期刊
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
卷 12, 期 2, 页码 249-253出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2014.2334371
关键词
Agriculture; polarimetry; rice; synthetic aperture radar (SAR)
类别
资金
- Spanish Ministry of Economy and Competitiveness (MINECO)
- EU FEDER [TEC2011-28201-C02-02]
- Generalitat Valenciana [ACOMP/2014/136]
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 degrees, 30 degrees, and 40 degrees) 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.
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