Visualizing Global River and Lake Variations with Satellite Altimetry - SGB

Understanding water dynamics on a global scale is no longer limited to in-situ stations. Thanks to cutting-edge satellite altimetry technology, we now have unprecedented visibility into river and lake levels, even in the most remote regions. This website uses established altimetry data from the Jason and Sentinel satellite series, and is currently working to integrate SWOT (Surface Water and Ocean Topography), developed by CNES, NASA, and international partners, to enhance and densify the time series of previous satellites through an interactive web map.

This tool, developed by LEGOS, CNES, IRD, University Toulouse III, and Geological Survey of Brazil, allows users to:

• Monitor water surface heights, anomalies, and temporal changes globally
• Compare conditions over time (e.g. pre- and post-drought)
• Explore specific rivers or lakes with real-time data overlays

Why it matters:

• Classical Nadir Satellite altimetry and now SWOT fills critical observation gaps in ungauged basins
• The interactive map helps visualize the effects of climate extremes such as droughts and floods
• It serves as a valuable tool for researchers, basin authorities, and decision-makers

As part of the One Water Vision initiative, tools like this bring space-based hydrology closer to end-users, encouraging informed, equitable, and science-based water management.

Explore the map.