On the Mitigation of Atmospheric Phase Delay Artefacts in Interferometric Sar Time Series

In this paper, differential maps of total zenith delay (TZD) estimated by GPS and by Weather Research and Forecasting Model (WRF) numerical data are compared with the TZD by Synthetic Aperture Radar (SAR) Interferometry. This maps are generated by processing a set of interferometric SAR images acquired by the ENVISATASAR mission over the Lisbon region from April to November of 2009. To obtain TZD maps from the delay estimated by GPS data, we used MERIS data to fit a parametric model to the empirical variogram, and used the best fit model in the ordinary kriging system of equations. The WRF model is used to model the TZD over the study area at about the same time of SAR acquisitions. The performance of the TZD-GPS and TZD-WRF maps were compared with each other.