How to obtain a more comprehensive collection of coherent points from interferometric datasets and analyze deformation time-series is the difficult and hot spot in current research. An improved coherent targets technology is proposed, which can obtain a more comprehensive and reliable collection of coherent points and improve temporal-spatial resolution and precision of deformation signal. Based on similar backscattering properties of the same ground object, non-parametric hypothesis test is used to extract the homogeneous pixels and nonlocal filter is applied to improve the quality of interferogram. Meanwhile, the systematic phase is removed based on multi-resolution maximum likelihood estimation (MLE) of fringes algorithm, then the coherence of homogeneous pixels is estimated stationarily. Thereby more coherent points can be obtained. 20 TerraSAR-X stripmap images are exploited by the conventional CT and the proposed method to investigate the ground deformation of the reclaimed lands in Hong Kong. Experimental results show that this method can effectively improve the density of coherent points in the reclaimed lands with sparse vegetation and obtain a more reliable result.
WANG Mingzhou
,
LI Tao
,
JIANG Liming
,
XU Kan
,
WU Wenhao
. An Improved Coherent Targets Technology for Monitoring Surface Deformation[J]. Acta Geodaetica et Cartographica Sinica, 2016
, 45(1)
: 36
-43
.
DOI: 10.11947/j.AGCS.2016.20140617
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