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Reconstruction Of Ocean Surface Currents Using Near Simultaneous Satellite Imagery

We describe a new method of reconstruction of ocean surface currents based on motion detection at near simultaneous satellite images. Many world areas are regularly observed by pairs of satellites with small time intervals. In particular, Landsat 8 and Sentinel-2 pass over certain areas within a time interval of order of minutes every 2-12 weeks, while MODIS Terra and MODIS Aqua daily observe the majority of Earth surface with time interval of order of hours. In this study we show that motion detection at these pairs of near simultaneous satellite images obtained by optical flow algorithms is an efficient tool for precise reconstruction of ocean surface currents especially in areas with significant variability of ocean surface properties accompanied by distinct frontal zones. This method was applied for reconstruction of surface currents at several coastal regions at the Black, Kara, and Laptev seas influenced by river discharge.