Abstract
Three-dimensional (3-D) computer models of vegetation represent a means to analyse the interactions between light and canopy structure, without requiring the turbid medium analogy used in transport theory. However, no field validations of such models have been presented until now. In this paper, we evaluate the ability of a computer model of maize constructed in earlier work from stereo-plotting to reproduce the properties of actual vegetation relevant to light interception. We compared the directional and bi-directional gap fraction distributions calculated from real and simulated hemispherical photographs. A good agreement was found between measurements and simulation, although the model slightly overestimated the gap fraction for zenith angles higher than 40°. Finally, stereovision appears to be able to provide realistic 3-D description of vegetation structure. Some directions for improving the method and possible applications are presented.
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