This is yet another multi-temporal interferometric SAR stacking approach introduced by (Berardino et al., 2002) to monitor small and gradual surface deformations. It depends on measuring the surface-radar line of sight (LOS) displacements in centimeter to millimeter accuracy (Gabriel et al., 1989) in (Berardino et al., 2002). The temporal behavior of targets can be monitored by relating the information extracted from a sequence of differential interferograms, however, SBAS approach necessitates a small orbital separation between each consecutive SAR acquisitions to reduce the spatial decorrelation and topography-induced errors as much as possible (Berardino et al., 2002).
This is what Usai 2001 said but I don't quite understand clearly what is highlighted in yellow and purple.
What I don't understand,
1) how many masters are selected for SBAS after the super unique master?
2) Can a single yet secondary master be used with more than one slave?
3) what is the basis of dividing small groups of differential interferograms into a number of independent subsets?
4) How are those independent subsets are linked together in order to retrieve a deformational time series?
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