TY - JOUR AU - Bányai, László AU - Bozsó, István AU - Szűcs, Eszter AU - Gribovszki, Katalin Eszter AU - Wesztergom, Viktor TI - Monitoring Strategy of Geological Hazards Using Integrated Three-dimensional InSAR and GNSS Technologies with Case Study JF - PERIODICA POLYTECHNICA-CIVIL ENGINEERING J2 - PERIOD POLYTECH CIV ENG VL - 67 PY - 2023 IS - 4 SP - 992 EP - 1000 PG - 9 SN - 0553-6626 DO - 10.3311/PPci.20009 UR - https://m2.mtmt.hu/api/publication/34049353 ID - 34049353 AB - Geodetic/geodynamic benchmarks, equipped with both ascending and descending radar corner reflectors, and a method for integrated InSAR and GNSS/GPS network observation were developed and applied as the continuation of the former geodetic monitoring at the Dunaszekcső landslide, Hungary. The attempts to apply InSAR technologies using archive and Sentinel-1 data practically failed on the most intensive landside areas (“Vár” and “Szent János” hills), where proper persistent or distributed scatterers were not found. Our concept solved this problem, where the Simple Look Complex (SLC) images are used to interpolate the movements between two GNSS network observations using the integrated benchmarks and the method of Kalman-filtering. Since the InSAR line-of-sight (LOS) changes are barely sensitive to the north movements, this information is essentially provided by GNSS measurement alone, moreover, the GNSS measurements are used to: a) identify the benchmarks, b) detect the unwrapping errors and missing cycles and c) provide the boundary values of Kalman-filtering.After the installation of benchmarks three GPS observations were carried out and 69 ascending and 61 descending Sentinel-1 A and B images were processed. The data processing properly indicated the general movement history, which fit the curves of former geodetic observations, as well. The dense data points of the East and Up (vertical) components made possible more detailed geomorphologic interpretations of the ongoing process between two GPS observations. During the investigated periods the deceleration of movements was experienced, however, the deceleration of the dormant state needs the continuation of the monitoring. LA - English DB - MTMT ER - TY - JOUR AU - Rózsa, Szabolcs AU - Ács, Ágnes Mária AU - Ambrus, Bence AU - Bányai, László AU - Békési, Eszter AU - Bozsó, István AU - Égető, Csaba AU - Farkas, Márton AU - Gönczy, Sándor AU - Horváth, Roland AU - Juni, Ildikó AU - Khaldi, Abir AU - Lupsic, Balázs AU - Magyar, Bálint AU - Nagy, Lajos AU - Paláncz, Béla AU - Siki, Zoltán AU - Somogyi, Rita AU - Szakács, Alexandru AU - Szárnya, Csilla AU - Szűcs, Eszter AU - Takács, Bence AU - Tóth, Sándor AU - Turák, Bence Dávid AU - Vanek, Bálint AU - Völgyesi, Lajos AU - Wesztergom, Viktor TI - HUNGARIAN CONTRIBUTION TO THE RESEARCH ON POSITIONING AND APPLICATIONS (2019-2022) – IAG COMMISSION 4 JF - GEOMATIKAI KÖZLEMÉNYEK / PUBLICATIONS IN GEOMATICS J2 - GEOMAT KÖZL VL - 25 PY - 2022 IS - 1 SP - 41 EP - 50 PG - 10 SN - 1419-6492 UR - https://m2.mtmt.hu/api/publication/34190536 ID - 34190536 LA - English DB - MTMT ER - TY - BOOK AU - Wesztergom, Viktor AU - Bányai, László AU - Papp, Gábor AU - Benedek, Judit AU - Gribovszki, Katalin Eszter AU - Bozsó, István AU - Porkoláb, Kristóf AU - Békési, Eszter AU - Szárnya, Csilla TI - XII. Geomatika Szeminárium PY - 2022 UR - https://m2.mtmt.hu/api/publication/33220215 ID - 33220215 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Szűcs, Eszter AU - Gönczy, Sándor AU - Bozsó, István AU - Bányai, László AU - Szakacs, Alexandru AU - Szárnya, Csilla AU - Wesztergom, Viktor TI - Evolution of surface deformation related to salt-extraction-caused sinkholes in Solotvyno (Ukraine) revealed by Sentinel-1 radar interferometry JF - NATURAL HAZARDS AND EARTH SYSTEM SCIENCES J2 - NAT HAZARD EARTH SYS VL - 21 PY - 2021 IS - 3 SP - 977 EP - 993 PG - 17 SN - 1561-8633 DO - 10.5194/nhess-21-977-2021 UR - https://m2.mtmt.hu/api/publication/31960950 ID - 