Assessment of the Contribution of Polarimetric Persistent Scatterer Interferometry on Sentinel-1 Data
Autor: | Jiayin Luo, Juan M. Lopez-Sanchez, Francesco De Zan, Jordi J. Mallorqui, Roberto Tomas |
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Přispěvatelé: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante. Departamento de Ingeniería Civil, Universidad de Alicante. Instituto Universitario de Investigación Informática, Señales, Sistemas y Telecomunicación, Ingeniería del Terreno y sus Estructuras (InTerEs), Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions |
Rok vydání: | 2022 |
Předmět: |
Interferometria
Atmospheric Science Interferometry Teledetecció Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] Polarimetry Sentinel-1 Remote sensing Computers in Earth Sciences Persistent scatterer interferometry (PSI) Deformation Persistent scatterer interferometry |
Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
ISSN: | 2151-1535 1939-1404 |
DOI: | 10.1109/jstars.2022.3206550 |
Popis: | Time series of Sentinel-1 data are widely used for monitoring displacements of the Earth surface using persistent scatterer interferometry. By default over land, Sentinel-1 images include two polarimetric channels: 1) VV and 2) VH. However, most works in this application exploit only the VV channel, whereas the VH channel is discarded for its lower amplitude. Thanks to the development of polarimetric persistent scatterer interferometry methods, one can integrate multipolarization channels into a single optimal one. Previous studies proved that the number and spatial density of measurement points is increased. In this work, we explore the reason why the VH channel increases the number of measurement points when using the amplitude dispersion ( DA ) as selection criterion. Results obtained over three geographical locations show that the VH channel helps in two ways. In the first place, the mean amplitude is increased for targets which have higher amplitude in VH channel, usually associated with rotated elements in the scene. In second place, and more importantly, the amplitude dispersion is decreased over many areas for which the VV channel exhibits fluctuations and peaks. Thanks to the insensitivity of the VH channel to these scene changes, it provides additional measurement points which are reliable despite their low amplitude. The increment of measurement points not only extends the spatial density and enables the detection of active deformation areas not found in the VV results but also provides more accurate results than only using the VV channel, thanks to the increased density of points, which helps the deformation estimation. This work was supported in part by the Spanish Ministry of Science and Innovation (State Agency of Research, AEI) in part by the European Funds for Regional Development under Projects PID2020-117303GB-C21 and PID2020-117303GB-C22, and in part by the framework of the ESA-MOST China DRAGON-5 project with ref. 59339. |
Databáze: | OpenAIRE |
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