bit binary executables should work with most flavors of linux. There are also "Make" files that can be used to compile the software locally.
The DB BRDF software was provided by Dr. Crystal Schaaf and Dr. Yanmin Shuai of Boston University.
Cheers,
Kathy Strabala and James Davies