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Climate & Radiation
Geodesy and Geophysics
Wallops Field Support
Brown Bag Seminar: Jeremy Rubio
Cesbio, Tolouse, France
Wednesday, February 27, 2008 - 22:00
Developed at CESBIO since 1992, DART (Discrete Anisotropic Radiative Transfer) model was patented in 2003. It is freeware for scientific activities. With the support of CNES, Magellium developed a professional version of DART that works on Linux and Windows systems. DART is a 3D model that simulates radiative transfer in the "Earth-Atmosphere" system, for any wavelength in the optical domain (visible, thermal infrared, etc.). It uses an innovative approach that combines the ray tracing and the discrete ordinate methods. It works with natural (forests, lakes...) and urban (Buildings, roads...) landscapes with topography and atmosphere. DART simulates any landscape as a 3D matrix of cells that contain turbid and/or opaque surfaces. "Turbid" material is well adapted for simulating vegetation such as tree crowns, grass and agricultural crops. Opaque surfaces are well adapted for simulating surfaces such as ground, urban elements and tree trunks. Moreover, DART can use data bases about the structural and spectral properties of the elements (e.g., atmosphere, leaves and soils) that make up the landscape. A friendly Graphic User Interface (GUI) allows the user to input landscape simulation parameters and to display simulation outputs such as 3D display of the landscape and simulated images. There is the possibility of multiple forward simulations. The 2 major DART products are: - remote sensing images for any direction and altitude within the atmosphere (definition of future sensors, sensitivity studies, strategies for the inversion of satellite images for obtaining surface biophysical parameters (LAI, etc.)). - 3-D budget of absorbed, scattered, intercepted and emitted radiation. Next version (3.0.1) (spring 2008) will include the creation of Look Up Tables and a module that inverts satellite images. The next big step will be the coupling of DART with the PovRay simulator (urban and natural landscapes).