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Comprehensive study of gravity waves’ influences on InSAR product and approach to remove the effect

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

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


As many scientists agreed, atmospheric water vapor has been known as the most influential effect on radar’s phase signals. Several strategies using spaceborn water vapor products, GPS networks and radiosonde data, have been suggested to remove the general characteristics of this error. The high sensitivity of spaceborn water vapor products, special conditions of radiosondes and network difficulties of GPS, makes special water vapor influences, difficult to remove. Gravity waves’ are from the types of phenomena which cause spatial inhomogeneous turbulences in atmospheric water vapor content. It will be shown that this phenomenon may result in intensive contaminations in SAR interferograms. Cloud generative feature of this phenomenon and high frequency turbulences in the amount of water vapor content make it very difficult to reduce by the conventional water vapor removal methods. Two types of strategies will be suggested in this paper in terms of the gravity waves removal of InSAR products. The first one is an image processing based method while the second one is the stochastic modeling method. The image processing based method was implemented on a gravity waves polluted interferogram. It will be shown that this method can be applicable in just restricted areas and with some conditions. Furthermore some stochastic modeling methods will be suggested 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