The role of Global Navigation Satellite Systems (GNSS) in water monitoring
Imagine a small coastal community at the periphery of a tropical storm. Hours before the first waves hit, an antenna smaller than a dinner plate begins detecting subtle changes in signal patterns from satellites thousands of kilometres overhead. Within minutes those changes reveal that the tide is rising far faster than normal. A sign of a storm surge. Warnings are issued and lives are saved. This is the power of Global Navigation Satellite Systems (GNSS) when used not only for navigation but as a tool for environmental sensing (Li et al. 2024).