Each year on June 21 , the world commemorates 🌐 World Hydrography Day , a global celebration led by the International Hydrographic Organization (IHO) . While many associate hydrography with ship navigation and nautical charts, the real power of this science goes far deeper—into the very survival of our planet in the face of climate change , rising sea levels, and the digital transformation of our oceans. 🛰️ Beyond Charts: The Role of Hydrography in Climate Monitoring Hydrography —the science of measuring and describing the physical features of oceans, seas, coastal areas, lakes, and rivers—is a critical tool in assessing the impact of climate change . According to the United Nations Decade of Ocean Science for Sustainable Development , data from hydrographic surveys are essential in tracking coastal erosion , sea-level rise , and ocean warming . These changes, once invisible to the naked eye, are now precisely mapped using advanced technologies such as multibeam sonar , LiDAR , a...