A directional multispectral forest reflectance model has been developed in the group of vegetation remote sensing at Tartu Observatory. The first version of the model was published in Nilson, T. and Peterson, U. A forest canopy reflectance model and a test case, Remote Sens. Environment, 37:131-142 (1991).
More recent publications on the new versions of the model and model applications can be found at Recent Publications.
The model is coded in Fortran, it compiles with f77 and gfortran (Fortran-95)
compilers.
The August 2003 version of the model is on the included CD-ROM of Liang,
S. Quantitative Remote Sensing of Land Surfaces, Wiley, 2004.
The current version (Version 04.2013) is of 17.04.2013.
To get the current version of the model please mail to
A. Kuusk, andres@to.ee
Here you can download the manual (PDF),
Version 04.2013,
Version 12.2012,
Version 08.2009,
and look at the Change.log.