A refraction correction method for airborne lidar sounding sea-air interface
An interface and sounding technology, which is applied in the direction of measuring devices, utilizing re-radiation, and re-radiation of electromagnetic waves, can solve problems such as offset, and achieve the effect of improving the accuracy of sounding and solving the offset of refracted light paths.
Active Publication Date: 2022-03-04
SHANDONG UNIV OF SCI & TECH
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[0005] Aiming at the above-mentioned technical problems existing in the prior art, the present invention proposes an airborne LiDAR bathymetric sea-air interface refraction correction method, which is reasonably designed, solves the problem of refracted light path deviation caused by instantaneous sea surface tilt, and effectively improves the airborne LiDAR. LiDAR Sounding Accuracy
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[0059] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0060] The invention provides an airborne LiDAR bathymetric sea-air interface refraction correction method, the process of which is as follows figure 1 shown. The refracted light path deviation caused by the instantaneous sea surface tilt during the airborne LiDAR sounding process, such as figure 2 shown. The correction method specifically includes the following steps:
[0061] Step 1: Obtain the airborne LiDAR bathymetric data, and calculate the instantaneous sea surface laser point coordinates;
[0062] Specifically, the airborne LiDAR sounding system is used to obtain sounding laser data. Among them, the effective sounding laser point refers to removing the laser point on the land, leaving only the laser point on the water surface.
[0063] In a further embodiment, step 1 specifically includes the following steps:
[0064] Step 1.1: Ob...
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The invention discloses an airborne LiDAR sounding sea-air interface refraction correction method, which belongs to the technical field of marine surveying and mapping, and comprises the following steps: firstly, the airborne LiDAR sounding data is obtained, and sea surface laser point cloud coordinates are calculated; Based on multiplication and wave spectrum theory, the instantaneous 3D sea surface model is constructed by using the acquired sea surface laser point cloud; then the constructed instantaneous 3D sea surface model is used as a ray tracing platform, and each laser beam passing through the air-sea interface is traced on the basis of obtaining the slope of the sea surface , to calculate the unit vector of refracted rays; finally, the point deviation and sounding error of the seabed laser point are corrected to realize the air-sea interface refraction correction of the airborne LiDAR sounding data. Through this method, the present invention realizes the refraction correction of each laser beam at the sea-air interface during airborne LiDAR sounding, and effectively solves the problem of refraction light path deviation caused by instantaneous sea surface inclination.
Description
technical field [0001] The invention belongs to the technical field of marine surveying and mapping, and in particular relates to an airborne LiDAR bathymetric sea-air interface refraction correction method. Background technique [0002] The airborne LiDAR sounding system has the characteristics of high measurement accuracy, high measurement point density, high work efficiency, strong mobility, and continuous measurement. It is especially suitable for rapid detection of complex terrain such as shallow water areas and areas near islands and reefs. It can realize coastline Seamless mosaic of above and below water terrain. It is of great significance to meet the urgent needs of ocean, surveying and mapping, water conservancy, transportation, diplomacy, navy and many other aspects. [0003] Due to the influence of external factors such as waves and tides, the sea surface continues to fluctuate randomly, changing the geometry of the air-sea interface. When the blue-green laser ...
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IPC IPC(8): G01S17/08G01S7/497
Inventor 宿殿鹏阳凡林马跃杨安秀卜宪海亓超
Owner SHANDONG UNIV OF SCI & TECH