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Model: Drat

Phase: RAMI 2

The drat model is an efficient Monte Carlo ray tracing (MCRT) model, which is driven by 3D locations and orientations of scattering elements (including triangles, spheres, cylinders, spheroids, ellipsoids, Bezier patches etc.) combined with descriptions of radiometric properties of the primitive set (reflectance, transmittance at specified wavelengths). This model has been used in a number of simulation studies and has been shown to agree with both measurements and other models of canopy scattering (Liang, 2004; Pinty et al., 2004).

Example of vegetation canopies simulated with the drat model: Scots pine trees (5 - 50 years).
Example of vegetation canopies simulated with the drat model: Scots pine trees (5 - 50 years).
Example of vegetation canopies simulated with the drat model: 3d model of a barley canopy.
Example of vegetation canopies simulated with the drat model: 3d model of a barley canopy.
Three-dimensional plant modelling for remote sensing simulation studies using the botanical plant modelling system
Lewis, P., Three-dimensional plant modelling for remote sensing simulation studies using the botanical plant modelling system (1999), Agronomie - Agriculture and Environment, 19, 185.210, DOI: 10.1051/agro:19990302.
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Comparison of Hymap/E-SAR data with models for optical reflectance and microwave scattering from vegetation canopies
Saich, P., Lewis, P., Disney, M., and Thackrah, G., Comparison of Hymap/E-SAR data with models for optical reflectance and microwave scattering from vegetation canopies (2001), in Proceedings of Third International Workshop on Retrieval of Bio- and Geo-Physical Parameters from SAR data for Land Applications, 427.
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Online