The Role of Canopy Structure in the Spectral Variation of Transmission and Absorption of Solar Radiation in Vegetation Canopies Oleg Panferov, Yuri Knyazikhin, Ranga B. Myneni, Jörg Szarzynski, Stefan Engwald, Karl G. Schnitzler, and Gode Gravenhorst O. Panferov, K.-G. Schnitzler, and G. Gravenhorst are with the Institute of Bioclimatology University Göttingen, Büsgenweg 2, D-37077, Göttingen, Germany (e-mail: ggraven@gwdg.de; opanfyo@gwdg.de; kschnit@gwdg.de). Y. Knyazikhin and R. B. Myneni are with the Department of Geography, Boston University, 675 Commonwealth Avenue, Boston, MA 022150 (e-mail: jknjazi@crsa.bu.edu; rmyneni@crsa.bu.edu). J. Szarzynski is with Geographical Institute, Mannheim University, L9, 1-2, D-68131Mannheim, Germany (e-mail: anhuf@rumms.uni-mannheim.de). S. Engwald is with Botanical Institute, Bonn University, Meckenheimer Allee 170, D-53115 Bonn, Germany (e-mail: engwald@uni-bonn.de). Correspondence Yuri Knyazikhin Department of Geography, Boston University 675 Commonwealth Avenue Boston, MA 022150 Tel.: 617-353-8843 Fax: 617-353-8399 E-mail: jknjazi@crsa.bu.edu Submitted for publication in IEEE Transactions on Geoscience and Remote Sensing August, 1999