Underwater point cloud denoising method based on airborne LiDAR depth sounding system
A point cloud denoising and depth sounding technology, which is applied in the field of surveying and mapping science, can solve problems such as difficult threshold setting, poor denoising reliability, and unsatisfactory block noise removal effect, so as to eliminate block noise, improve reliability, Good denoising effect
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[0045] The airborne LiDAR (Light Detection And Ranging, laser detection and measurement) sounding system is an active sounding system, which uses a scanning measurement method to emit laser light from the air to detect water depth. The sounding system will emit infrared light during measurement operations. Laser pulses with two wavelengths of light and blue-green light. Among them, the infrared band is not easy to penetrate seawater and echoes after detecting the water surface, while the blue-green light with a wavelength between 0.47 and 0.58 μm has the smallest attenuation when penetrating seawater. With strong penetrability and good directionality, the blue-green band can detect the seabed, and the underwater depth can be calculated by calculating the echo time difference between the infrared laser pulse and the blue-green laser pulse. This method has incomparable advantages in coastal waters shallower than 50 meters, especially it can efficiently and quickly measure shallow...
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