Possibility of using the DInSAR method in the development of vertical crustal movements with Sentinel-1 data

Abstract

Abstract We investigate the possibility of using Differential interferometric synthetic aperture radar (DInSAR) to develop models of vertical crustal movements (VCMs). We determined VCM using the DInSAR method in the locations of four Polish GNSS stations: Borowa Góra, Borowiec, Lamkówko, and Józefosław. They are included in the International GNSS service and EUREF permanent GNSS networks. All Sentinel-1A and 1B satellite data were from 2020, and the time intervals of the created interferograms are 12 days, 24 days, and 336 days for each of the orbits: ascending and descending. We verified the calculated results of VCM based on GNSS data recorded by individual stations. We developed reference data with the precise point positioning (PPP) method. We confronted them with the Nevada Geodetic Laboratory service. The GNSS data covered larger time intervals than the synthetic aperture radar (SAR) data. To calculate daily positions with the PPP method we used GipsyX software. The obtained results of the directions of displacement are convergent between SAR and GNSS data. The values differ from each other, both between the types of orbits and GNSS data. The obtained results allow us to assume that SAR data developed using the DInSAR method may provide additional support in the development of VCM models in the Polish area, but they cannot be the only source of such results.