Registration of dynamics of surface changes in the Southeren Part of the Upper Silesia (SW Poland) using DinSAR and PSI interferometry
Magdalena Czarnogorska(1), Marek Graniczny(1), Zbigniew Kowalski(1) and Urs Wegmüller(2)
(1) Polish Geological Institute, Rakowiecka 4, 00-975 Warsaw, Poland
(2) GAMMA Remote Sensing Research and Consulting AG, Worbstr. 225, CH-3073 Gümligen, Switzerland
The Polish Geological Institute (PGI) as a member of TerraFirma Consortium obtained Persistent Scatterer Interferometry (PSI) dataset as well as Differential Interferometry (DinSAR) datasets in May 2007 and January 2008. The area of datasets cover Southern part of the Upper Silesian Coal Basin at the territory of Poland and part of the coal basin at the territory of the Czech Republic.
Processing of the PSI data has covered scenes both ERS-1, ERS-2 and ASAR Envisat registered between 1992 and 2006. Processing of DinSAR data has covered 2 ALOS PALSAR scenes from 10.07.2007 and 25.08.2008.
Two-frame strips of PALSAR data over the Silesian Basin covering major coal mining areas in Poland and the Czech Republic are being used for monitoring mining induced surface deformation. The surface subsidence induced by the many active coal mines in the Polish Rybnik and the Czech Ostrava mining areas can be reliably identified in the georeferenced differential interferograms. For a relatively small section of this area the result of an ERS based Persistent Scatterer Interferometry (PSI) analysis is compared to the PALSAR differential interferogram. While the C-band result indicates low deformation rates and histories at mm precision there remains a huge information gap in the most strongly moving zones. The L-band result from PALSAR nicely complements this in that it provides information on the faster movements.
The highest amount of subsidence registered by PSI as e.g. -10 to -5 mm is identified as a oval-shaped boundaries of non-information polygons in PSI dataset, which are completed by L-band PALSAR highly dynamic data showing movements up to 20 cm. However, DinSAR deformation results directly correspond to local underground coal excavations and predicted coal subsidence basins, PSI datasets show regional movements indirectly connected with mining activity as well as tectonic structures. In Polish part of ”Ostrava-Rybnik image” PS subsidence values are present in vicinity of Jejkowice basin and Bzie-Czechowice deep fault zone in Czech part also two linear anomalis are visibles as a fault lines clouse to Havirov and Karvina. The USCB investigation area shows that satellite interferometry should be consider as a standard monitoring tool for hazardous mining areas.