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A Modification to Time-Series Coregistration for Sentinel-1 TOPS Data
| Content Provider | Directory of Open Access Journals (DOAJ) |
|---|---|
| Author | Xin Tian Zhang-Feng Ma Mi Jiang |
| Abstract | Very high requirement of co-registration accuracy better than 0.001 pixels for Sentinel-1 TOPS (Terrain Observation by Progressive Scan) mode presents a great challenge for application of SAR (synthetic aperture radar) interferometry in Earth Observation. The state-of-the-art techniques have demonstrated that the low coherence scenarios and abrupt loss of coherence between two arbitrary acquisitions are main sources of error to degrade the performance of TOPS time-series co-registration. In this paper, we present a modification to overcome both limitations through the coherence enhancement. The motive behind this is to improve the quality of observations before co-registration and meanwhile avoiding the coherence loss caused by fast decorrelation. To this end, principal components analysis based spatio-temporal filtering is first used to remove the artifacts in burst interferograms over strong noise areas. Rather than heuristically choosing a sub-set of interferograms as a small baseline technique does, we use Dijkstra's shortest path algorithm under graph theory framework to maximize the coherence of a sub-set interferograms. The performance of presented method against the state-of-the-art techniques is fully evaluated by synthetic data and a Sentinel-1A stack over a low coherence scene in Indonesia. Comprehensive comparisons demonstrate 9%-17% uncertainty reduction of time-series co-registration when applying our method. |
| Related Links | https://ieeexplore.ieee.org/document/9070171/ |
| e-ISSN | 21511535 |
| DOI | 10.1109/JSTARS.2020.2985503 |
| Journal | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Volume Number | 13 |
| Language | English |
| Publisher | IEEE |
| Publisher Date | 2020-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Ocean Engineering Geophysics. Cosmic Physics Coherence Coregistration Sentinel-1 Synthetic Aperture Radar (sar) Terrain Observation By Progressive Scan (tops) |
| Content Type | Text |
| Resource Type | Article |
