Sadeghi, Z;
Zoej, MJV;
Muller, JP;
(2017)
Combination of persistent scatterer interferometry and single-baseline polarimetric coherence optimisation to estimate deformation rates with application to Tehran basin.
PFG - Journal of Photogrammetry, Remote Sensing and Geoinformation Science
, 85
(5)
pp. 327-340.
10.1007/s41064-017-0030-3.
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Abstract
This study reports on the monitoring of land subsidence in a rural area located in the southwest of the Tehran basin, Iran, by combining a persistent scatterer interferometry (PSI) method with a single-baseline polarimetric coherence optimisation. Owing to vegetation coverage in this rural area, coherence level experiences a decline and the performance and coverage of conventional interferometry to estimate deformation rate reduces concomitantly. Since the launch of satellites with polarimetric information, the polarimetric InSAR (PolInSAR) technique, which is vector interferometry with different polarimetric channels, has been introduced to optimise the coherence level. One of the most common criteria to select PS pixels is coherence and maximising the coherence can lead to an increased number of selected PS pixels and enhanced PSI performance. The single-baseline polarimetric coherence optimisation method assumes equal polarisation states at the end of each baseline. In order to apply this technique in our study, two different multi-look windows for coherence calculation and also two TerraSAR-X data sets with different numbers of images are used to assess their effect on the polarimetric PSI. Combi- nation of the single-baseline coherence optimisation method with PSI shows significant improvements (more than 50%) in terms of the number of selected PS pixels in the case study even using a data set with a small number of images. A 15 × 15 multi-look window selects a greater number of PS pixels compared to a 9×9 multi-look window, although this entails reducing spatial resolution. The most effective PSI approach in terms of the density of the selected PS turned out to be polarimetric PSI using a data set with a large number of images and a selection of a 15 × 15 multi-look window. Validation of the PSI methods using a large number of images with 9 × 9 and 15 × 15 multi-look windows via levelling measurements confirms the accuracy and reliability of the results obtained.
| Type: | Article |
|---|---|
| Title: | Combination of persistent scatterer interferometry and single-baseline polarimetric coherence optimisation to estimate deformation rates with application to Tehran basin |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s41064-017-0030-3 |
| Publisher version: | http://dx.doi.org/10.1007/s41064-017-0030-3 |
| Language: | English |
| Additional information: | © The Author(s) 2017. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| Keywords: | PSI, Single-baseline, PolInSAR, Coherence |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10058238 |
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