ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume IV-3
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 245–250, 2018
https://doi.org/10.5194/isprs-annals-IV-3-245-2018
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 245–250, 2018
https://doi.org/10.5194/isprs-annals-IV-3-245-2018

  23 Apr 2018

23 Apr 2018

ADAPTIVE 4D PSI-BASED CHANGE DETECTION

Chia-Hsiang Yang and Uwe Soergel Chia-Hsiang Yang and Uwe Soergel
  • Institute for Photogrammetry, University of Stuttgart, Stuttgart, Germany

Keywords: Persistent Scatterer Interferometry (PSI), Synthetic Aperture Radar (SAR), Change Detection, Time Series Analysis, Urban Monitoring

Abstract. In a previous work, we proposed a PSI-based 4D change detection to detect disappearing and emerging PS points (3D) along with their occurrence dates (1D). Such change points are usually caused by anthropic events, e.g., building constructions in cities. This method first divides an entire SAR image stack into several subsets by a set of break dates. The PS points, which are selected based on their temporal coherences before or after a break date, are regarded as change candidates. Change points are then extracted from these candidates according to their change indices, which are modelled from their temporal coherences of divided image subsets. Finally, we check the evolution of the change indices for each change point to detect the break date that this change occurred. The experiment validated both feasibility and applicability of our method. However, two questions still remain. First, selection of temporal coherence threshold associates with a trade-off between quality and quantity of PS points. This selection is also crucial for the amount of change points in a more complex way. Second, heuristic selection of change index thresholds brings vulnerability and causes loss of change points. In this study, we adapt our approach to identify change points based on statistical characteristics of change indices rather than thresholding. The experiment validates this adaptive approach and shows increase of change points compared with the old version. In addition, we also explore and discuss optimal selection of temporal coherence threshold.