Modelling the scattering of light in arbitrarily complex media : Motivation for a ray tracing approachFunded under: JRC-REMSENS 4C
This document provides some background discussion on the state of the art in radiative transfer modelling, focusing on the description of the reflectance of natural surfaces and the specific contribution of computer graphics techniques. Synthetic imagery techniques have reached a very high level of realism to describe the light propagation in complex environments. Ray tracing offers some definite advantages over radiosity techniques because it has fewer constraints on the type of geometrical objects used to model the scene, on the optical properties attributed to the surfaces and on the illumination model. In addition, it allows a very modular approach to the problem. The outline of a forward ray tracer code designed specifically for physical investigations is presented. This concerns principally methods to model the canopy architecture, photon generation, ray-surface intersection, optical surface characterisation and lastly optimisation techniques. The potential follow-up studies of the ray tracing techniques combined with Monte Carlo methods are very wide and include canopy reflectance model validation as well as sensitivity and bio-physical studies.
Bibliographic Reference: EUR 15790 EN (1994) 26 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
Record Number: 199410876 / Last updated on: 1995-03-21
Original language: en
Available languages: en