Abstract
As a technology of remote sensing and imaging geodesy, Synthetic Aperture Radar (SAR), which 11 can be spaceborne or airborne, has shown unique Earth observation capacity in recent decades. 12 Compared to optical remote sensing technology, SAR can work day and night without the need of 13 visible light, and possesses penetrating capacity to cloud, fog and some ground covers (e.g., vegetation, 14 ice, desert) to a certain degree. In particular, Interferometric SAR (InSAR) technology can be used to 15 monitor subtle ground surface deformation over large area with unprecedented resolution and accuracy, 16and has evolved into a routine method in the field of disaster and environmental monitoring.The volume of SAR data is growing at ever-increasing rates thanks to the lunch of numerous radar 18 satellites that can image the Earth under high resolution, multi-polarized and wide swath mode at short 19 repeat cycles. Such big SAR data, on one hand, challenge the conventional processing routines and 20 present opportunities for data-driven analysis technologies (e.g.
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