31960950 LA - English DB - MTMT ER - TY - JOUR AU - Bozsó, István AU - Bányai, László AU - Hooper, Andrew AU - Szűcs, Eszter AU - Wesztergom, Viktor TI - Integration of Sentinel-1 Interferometry and GNSS Networks for Derivation of 3-D Surface Changes JF - IEEE GEOSCIENCE AND REMOTE SENSING LETTERS J2 - IEEE GEOSCI REMOTE S VL - 18 PY - 2021 IS - 4 SP - 692 EP - 696 PG - 5 SN - 1545-598X DO - 10.1109/LGRS.2020.2984917 UR - https://m2.mtmt.hu/api/publication/31348863 ID - 31348863 AB - We present a new procedure and program system to integrate Sentinel-1 synthetic aperture radar (SAR) interferometry and Global Navigation Satellite System (GNSS) network observations to estimate 3-D surface changes caused by environmental processes. The procedure is based on the integrated geodetic/geodynamic benchmarks, which are equipped with both ascending (ASC) and descending (DSC) corner reflectors. The results of sparse GNSS observations are interpolated using the ASC and DSC line-of-sight changes provided by the Sentinel-1 mission every six days. The data integration is carried out using a Kalman filter where north, east, and up (vertical) coordinates and their instantaneous velocities are estimated and updated by the GNSS-derived data. The north components are essentially provided by the GNSS observations alone. The procedure was developed and successfully tested on landslide areas in Hungary. LA - English DB - MTMT ER - TY - JOUR AU - Bányai, László AU - Nagy, Lajos AU - Hooper, Andrew AU - Bozsó, István AU - Szűcs, Eszter AU - Wesztergom, Viktor TI - Investigation of Integrated Twin Corner Reflectors Designed for 3-D InSAR Applications JF - IEEE GEOSCIENCE AND REMOTE SENSING LETTERS J2 - IEEE GEOSCI REMOTE S VL - 17 PY - 2020 IS - 6 SP - 1013 EP - 1016 PG - 4 SN - 1545-598X DO - 10.1109/LGRS.2019.2939675 UR - https://m2.mtmt.hu/api/publication/31041582 ID - 31041582 LA - English DB - MTMT ER - TY - GEN AU - Czirok, Lili AU - Kuslits, Lukács AU - Bozsó, István AU - Gribovszki, Katalin Eszter AU - Bányai, László TI - Seismotectonic analysis using GIS and stress inversions in the SE-Carpathians PY - 2019 UR - https://m2.mtmt.hu/api/publication/30840189 ID - 30840189 LA - English DB - MTMT ER - TY - CHAP AU - Bozsó, István AU - Szűcs, Eszter AU - Bányai, László AU - Wesztergom, Viktor ED - Bacsárdi, László ED - Kovács, Kálmán TI - Exploitation of Sentinel-1 SAR data for studying geodynamic, tropospheric and ionospheric processes T2 - Proceedings of the 5th International Conference on Research, Technology and Education of Space (H-SPACE 2019) PB - Magyar Asztronautikai Társaság CY - Budapest SN - 9789637367182 PY - 2019 SP - 34 EP - 37 PG - 4 UR - https://m2.mtmt.hu/api/publication/30830770 ID - 30830770 AB - Radar images acquired by spaceborne SAR (Synthetic Aperture Radar) instruments have been used extensively by the scientific community for biomass estimation, surface deformation mapping and monitoring, land cover classification, flood mapping in the last twenty years. The availability of SAR scenes, however, was limited until the launch of the Sentinel-1 A and B satellites in 2014 and 2016, that ushered in a new age of SAR remote sensing, thanks to the open access data policy of the Copernicus Earth Observation Program of the EU. Sentinel-1 IWS (Interferometric Wide Swath) SAR acquisitions provide wide area coverage and ensure short revisit times (6 days in Europe, 12+ days outside of Europe). One of the main usages of SAR images is the interferometric processing, that yields so-called interferograms that contain the phase differences between two SAR scenes. The interferometric phase is the combination of different phase terms including surface deformation (if present), atmospheric, ionospheric, topographic, noise. The accurate estimation and separation of these terms allow the analysis of the (geo)physical and geodynamic processes related to the origin of the phase components. We wish to demonstrate that it is possible to