How often will the NISAR satellite map Earth's land and ice surfaces, providing detailed insights into surface changes?
Every 12 days
NISAR (NASA-ISRO Synthetic Aperture Radar), launched on 30 July 2025 aboard ISRO's GSLV-F16, is the world's first dual-frequency (L-band and S-band) SAR Earth-observation satellite.
From its 747 km Sun-synchronous polar orbit, NISAR's 240-km-wide imaging swath provides complete global coverage every 12 days on ascending and descending passes (sampling each spot on average every 6 days).
This 12-day revisit cycle allows researchers to build time-series interferograms and detect surface changes as small as a centimetre. Hence the correct answer is Every 12 days.
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