Science Service System

Summary of Proposal GEO3018

TitleTerraSAR-Xtime-series analysis for monitoring surface deformation in Ha Noi, the capital of Vietnam
Investigator Chang, Chung-Pai - Center for Space and Remote Sensing Research, National Central University
Team Member
Mr Le, Tuan - Center for Space and Remote Sensing Research, National Central University
Professor Yen, Jiun-Yee - Department of Natural Resources and Environment, National Dong Hwa University
Ms Yhokha, Akano - Department of Geophysics, National Central University
SummaryExecutive Summary

Ha Noi, which is the capital of Vietnam, is considered as a good example of how rapid urbanization influences the ground stability in a developing country. In this project, we attempt to apply Radar Interferometry to measure the level of surface deformation for this area at large-scale level. The methodology takes the advantages of Advanced Interferometric Synthetic Aperture Radar (InSAR) and fine-resolution X-band radar data for precisely determine the level of ground deformation. Generally, the method can be described as three basic steps:

  • The first step is to apply the Persistent Scatterer InSAR (PSInSAR) technique. This method extracts the phase signal of the chosen PS points for the study.
  • The second step is used the Small BAseline Subset (SBAS) technique. This method is based on interferograms that are first multi-looked and then individually phase unwrapped. In order to maximize the correlation of the interferograms formed, small baseline methods seek to minimize the perpendicular, temporal and Doppler baselines, and the difference between the Doppler centroids of acquisition pairs.
  • Finally, we use those two methods data to obtain the Multi temporal (MT-InSAR) result. This method will be able to extract the signal with greater coverage than either method alone. A method will be proposed to overcome the effect of ionosphere and troposphere layers that was well know significantly affect X-band radar data.

Different kinds of data will be collected include:

  • GPS and levelling data: for results evaluation and might be used for Zenith Wet Delay calculation. The data will be provided by Vietnam Academy of Science and Technology. A field trip will be conducted for collect others field data.
  • SAR data: X-band radar data is required for good temporal and spartial resolution. Archived TerraSAR-X is the most appropriate candidate for this requirement. The data will be provided (if happens) by German Aerospace Center(DLR). This is archive imagery which is provided based on the AO FOR UTILIZATION OF THE TERRASAR-X ARCHIVE. The data could be delivered by online files transfer or direct DVD delivery.
  • Optical imagery: MODIS data might be considered to use to calculate Zenith Wet Delay

This research will be funded by Ministry of Science and Technology (erstwhile National Science Council), Taiwan as a part of Indo-Taiwan Joint Research Program.

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