separate the aforementioned phase components and use the resulting phase to study geodynamic and atmospheric phenomena such as landslide evolution (with the help of corner reflectors), large scale surface deformation trends in the Transylvanian Basin, change of water vapour content in the atmosphere and ionospheric electron content variations. LA - English DB - MTMT ER - TY - JOUR AU - Bozsó, István AU - Bányai, László AU - Szárnya, Csilla AU - Szűcs, Eszter AU - Wesztergom, Viktor TI - Monitoring 3D deformation of radar reflectors with the fusion of Sentinel-1 SAR interferometry and GNSS JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/30819814 ID - 30819814 AB - Space-borne radar interferometry (InSAR) is an excellent tool for measuring surface displacements. Using the phase information stored in the SAR images it is possible to calculate the phase difference due to surface movements between two acquisitions and from the differential phase, calculate the surface displacements. This method can be used reliably to create surface deformation time-series for mapping large areas and monitoring single reflecting targets. Some areas, however, are not suitable for InSAR analysis due to heavy vegetation or other factors that decrease phase coherence. In such cases, it is possible to install artificial reflecting objects (radar reflectors) that provide a stable phase over a long period of time. The MTA CSFK Geodetic and Geophysical Institute in collaboration with the Department of Broadband Infocommunications and Electromagnetic Theory of the Budapest University of Technology and Economics under ESA PECS project (project ID: 4000118850/16/NL/SC) developed such artificial reflectors. To overcome the other limitation of InSAR, namely that only deformation that is parallel to the satellite line-of-sight (LOS) can be measured, we have also carried out GNSS measurements at our reflector benchmarks. Three reflector networks were deployed in Hungary, two along the loess banks of River Danube, where landslide activity is frequent and one near Lake Balaton in an area affected by landslides as well. We used Sentinel-1 A and B satellite data between two GNSS campaign measurements (from July of 2016 to March of 2017) to calculate ascending and descending LOS displacements at our reflector benchmarks and through a technique called Kalman-filtering we fused data from ascending and descending satellite passes and the GNSS measurements to calculate the 3D displacements of our reflector networks, relative to a single reference reflector for each network. We present the 3D movements we have calculated with the previously described method at the three reflector networks and comment on the potential error sources and the possible improvements to our methodology. LA - English DB - MTMT ER - TY - CHAP AU - Szűcs, Eszter AU - Bozsó, István AU - Bányai, László AU - Szárnya, Csilla AU - Wesztergom, Viktor ED - Bacsárdi, László ED - Szűcs, Eszter ED - Wesztergom, Viktor TI - A topográfia-dinamika nagyléptékű leképezése: hazai Sentinel-1 radarinterferometriai eredmények T2 - A Magyar Űrkutatási Fórum 2019 válogatott közleményei PB - Magyar Asztronautikai Társaság CY - Budapest SN - 9789637367229 PY - 2019 SP - 69 EP - 72 PG - 4 UR - https://m2.mtmt.hu/api/publication/30819790 ID - 30819790 AB - A bolygó belső folyamatainak legszembetűnőbb és közvetlenül tapasztalható megnyilvánulása a topográfia-dinamika. Az ESA Sentinel-1 földmegfigyelő programja egyedülálló lehetőséget ad a felszíni folyamatok nagypontosságú, finom felbontású leképezésére mindezt nagy időbeli felbontással párosítva. A nagy időállandójú tektonikai folyamatok, infrastruktúra deformációk néhány mm/év nagyságrendű sebességgel jellemezhetők, ezek detektálására a módszer alkalmas, a korlátot a hullámterjedés okozta jelkésleltetés kvantitatív ismeretének hiánya jelenti, ami kiemelt jelentőséggel bír regionális léptékű folyamatok vizsgálatában. LA - Hungarian DB - MTMT ER -