Analysis of Atmospheric Effects in Spaceborne InSAR - Towards Water Vapour Mapping Based on Multiple Sensors

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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Alshawaf, Fadwa; Fuhrmann, Thomas; Heck, Bernhard; Hinz, Stefan; Knoepfler, Andreas; Luo, Xiaoguang; Mayer, Michael; Schenk, Andreas; Thiele, Antje; Westerhaus, Malte (Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany)

Time delay due to the propagation of the signal through the atmosphere is considered as a major error source in repeat-pass synthetic aperture radar Interferometry (InSAR). Phase distortions observed in interferograms are most likely due to high spatially and temporally variable atmospheric water vapour. This effect can be exploited so that InSAR can be used as a tool for water vapour sounding. In this paper atmospheric phase screens (APS) derived from InSAR interferograms using Persistent Scatterer Interferometry (PSI) are presented. Besides, the paper shows a comparison of atmospheric phase screens with MERIS water vapour products.