Physically-based Canopy Reflectance Model Inversion of Forest Structure from MODIS Imagery in Boreal and Mountainous Terrain using the BIOPHYS-MFM Algorithm Derek R. Peddle 1 * and Forrest G. Hall 2 1 Department of Geography, University of Lethbridge, WESB, 4401 University Drive West, Lethbridge, Alberta, T1K 3M4, Canada 2 NASA Goddard Space Flight Center, Code 614.4, 8800 Greenbelt Road, Greenbelt MD., 20771 USA and University of Maryland Baltimore County Joint Center for Earth Systems Technology (JCET) * Corresponding author: Dr. Derek R. Peddle, Professor Department of Geography University of Lethbridge Water and Environmental Science Building 4401 University Drive West Lethbridge, Alberta T1K 3M4 Canada Phone: +1.403.329.2524 Fax: +1.403.332.4039 E.mail: derek.peddle@uleth.ca Web: http://people.uleth.ca/~derek.peddle ABSTRACT The BIOPHYS algorithm provides innovative and flexible methods for the inversion of canopy reflectance models (CRM) to derive essential biophysical structural information (BSI) for monitoring, inventory and quantifying vegetation state and disturbance, and for input to ecosystem, climate and carbon models [1-9]. Based on spectral, angular, temporal and scene geometry inputs that can be provided or automatically derived, the BIOPHYS Multiple-Forward Mode (MFM) approach generates look-up tables (LUTs) that comprise reflectance data, structural inputs over specified or computed ranges, and the associated CRM output from forward mode runs. Image pixel and model LUT