Altimetry is a research area that involves the measurement of altitude or elevation of objects on the Earth's surface, typically using remote sensing techniques. This can be done using satellite or airborne sensors to accurately determine the height of land surfaces, ocean floors, ice sheets, and atmospheric layers. Altimetry data is crucial for studying topics such as sea level rise, ocean circulation, ice mass loss, and land topography. It plays a significant role in climate change monitoring, environmental research, and geophysical studies.