Comparison between microwave coherent and incoherent scattering models for wetland vegetation in Poyang Lake area

Tao Xu; Jingjuan Liao

doi:10.1117/12.2069148

8 November 2014 Comparison between microwave coherent and incoherent scattering models for wetland vegetation in Poyang Lake area

Tao Xu, Jingjuan Liao

Author Affiliations +

Proceedings Volume 9260, Land Surface Remote Sensing II; 92600P (2014) https://doi.org/10.1117/12.2069148
Event: SPIE Asia-Pacific Remote Sensing, 2014, Beijing, China

Abstract

In order to reveal more deeply the scattering characteristics of wetland vegetation and determine the microwave scattering model suitable for the inversion of wetland vegetation parameters, the comparison and analysis between microwave coherent and incoherent scattering models for wetland vegetation in Poyang Lake area were performed in this paper. In the research, we proposed a coherent scattering model exclusive for wetland vegetation, in which, Generalized Rayleigh-Gans (GRG) approach and infinite-length dielectric cylinder were used to calculate single-scattering matrices of wetland vegetation leaves and stalks. In addition, coherent components produced from interaction among the scattering mechanisms and different scatterers were also considered and this coherent model was compared with Michigan Microwave Canopy Scattering (MIMICS) model. The measured data collected in 2011 in Poyang Lake wetland were used as the input parameters of the coherent and incoherent models. We simulated backscattering coefficients of VV, VH and HH polarization at C band and made a comparison between the simulation results and C-band data from the Radarsat-2 satellite. For both coherent and incoherent scattering model, simulation results for HH and VV polarization were better than the simulation results for HV polarization. In addition, comparisons between coherent and incoherent scattering models proved that the coherence triggered by the scattering mechanism and different scatterers can’t be ignored. In the research, we analyzed differences between coherent and incoherent scattering models with change of incident angle. In most instances, the difference between coherent and incoherent scattering models is of the order of several dB.

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Tao Xu and Jingjuan Liao "Comparison between microwave coherent and incoherent scattering models for wetland vegetation in Poyang Lake area", Proc. SPIE 9260, Land Surface Remote Sensing II, 92600P (8 November 2014); https://doi.org/10.1117/12.2069148

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KEYWORDS

Scattering

Vegetation

Backscatter

Rayleigh scattering

Electromagnetic scattering

Microwave radiation

Data modeling

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