S1TBX-SE-2 Multi-Master InSAR Support Tools


A key processing step in InSAR use cases is to estimate the complex correlation or coherence (both amplitude and phase values) between multiple SAR images. These images are expected to have been coregistered in advance, and it is therefore assumed that they have been acquired using the same sensor, orbit track, and imaging mode. Depending on the selected pairs of images, this complex correlation may be affected by changes in the acquisition geometry (spatial baseline), temporal decorrelation (due to temporal baseline), changes in Doppler centroid, and choice of polarimetric channels. From these complex correlations, other parameters of interest can be derived. For example, nonzero spatial baselines allow for deriving DEMs; nonzero temporal baselines allow for deriving line-of-sight deformation time series; different polarimetric channels allow for identifying scattering mechanisms.The implementation of this enhancement will provide a GUI for:1. Selecting (a directory of) SLC products to be coregistered.2. Selecting (a subset of) all interferometric image pairs manually (interactively/visually) or based on a set of parameters (e.g., perpendicular baseline, temporal baseline, Doppler centroid difference). See, also, S1TBX-SE-3. Note: if the output product will be used by single-master PSI software packages, interferometric pairs should be given with respect to a single master.3. Coregistering a stack that includes only images corresponding to the previously-selected interferometric pairs. One of these images will be selected as master. 4. Creating interferograms based on the previously selected pairs. Interferogram formation is followed by the compensation of all known ellipsoid and topographic information.5. (Optional) Boxcar spatial filtering (also known as complex multilooking) of interferograms for phase estimation.6. (Optional) Export for use in external software packages (e.g., StaMPS; see S1TBX-SE-4).The output product (or product group) would include:1. Bands related to:a. Coregistered stack of SLCs (master and slaves).b. Interferograms.c. DEM used for topographic compensation.d. Height-to-phase factors (also known as vertical wavenumber; S1TBX-SE-24), which depend on DEM used for topographic phase compensation.e. Latitude/longitude coordinates based on DEM used for topographic phase compensation.f. Incidence angle (this, together with the orbit inclination can be used for combining ascending and descending orbits; see S1TBX-SE-11).






Lisa House

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