Topography and Tree Height Estimation Based on the Best Normal Matrix Approximation for PolInSAR Coherence Region

SUN Ningxiao; WU Qiongzhi; Sun Lin

doi:10.11999/JEIT160774

Volume 39 Issue 5

May 2017

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SUN Ningxiao, WU Qiongzhi, Sun Lin. Topography and Tree Height Estimation Based on the Best Normal Matrix Approximation for PolInSAR Coherence Region[J]. Journal of Electronics & Information Technology, 2017, 39(5): 1051-1057. doi: 10.11999/JEIT160774

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SUN Ningxiao, WU Qiongzhi, Sun Lin. Topography and Tree Height Estimation Based on the Best Normal Matrix Approximation for PolInSAR Coherence Region[J]. Journal of Electronics & Information Technology, 2017, 39(5): 1051-1057. doi: 10.11999/JEIT160774

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Topography and Tree Height Estimation Based on the Best Normal Matrix Approximation for PolInSAR Coherence Region

doi: 10.11999/JEIT160774

1.
(School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China)
2.
(School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China)

Received Date: 2016-07-22
Rev Recd Date: 2016-11-11
Publish Date: 2017-05-19

Abstract

Abstract

The inversion of topography and tree height in forest area is one of the most important applications in the Polarimetric SAR Interferometry (PolInSAR). In this paper, the coherent region of the PolInSAR data is modeled and the best normal matrix is used to approximate the cross correlation matrix, further, the whitened interferometric cross-correlation matrix is obtained. The coherence region of the whitened interferometric cross-correlation matrix is a straight line. Two arbitrary coherences obtained under two different polarization states can be applied to fitting a straight line. Based on the fitting line, the topographical phase can be estimated successfully. Referring to the relationship between the volume scattering and the tree height, look-up table method is used to search the correct tree height. The proposed method can avoid the complex steps of the traditional method, which needs to solve all the coherences under different polarization states to obtain the edge of the coherent region. The proposed method simplifies the inversion procedure and improves the efficiency of inversion, meanwhile, achieves the correct topography as well as the tree height. Finally, the simulation data are applied to validating the validity and reliability of the proposed method.
- Polarimetric SAR Interferometry (PolInSAR),
- Coherent region,
- Best normal matrix approximation,
- Topography and tree height inversion

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References(20)

References

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