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


Autoria(s): López Sánchez, Juan Manuel; Vicente-Guijalba, Fernando; Ballester Berman, Josep David; Cloude, Shane R.
Contribuinte(s)

Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal

Universidad de Alicante. Instituto Universitario de Investigación Informática

Señales, Sistemas y Telecomunicación

Data(s)

07/01/2016

07/01/2016

01/02/2015

Resumo

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.

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.

Identificador

IEEE Geoscience and Remote Sensing Letters. 2015, 12(2): 249-253. doi:10.1109/LGRS.2014.2334371

1545-598X

http://hdl.handle.net/10045/52174

10.1109/LGRS.2014.2334371

A7715366

Idioma(s)

eng

Publicador

IEEE

Relação

http://dx.doi.org/10.1109/LGRS.2014.2334371

Direitos

© 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.

info:eu-repo/semantics/openAccess

Palavras-Chave #Synthetic aperture radar #Agriculture #Polarimetry #Rice #Teoría de la Señal y Comunicaciones
Tipo

info:eu-repo/semantics/article