Lazecký, Milan, Hatton, Emma, González, Pablo J, Hlaváčová, Ivana, Jiránková, Eva, Dvořák, František, Šustr, Zdeněk and Martinovič, Jan
(2020)
Displacements Monitoring over Czechia by IT4S1 System for Automatised Interferometric Measurements Using Sentinel-1 Data.
Remote Sensing, 12 (18).
p. 2960.
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Abstract
<jats:p>The Sentinel-1 satellite system continuously observes European countries at a relatively high revisit frequency of six days per orbital track. Given the Sentinel-1 configuration, most areas in Czechia are observed every 1–2 days by different tracks in a moderate resolution. This is attractive for various types of analyses by various research groups. The starting point for interferometric (InSAR) processing is an original data provided in a Single Look Complex (SLC) level. This work represents advantages of storing data augmented to a specifically corrected level of data, SLC-C. The presented database contains Czech nationwide Sentinel-1 data stored in burst units that have been pre-processed to the state of a consistent well-coregistered dataset of SLC-C. These are resampled SLC data with their phase values reduced by a topographic phase signature, ready for fast interferometric analyses (an interferogram is generated by a complex conjugate between two stored SLC-C files). The data can be used directly into multitemporal interferometry techniques, e.g., Persistent Scatterers (PS) or Small Baseline (SB) techniques applied here. A further development of the nationwide system utilising SLC-C data would lead into a dynamic state where every new pre-processed burst triggers a processing update to detect unexpected changes from InSAR time series and therefore provides a signal for early warning against a potential dangerous displacement, e.g., a landslide, instability of an engineering structure or a formation of a sinkhole. An update of the processing chain would also allow use of cross-polarised Sentinel-1 data, needed for polarimetric analyses. The current system is running at a national supercomputing centre IT4Innovations in interconnection to the Czech Copernicus Collaborative Ground Segment (CESNET), providing fast on-demand InSAR results over Czech territories. A full nationwide PS processing using data over Czechia was performed in 2017, discovering several areas of land deformation. Its downsampled version and basic findings are demonstrated within the article.</jats:p>
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | displacement measurement, High-Performance Computing, radar interferometry, synthetic aperture radar |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 19 Oct 2020 08:47 |
| Last Modified: | 17 Mar 2024 10:21 |
| DOI: | 10.3390/rs12182960 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3104583 |
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