Pair Selection Optimization for InSAR Time Series Processing

The ever-increasing amount of Synthetic Aperture Radar (SAR) data motivates the development automatic processing chains to fully exploit opportunities offered by these large databases. Interferometry (InSAR) Mass Toolbox for Multidimensional time series is an optimized tool automatically download SAR data, select interferometric pairs, perform mass processing, compute geocoded deformation maps, invert and display velocity maps 2D on a web page updated incrementally as soon new image available. New challenges relate management load. We address them through methodological improvements dedicated optimizing InSAR pair selection. proposed algorithm narrows classical selection based shortest temporal spatial baselines thanks coherence proxy balances use each Primary Secondary images graph theory methods. apply three volcanic areas characterized with different climate, vegetation, characteristics: Virunga Volcanic Province (DR Congo), Reunion Island (France), Domuyo Laguna del Maule area (Chile-Argentina border). Compared solely baseline criteria, this produces similar while reducing total number computed differential interferograms up 75%, which drastically reduces computation time. optimization also allows reduce influence DEM errors atmospheric phase screen, increase signal-to-noise ratio inverted displacement series.