SAR technology is popular due to its relative cost-efficency as it enables users to monitor vastudareas. Free access to SAR data obtained by satellite Sentinel-1 of European Space Agency is audremarkable opportunity. In this study, we are testing the differential interferometry techniqueud(DInSAR) in the area of Slovenia, known for its dense vegetation that results in lowudcoherence and influences results greatly. In the first part of the study, we analizedudinterferogram coherence values throughout the year for different land use. We concluded thatudcoherence reaches its highest values between November and March, when there is no snow,udon urban areas and on arable land. We used interferograms with best coherence in the secondudpart of the study, where we measured subsidence due to mining activity in the area of Velenje.udWe compared subsidence results of DInSAR to those of GNSS measurements. To gainudacceptable results in the second part of our study, we had to reduce the test area down to audsmall urban part of Šaleška valley. Some of the final DInSAR results were close to the GNSSudsubsidence values. Low coherence and problematic phase unwrapping reduced the quality ofudour results greatly, but we estimate that atmospheric influence on phase has also contributedudto the data quality degradation. Results of this study offer a good starting point for those whoudwish to use Sentinel-1 data for radar interferomtery, especially in areas with dense vegetation.
展开▼
