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[–] 2 points 6 months ago (2 children)

NISAR

https://en.wikipedia.org/wiki/NISAR_(satellite) :

The NASA-ISRO Synthetic Aperture Radar (NISAR) mission is a joint project between NASA and ISRO to co-develop and launch an Earth observation satellite (EOS) equipped with dual-frequency synthetic aperture radar (SAR) in 2025. It will be the first radar imaging [emphasis added] satellite to use dual frequencies.

https://en.wikipedia.org/wiki/Imaging_radar :

Imaging radar is an application of radar which is used to create two-dimensional images, typically of landscapes. Imaging radar provides its light to illuminate an area on the ground and take a picture at radio wavelengths.

It is, in a literal sense, "spotting" the subsidence using visual techniques, albeit at a lower EM frequency than what humans can see.

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