Point Density Reduction in Persistent Scatterer Interferometry

Conference: EUSAR 2012 - 9th European Conference on Synthetic Aperture Radar
04/23/2012 - 04/26/2012 at Nuremberg, Germany

Proceedings: EUSAR 2012

Pages: 4Language: englishTyp: PDF

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Wegmüller, Urs; Werner, Charles (Gamma Remote Sensing, CH-3073 Gümligen, Switzerland)
Frey, Othmar (Gamma Remote Sensing, CH-3073 Gümligen, Switzerland and Earth Observation and Remote Sensing, ETH Zürich, CH -8093 Zürich, Switzerland)

Persistent Scatterer Interferometry (PSI) is widely used to determine ground deformation rates and histories. The data sets processed are increasing in size due to larger areas considered, higher resolution, and higher point densities. Working with lists of several million points and related networks reduces the computational efficiency. In this paper a method to adaptively reduce the size of the point list is presented. Considering the local point density and a point quality measure points are removed such that the density is significantly reduced in areas of very high density while maintaining the available density in areas of lower density. The main PSI processing is then done for the reduced point list Later on the result obtained for the reduced list is expanded to the full point list In several cases this methodology improves the processing efficiency significantly.