How deep in the ground can lidar detect?

As you can see, ground-penetrating radar can reach depths of up to 100 feet (30 meters) in low-conductivity materials, such as dry sand or granite. Wet clays, shale, and other high-conductivity materials can attenuate or absorb GPR signals, significantly reducing the depth of penetration to 1 meter (3 feet) or less. Therese Reinsch: When the LiDAR system collects the data (point cloud), all the LiDAR data points are declassified as to what they are impacting. Topographic LIDAR usually uses a near-infrared laser to map the Earth, while bathymetric LIDAR uses green light that penetrates the water to also measure the elevations of the seabed and riverbeds.