Abstract
Synthetic aperture radar (SAR) has the unique ability to precisely measure slow surface motions, and this capability is widely used in many applications. Most of these methods were developed in the last two decades, while the increase of available SAR data in recent years has allowed the use of these approaches in various scientific and commercial projects. Based on our long experience and 16 years of cooperation in the Dragon project, supported by bibliometric analysis, we argue that the recent advances in surface motion from SAR can be divided into three periods: data sparsity, availability, and ubiquity. The methodological development, however, antedates this progression. Therefore, we provide an overview of the methodological development of surface-motion estimation from SAR and discuss commercial advances in the field.
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