Timing Is Everything

The video tutorial explains the process of measuring ice elevation using laser light pulses from a satellite. Phil Lores, a deputy instrument system engineer, describes the importance of precise timing in calculating the time of flight of photons. The process involves transmitting billions of photons, detecting them, and managing noise to extract the signal. By calculating the time of flight, the distance between the spacecraft and the ground is determined, allowing for accurate elevation measurements. This technology adds a third dimension to earth mapping, enabling the study of changes across polar regions.

What challenges are faced when distinguishing laser photons from sunlight?

Describe how the elevation of ice is calculated using the time of flight of photons.