What technology is used in Airborne LIDAR Hydrography to rapidly measure seabed depths?

In Airborne LIDAR Hydrography, LIDAR (Light Detection and Ranging) technology is utilized to quickly and accurately measure seabed depths. This method employs laser pulses emitted from an aircraft, which interact with the water surface and the seabed. The time it takes for the laser pulses to return to the aircraft is measured, allowing for precise calculations of distance. The key advantage of LIDAR in this context is its ability to provide high-resolution topographic data in a relatively short timeframe, which is particularly useful in mapping coastal areas, shallow waters, and underwater features.

Airborne LIDAR can effectively penetrate the water surface, enabling surveys of large areas with less interference compared to traditional methods. This capability makes LIDAR an ideal choice for hydrographic surveys where rapid data acquisition is crucial. On the other hand, Sonar and Radar technologies have their own applications but do not provide the same level of detail or efficiency in measuring shallow water depths as LIDAR does. GPS is used for positioning and navigation but does not directly measure depths.