NDLI: Model Limitations and Parameter-Estimation Methods for Agricultural Applications of Polarimetric SAR Interferometry

Content Provider	IEEE Xplore Digital Library
Author	Lopez-Sanchez, J.M. Ballester-Berman, J.D. Marquez-Moreno, Y.
Copyright Year	1980
Abstract	Application of polarimetric synthetic aperture radar interferometry to the retrieval of geophysical parameters from vegetated scenes is based on simple direct models of such scenes. The first part of this paper presents an analysis of the correspondence between these simple models, namely, the random volume over ground and the oriented volume over ground (OVoG), and experimental data from samples of two agricultural crops (maize and rice) acquired in controlled conditions. Although an overall agreement between model and data is clear, some discrepancies have been found as a consequence of two assumptions in the model formulation: vertical homogeneity of the vegetation volume and absence of multiple scattering effects inside the volume. This paper presents the shape and location of the visible region of the experimental coherences on the complex plane and compares it with the feasible region predicted by the model. This comparison has also pointed out the low sensitivity of the direct model to extinction coefficients. In the second part, two different strategies for a complete inversion (i.e., estimation of all model parameters) of the OVoG model are proposed and compared, using the same data set. The first one is based on a combination of geometrical and numerical approaches (genetic algorithms) and the second one on a dual-baseline configuration. In all cases, ground topography is accurately estimated, with a maximum error of 10 cm. Vegetation height estimates are accurate up to 30 cm, with some bands and baseline configurations providing errors below 15 cm. However, results obtained for the extinction coefficients are not stable with frequency and exhibit high variability.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	3481
Ending Page	3493
Page Count	13
File Size	726418
File Format	PDF
ISSN	01962892
Volume Number	45
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interferometry Layout Vegetation Extinction coefficients Polarimetric synthetic aperture radar Crops Radar scattering Shape Predictive models Genetic algorithms vegetation Agriculture dual baseline genetic algorithms parameter retrieval polarimetric synthetic aperture radar interferometry
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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