OBSERVATION OF CRYOGENIC PROCESS USING POLARIMETRY AND INTERFEROMETRY

The study focuses on extending the InSAR analysis of seasonal ground deformations to boreal forest regions, where monitoring ground deformation is crucial for understanding active layer dynamics in various ecological and geological conditions. During the summer season, the interferometric coherence is low for estimating displacement using InSAR. Therefore, displacement estimation is conducted during freezing seasons when coherence is relatively higher. To estimate the seasonal ground deformation during the winter season, the SBAS InSAR processing method was applied. However, to address the remaining spatial gaps resulting from decorrelation, dual-polarimetry SAR interferometry technique is employed to compensate for the spatial gaps. Additionally, to assess the magnitude of ground deformation during the freezing season, a piecewise linear model based on the Stefan solution was proposed to examine the temporal deformation pattern associated with the progression of the freezing front in the soil, allowing for the interpretation of hydrological characteristics in active layer.