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With the launch of NASA's Terra satellite and the MODerate Resolution Imaging Spectroradiometer (MODIS), operational Bidirectional Reflectance Distribution Function (BRDF) and albedo products are now being made available to the scientific community. The MODIS BRDF/Albedo algorithm makes use of a semiempirical kernel-driven bidirectional reflectance model(More)
The concept of canopy spectral invariants expresses the observation that simple algebraic combinations of leaf and canopy spectral transmittance and reflectance become wavelength independent and determine a small set of canopy structure specific variables. This set includes the canopy interceptance, the recollision and the escape probabilities. These(More)
The Compact High Resolution Imaging Spectrometer (CHRIS), to be launched on board the PROBA (Project for On-Board Autonomy) satellite in 2001/2002, will provide remotely-sensed data for terrestrial and atmospheric applications. The mission is intended to demonstrate the potential of a compact, low-cost, imaging spectrometer when combined with a small, agile(More)
The Botanical Plant Modelling System (BPMS) [1] [2] is used to simulate the directional reflectance of a barley canopy. The ability of linear BRDF model kernels to describe the directional reflectance of this canopy relatively accurately is confirmed. Rather than accepting this as a (form of) 'validation' of the simple model, a more interesting line is(More)
A complex geometric model for describing the 3D structure of plant canopies is presented. The Botanical Plant Modelling System (BPMS) allows a complete (topologically accurate) 3D geometric description of a canopy to be constructed. The model can be used for simulating the optical scattered radiation field of plant canopies, soil, or other topography(More)
A fieldwork campaign was undertaken in East Anglia, UK (52" 37.2' N 0" 32.0' E), during the winter/spring growing season of 1997. Manual structural measurements were made of individual plants from a variety of crops in order to allow detailed geometric representations of these plants to be constructed within the Botanical Plant Modelling System (BPMS) [1](More)
This paper presents a new method for constructing quickly and automatically precision tree models from point clouds of the trunk and branches obtained by terrestrial laser scanning. The input of the method is a point cloud of a single tree scanned from multiple positions. The surface of the visible parts of the tree is robustly reconstructed by making a(More)