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Water vapor is an important component of the Earth's atmosphere and is related to atmospheric energy transport, radiation balance, cloud formation, and precipitation (Trenberth et al., 2005). Precisely mapping (i.e., estimating) the spatial distribution of atmospheric water vapor with high resolution is important for understanding atmospheric dynamics (Emanuel et al., 1995). In the past two decades, spaceborne interferometric synthetic aperture radar (InSAR) techniques have shown great potential for mapping atmospheric water vapor (i.e., precipitable water vapor [PWV]) with unprecedented spatial resolution (∼10 m) over large areas (∼100 km) (

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