[ Earth Observation Programmes ]
09 DEAI. 2025
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Orbiting Earth 180 degrees apart, the two-satellite HydroGNSS Scout mission uses a technique called Global Navigation Satellite System (GNSS) reflectometry to measure important climate variables such as soil moisture, freeze–thaw state over permafrost, inundation and biomass – all of which are linked to Earth’s water cycle. Embracing the New Space concept, HydroGNSS is one of ESA’s new Scout missions being developed within the Earth Observation FutureEO programme.
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![Source File [ 1.1 MB ]](https://media.esa.int/legacy/web/images/esa_multimedia/images/2025/10/hydrognss_scouting_for_water/26912191-1-eng-GB/HydroGNSS_Scouting_for_water.jpg?dl){kind=link}
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