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Water vapor removal of ASAR-derived InSAR products using MERIS data and GPS

Sina Adham Khiabani(1), Mohammad Reza Mobasheri(1), Mohammad Javad Valadan Zouj(1) and Maryam Dehghani(1)

(1) K.N.T.University of Tech., Remote Sensing Dep. K.N.Toosi University of Tech., Tehran, Iran


For more than a decade it has been found that atmosphere has a contaminative role on Interferometric Synthetic Aperture Radar (InSAR) measurements. Among the atmospheric phenomena and particles, water vapor has been introduced as the most influential error source by many researchers. Stacking and Calibration methods are two suggested strategies of water vapor removal of InSAR products. Among the various methods which has been studied from the other carried out activities and noted in this paper, a combination of an optical data (Medium Resolution Imaging Spectrometer, MERIS) and Global positioning system (GPS) measurements as a calibration method has been chosen to reduce the error. Since we have used Advanced synthetic aperture Radar (ASAR) data for interferometry purpose, MERIS is an appropriate data source due to the exact similarity of the acquisition times of MERIS and ASAR. Moreover, MERIS images include both water vapor transmitting and absorbing bands. On the other hand, water vapor products of optical data are significantly sensitive to some kinds of clouds. Furthermore, some overestimations were detected by other researchers in these products. Therefore GPS and some interpolative models have been utilized to make the results more accurate. The water vapor map was implemented to InSAR products and the results and their assessments will be noted in this paper.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry