Estimation of InSAR Tropospheric Delay Using ERA-Interim Global Atmospheric Reanalysis
O. Ku (TU Delft - Civil Engineering & Geosciences)
Ramon Hanssen – Mentor
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Abstract
Tropospheric delays are considered to be one of the main performance limitations for Interferometric Synthetic Aperture Radar technology when applied to ground deformation monitoring. In this study, we evaluate the performance of ERA-Interim global atmospheric reanalysis on estimating the tropospheric delay on Sentinel-1 InSAR observations. The results are validated by four D-InSAR interferograms with small temporal/perpendicular baselines computed from Sentinel-1 observations. Based on the study, we concluded that the ERA-Interim global atmospheric reanalysis has relatively better performance in the regions with significant topography and stable atmospheric conditions.