Onboard LiDAR depth sounding air-sea interface refraction correction method
A sounding and interface technology, applied in measuring devices, using re-radiation, and re-radiation of electromagnetic waves, etc., 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: 2019-05-14
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 onboard LiDAR depth sounding air-sea interface refraction correction method, and belongs to the technical field of the marine surveying and mapping. The method comprises thefollowing steps: firstly acquiring onboard LiDAR depth sounding data, and computing a sea surface laser point cloud coordinate from the onboard LiDAR depth sounding data; and then constructing an instantaneous three-dimensional sea surface model by utilizing the acquired sea surface laser point cloud based on the least squares and ocean wave spectrum theory; serving the constructed instantaneousthree-dimensional sea surface model as a ray tracing platform, tracing each laser beam penetrating the air-sea interface on the basis of acquiring the sea surface slope, and computing a refracted rayunit vector; and finally correcting the point location deviation and depth sounding error of the seabed laser point to realize the air-sea interface refraction correction of the onboard LiDAR depth sounding data. Through the method disclosed by the invention, the refraction correction on each laser beam of the air-sea interface is realized when performing the onboard LiDAR depth sounding, and therefracted ray path offset problem caused by instantaneous sea surface inclination is effectively solved.
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