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Calculation of actual motion components in vector domain for Persistent Scatterers

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Résumé

The combination of ascending and descending Persistent Scatterers Interferometric (PSI) data by means of resampling and/or spatial interpolation, separately for each Synthetic Aperture Radar (SAR) geometry, is a commonly followed procedure, limited though by the reduced spatial coverage and the introduced uncertainties from multiple rasterisation steps. Herein, an alternative approach is proposed for combining different PSI line-of-sight (LOS) observables in the vector domain, based on the geographic proximity of PS point targets. An alternative procedure is presented herein, using PS data in their initial vector format and by exploiting vector manipulation capabilities as well as the geostatistical modules already available in many GIS software packages. In the proposed post-processing scheme all necessary analysis steps are performed by means of attributes transfer and calculations between features geodatabases, prior to any rasterisation. By increasing the number of input point vectors during subsequent interpolation, the overall error budget coming from spatial interpolation is being reduced. The increase of output surface resolution together with the reduction of interpolation error budget for the combined PSI results is of significant importance during modelling of ground motion or integration of PSI measurements with GNSS observations. The benefit of working with vector data, instead of raster layers, especially in saving storage space should be more pronounced when large stacks of PSI or wide area processing results are involved. The proposed approach are applicable to any PSI dataset independently of the processing scheme. The advantages of the proposed vector-based approach compared to the commonly used grid-based procedure is being demonstrated using real data.
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Dates et versions

hal-01518710 , version 1 (05-05-2017)

Identifiants

  • HAL Id : hal-01518710 , version 1

Citer

Michael Foumelis. Calculation of actual motion components in vector domain for Persistent Scatterers. Fringe 2017, Jun 2017, Helsinki, Finland. ⟨hal-01518710⟩

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