radar altimetry

Radar altimetry is a technology that measures altitude above the Earth's surface by emitting radio waves from an aircraft or satellite toward the ground and timing how long they take to bounce back. By calculating this time and knowing the speed of radio waves, the system determines the precise distance to the terrain below. This method provides detailed elevation data useful for mapping, oceanography, and studying Earth's topography, especially over vast or remote areas. It’s a valuable tool for understanding changes in sea level, terrain, and ice sheets.