Abstract
Persistent Scatterer Interferometry (PS-InSAR) has become an indispensable tool for monitoring surface motion in urban environments. The interferometric configuration of PS-InSAR tends to mix topographic and deformation components in differential interferometric observations. When the upcoming constellation missions such as, e.g., TanDEM-L or TWIN-L provide new standard operating modes, bi-static stacks for deformation monitoring will be more commonly available in the near future. In this paper, we present an analysis of the applicability of such data sets for urban monitoring, using a stack of pursuit monostatic data obtained during the scientific testing phase of the TanDEM-X (TDX) mission. These stacks are characterized by extremely short temporal baselines between the TerraSAR-X (TSX) and TanDEM-X acquisitions at the same interval. We evaluate the advantages of this acquisition mode for urban deformation monitoring with several of the available acquisition pairs. Our proposed method exploits the special properties of this data using a modified processing chain based on the standard PS-InSAR deformation monitoring procedure. We test our approach with a TSX/TDX mono-static pursuit stack over Guangzhou, using both the proposed method and the standard deformation monitoring procedure, and compare the two results. The performance of topographic and deformation estimation is improved by using the proposed processing method, especially regarding high-rise buildings, given the quantitative statistic on temporal coherence, detectable numbers, as well as the PS point density of persistent scatters points, among which the persistent scatter numbers increased by 107.2% and the detectable height span increased by 78% over the standard processing results.
Highlights
Persistent Scatterer Interferometry (PS-InSAR) is a multi-temporal interferometric method that has been widely used for urban monitoring
Experimental results obtained in processing these pursuit monostatic data using both standard and proposed processing chains are displayed in the following paragraphs
The Pursuit Monostatic dataset in the Guangzhou test site is first processed with the standard processing method
Summary
Persistent Scatterer Interferometry (PS-InSAR) is a multi-temporal interferometric method that has been widely used for urban monitoring. The upcoming bi-static sensor missions promise even higher performance in global monitoring. In 2010, the TanDEM-X (TerraSAR-X Add-on for Digital Elevation Measurements) mission was launched. Together with TerraSAR-X (TSX), the constellation operates in a bistatic mode, with the primary goal of producing a highly accurate global digital elevation model (DEMs) of the Earth [10]. A secondary goal of the program is to demonstrate potential new applications of TanDEM-X (TDX) [11,12] and innovative new operating modes, including the bistatic, monostatic pursuit, and alternating bistatic modes, during the commissioning and scientific research phases of the mission [13,14].
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