New developments of 4D+ differential SAR Tomography to probe complex dynamic scenes

3D SAR Tomography exploiting multibaseline data is an important evolution of SAR Interferometry, to sense complex scenarios with multiple scatterers mapped in the SAR cell. This concept has been also integrated with multipass Differential Interferometry, producing the Differential Tomography (Diff-Tomo, “4D”) mode which furnishes “space-time” signatures of multiple (layover) dynamic scatterers. Diff-Tomo allows the joint resolution of multiple heights and deformation velocities of the scatterers mapped in a SAR pixel, i.e. 4-D (Multidimensional) SAR imaging, with applications e.g. in the monitoring of subsidences of complex urban areas and infrastructures. Moreover, Diff-Tomo has been also conceived in higher order version (“5D”), to extract information of layover nonuniform deformating scatterers, including the case of thermal dilations. In this paper, recent UniPI/RaSS Multidimensional Diff-Tomo work is extended, presenting latest 4D/5D algorithm advances and related first extensive trials with COSMO-SkyMed data. In particular, a new 5D single-look Diff-Tomo processor with superresolution capability and light computational burden for seasonal thermal dilation in layover zones is treated.