the image you posted was probably done with Persistent Scatterer Interferometry. SNAP can only do ‘conventional’ DInSAR.
About the units, please have a careful look at this topic: Subsidence map in 3d view
the image you posted was probably done with Persistent Scatterer Interferometry. SNAP can only do ‘conventional’ DInSAR.
About the units, please have a careful look at this topic: Subsidence map in 3d view