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- Title
Evaluación de métodos de análisis de sensibilidad global aplicados a modelos de trasferencia radiativa para cubiertas vegetales.
- Authors
Pablo Rivera, Juan; Gonzalo Saldarriaga, Luis; Verrelst, Jochem; Delegido, Jesús; Moreno, José
- Abstract
Plant radiative transfer models simulate the interaction of electromagnetic radiation with the different components of plant canopies. These models facilitate designing optical sensors and developing algorithms that enable estimating biophysical variables. The leaf-canopy PROSAIL model is mostly used in remote sensing applications. In this context, sensitivity analysis allows to seek for the variables that contributes most and least to the output reflectance data, which helps to an improved understanding of the functioning of the model. We have evaluated PROSAIL through global sensitivity analysis methods that provide total sensitivity index according to variance decomposition as proposed by Jansen and Sobol. Thereby, several probability density functions that define the input parameter space (i.e., uniform and normal) were analyzed for three phenological stages of vegetation (full, low and high range of chlorophyll content and LAI). Results demonstrate that Jansen's estimator performs most stable and robust to different probability density functions. Sobol's estimator showed large instabilities when using a normal distribution. Also, the range of the input parameter impacted Sobol's performance more than that of Jansen. The global sensitivity analysis method according to Jansen is preferred for gaining insight in models most influential and uninfluential parameters.
- Publication
UD y la GEOMÁTICA, 2014, Issue 9, p29
- ISSN
2011-4990
- Publication type
Article
- DOI
10.14483/udistrital.jour.udgeo.2014.9.a03