A NOVEL MODIFIED GOLDSTEIN PHASE FILTER FOR PSInSAR BASED LINE OF SIGHT (LOS) DISPLACEMENT MAPPING OF JAKARTA, INDONESIA

The Persistent Scatterer SAR Interferometry is the most widely used remote sensing-based technology worldwide for Line of Sight (LOS) displacement measurements. However, SAR data often suffers from many phase distortions, which reduces the accuracy of LOS displacement measurements. Variations in incidence angles across the co-registered imageries in the interferogram are one of the expected causes of phase distortions. This study proposes slightly modifying the Goldstein phase filtering formula by adding an average incidence angle expression. The LOS measurements were observed to improve to the most widely accepted surface displacement values reported for the same study area by GNSS and LiDAR-based studies.