全球海平面观测系统（Global Sea Level Observing System, GLOSS）是一个政府间海洋学委员会的计划，其目的是测量海平面全球长期气候变化的研究。自2004年印度洋地震后，该计划的目的已经改变为收集海平面的实时数据。该项目目前正在升级超过290台观测站，以使他们能够通过卫星向新设立的国家海啸中心发送实时数据。他们还在组装太阳能电池板，令观测站即使在恶劣天气下仍能够继续运作。

全球海平面观测系统与另一计划深海评估和报告海啸（Deep-ocean Assessment and Reporting of Tsunamis, DART）两者并非相互竞争，因为大部份GLOSS传感器都设于近岸地方，而DART传感器则设于深海地方。

The Global Sea Level Observing System (GLOSS) is an Intergovernmental Oceanographic Commission program whose purpose is to measure sea level globally for long-term climate change studies. The program's purpose has changed since the 2004 Indian Ocean earthquake and the program now collects realtime measurements of sea level. The project is currently upgrading the over 290 stations it currently runs, so that they can send realtime data via satellite to newly set up national tsunami centres. They are also fitting the stations with solar panels so they can continue to operate even if the mains power supply is interrupted by severe weather. The Global Sea Level Observing System does not compete with Deep-ocean Assessment and Reporting of Tsunamis as most GLOSS transducers are located close to land masses while DART's transducers are far out in the ocean.