Tropospheric heterogeneities corrections in differential radar interferometry

Differential radar interferometry (DInSAR) has been used more and more widely to monitor crustal deformations due to underground mining and oil extraction, earthquakes, volcanoes, landslides, and so on. However, tropospheric heterogeneities have been identified as one of the major errors in DInSAR, which can be up to 40 cm as derived from dual-frequency GPS measurements in the example given in this paper. Therefore, it is crucial to correct the tropospheric heterogeneities in the DInSAR results for monitoring crustal deformation. These corrections from several GPS stations in the radar imaging area can be interpolated and applied to the DInSAR results. The discussions are based on data from the Tower Colliery test site southwest Sydney, Australia.