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Title:   Author  item
                                            Fitzmaurice, Jeanitem
                                            Crow, Wade
  Submitted to: International Association of Hydrological Science
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/20/2010
                                    Publication  Date: 9/30/2010
                                    Citation: Fitzmaurice, J.A., Crow, W.T. 2010. Online vegetation parameter estimation using passive microwave remote sensing observations [abstract]. International Association of Hydrological Science. p. 26.Interpretive Summary:
                                Technical Abstract: In adaptive system identification the Kalman filter can be used to identify the coefficient of the observation operator of a linear system. Here the ensemble Kalman filter
is tested for adaptive online estimation of the vegetation opacity parameter of a radiative transfer model.  A state augmentation approach is used where the vegetation parameter is added to the soil moisture state vector. The filter consists of a two-layer soil hydrology model and the radiative tranfer model and is tested for a 184 day period with daily updates using simulated remote sensing observations.  Satisfactory estimation results are obtained for both static and idealized time-varying vegetation parameter cases.
Persistent excitation, adding small variance mean zero Gaussian noise, is required in the time-varying case to converge close to the true estimate, consistent with theory.
Besides surface soil moisture, vegetation information could be extracted from passive microwave observations using an adaptive system identification filtering approach.


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