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|Title:||An Inverse Radiative Transfer Model of the Vegetation Canopy Based on Automatic Differentiation|
|Authors:||VOSSBECK Michael; CLERICI Marco; KAMINSKI Thomas; PINTY Bernard; LAVERGNE Thomas; GIERING Ralf|
|Citation:||INVERSE PROBLEMS vol. 26 no. 9|
|Publisher:||IOP PUBLISHING LTD|
|Type:||Articles in periodicals and books|
|Abstract:||This paper presents an inverse model of the radiation transfer processes occurring in the solar domain in vegetation plant canopies. It uses a gradient method to minimise the misfit between model simulation and observed radiant fluxes plus the deviation from prior information on the unknown model parameters. The second derivative of the misfit approximates uncertainty ranges for the estimated model parameters. In a second step, uncertainties are propagated from parameters to simulated radiant fluxes via the model's first derivative. All derivative information is provided by highly efficient code generated via automatic differentiation of the radiative transfer code. The paper further derives and evaluates an approach for avoiding secondary minima of the misfit. The approach exploits the smooth dependence of the solution on the observations, and relies on a data base of solutions for a discretised version of the observation space.|
|JRC Directorate:||Sustainable Resources|
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