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Natural Hazards

, Volume 80, Issue 1, pp 1–17 | Cite as

Ground deformation monitoring of Zhengzhou city from 2012 to 2013 using an improved IPTA

  • Hong-lei YangEmail author
  • Jun-huan Peng
  • Bao-cun Wang
  • Yong-ze Song
  • Ding-xuan Zhang
  • Lihua Li
Original Paper

Abstract

To address the low efficiency of interferometric point target analysis for processing high-resolution SAR data, this paper proposes a novel thinning method for interferometric point target and an improved filtering method to reduce the large-scale atmospheric phase delay. The thinning method is used to ensure the quality of PS point based on point density, by which points in low-density area are kept, while redundant points in high-density area are removed. Analyzing thinned PSs is helpful in quickly obtaining the initial atmospheric delay, which facilitates the temporal phase unwrapping and promotes the efficiency of parameter calculation. Meanwhile, this paper proposes a filtering method for large-scale atmospheric phase delay with the fusion of multi-looking, spatial filtering and spatial interpolation methods. This method is simple and quick, compared with traditional spatial filtering methods. The case study of Zhengzhou city from 2012 to 2013 verifies that this method doubles the efficiency of the traditional data processing methods. Also, the precision of deformation velocity in this case study is up to 3.16 mm/a based on the comparison with the ground leveling measurement.

Keywords

Small baseline subset Point density Ground deformation Zhengzhou city TerraSAR-X 

Notes

Acknowledgments

This work was supported by the following research projects: the National Natural Science Foundation of China (41304012, 61427802, 41330634, 41374016); the Fundamental Research Funds for the Central Universities (2652015180). The authors would like to thank anonymous reviewers who gave valuable suggestion that has helped to improve the quality of the manuscript.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Hong-lei Yang
    • 1
    Email author
  • Jun-huan Peng
    • 1
  • Bao-cun Wang
    • 2
  • Yong-ze Song
    • 1
  • Ding-xuan Zhang
    • 3
  • Lihua Li
    • 1
  1. 1.School of Land Science and TechnologyChina University of GeosciencesBeijingChina
  2. 2.Institute of SurveyingMapping and Geo-information of Henan Provincial Bureau of Geo-exploration and Mineral DevelopmentZhengzhouChina
  3. 3.University of Chinese Academy of SciencesBeijingChina

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