摘要：The Trifon Zarezan landslide is one of the well-studied areas north of Varna. It has been registered in 1998 and monitored since then, but due to expansion of construction activities and lack of sewerage facilities in 2005 it exhibited strong activation seriously damaging the panoramic coastal road remaining closed up to nowadays. One important issue in mitigating the effect of this phenomenon is its continuous monitoring and one promising solution of this problem is the usage of differential Synthetic Aperture Radar interferometry In the framework of this study two sources of data have been used – three geodetic surveys and SAR data from C-SAR instrument onboard Sentinel-1. The main research objective was to combine the advantages offered by both data sources in order to produce regularly updated information about the whole site. The GNSS data are precise, but does not originate from dense geodetic network, while SAR data cover the whole area, but they lack of high spatial resolution which is disadvantage in case of exploring small areas such as this one. Based on the results achieved it can be concluded that both sources of data provide complementary information confirming the overall behavior of the studied phenomena for the time period analyzed.
