Abstract
The scattering from arbitrarily inclined leaves (SAIL) model was combined with the Jasinski geometric model to simulate canopy spectral reflectance and fraction of absorbed photosynthetically active radiation ( f APAR) for discontinuous canopies. This model is called the GeoSail model. Tree shapes are described by cylinders or cones distributed over a plane. Spectral reflectance and transmittance of trees are calculated from the SAIL model to determine the reflectance of the three components of the geometric model: illuminated canopy, illuminated background, and shadowed background. Although the GeoSail model is relatively simple, calculations of canopy reflectance and fraction of intercepted photosynthetically active radiation ( f IPAR) compared well with measurements collected in field experiments in forests in Minnesota and Oregon.
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