THE SETTLEMENT OF HONG KONG INTERNATIONAL AIRPORT BASED ON THE INTERFEROMETRIC POINT TARGET ANALYSIS
- 1Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong SAR, China
- 2School of Environment Science and Spatial Informatics, China University of Mining & Technology, Xuzhou 221116, China
- 3Chinese Academy of Surveying and Mapping, Beijing, 100830, China
Keywords: Synthetic Aperture Radar (SAR), Regression, High-Accuracy, Airborne Interferometric SAR, Unwrapping error
Abstract. Hong Kong International Airport (HKIA) is one of the famous airports built by reclamation of the sea platform. However, the reclaimed area of the airport, which cost about $9 billion, has shown uneven displacement. Over the past two decades, researchers have used different methods to monitor the deformation of HKIA. As an emerging deformation monitoring technology, Interferometric synthetic aperture radar (InSAR), has been widely used to monitoring the deformation of HKIA in the last ten years. In this study, different from conventional interferometry, the target of this interference processing is single look complex (SLC) point data, which was extracted by points in the SLC data stacks (filtered by spectrum and backscatter intensity). We used 40 scenes of COSMO-SkyMed (CSK) SAR images to generate the differential interferogram point data. After multiple phase regression analysis, the SLC point data interferometric processing model can effectively eliminate baseline errors and atmospheric distortions, obtain highly reliable phase unwrapping results.