As reported here Terrain correction bug still after the update of the toolbox when the graphs are used the operator multitemporal filter points to something wrong
Multi-Temporal speckle filtering will be much improved in SNAP3.0, it will be possible to use any single-image speckle filter in it and all the assorted parameters.
I wonder how the spatial filters are included in the multi-temporal filtering procedure? Any reference about that (the SNAP help is not updated in this section). Thanks in advance.