Influence of Incidence Angle on the Coherent Copolar Polarimetric Response of Rice at X-Band

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Title: Influence of Incidence Angle on the Coherent Copolar Polarimetric Response of Rice at X-Band
Authors: Lopez-Sanchez, Juan M. | Vicente-Guijalba, Fernando | Ballester Berman, Josep David | Cloude, Shane R.
Research Group/s: Señales, Sistemas y Telecomunicación
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Instituto Universitario de Investigación Informática
Keywords: Synthetic aperture radar | Agriculture | Polarimetry | Rice
Knowledge Area: Teoría de la Señal y Comunicaciones
Issue Date: Feb-2015
Publisher: IEEE
Citation: IEEE Geoscience and Remote Sensing Letters. 2015, 12(2): 249-253. doi:10.1109/LGRS.2014.2334371
Abstract: The coherent nature of the acquisition by TerraSAR-X of both copolar channels (HH and VV) enables the generation of many different polarimetric observables with physical interpretation, as have recently been used for monitoring rice fields. In this letter, the influence of incidence angle upon these polarimetric observables is analyzed by comparing three stacks of images that were acquired simultaneously at different incidence angles (22°, 30°, and 40°) during a whole cultivation campaign. We show that the response of observables related to dominance (entropy, ratios of components) and type of scattering mechanisms (alpha angles) is not greatly influenced by incidence angle at some stages: early and advanced vegetative phases, and maturation. Moreover, the acquisition geometry drives the sensitivity to the presence of the initial stems and tillers, being detected earlier at shallower angles. This analysis is a necessary step before studying potential methodologies for combining different orbits and beams for reducing the time between acquisitions for monitoring purposes.
Sponsor: This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) and EU FEDER under Project TEC2011-28201-C02-02, and by the Generalitat Valenciana under Project ACOMP/2014/136.
ISSN: 1545-598X
DOI: 10.1109/LGRS.2014.2334371
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Peer Review: si
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