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A registration method for airborne laser bathymetry data based on characteristic curves

A characteristic curve and airborne laser technology, applied in image data processing, computer components, image analysis, etc., can solve the problems of registration data quality that needs to be further improved, underwater registration features are rare, and initial flight belt quality is poor , to achieve reliable solutions, improve precision, improve efficiency and accuracy

Active Publication Date: 2022-03-25
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

The current patent for the registration of airborne laser bathymetric data is only "A Method for Stitching Airborne Laser Bathymetric Tracks Based on Monte Carlo Matching" (CN110375719A). question
However, the problem of scarce underwater registration features is not solved, and the quality of registration data still needs to be further improved.

Method used

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  • A registration method for airborne laser bathymetry data based on characteristic curves
  • A registration method for airborne laser bathymetry data based on characteristic curves
  • A registration method for airborne laser bathymetry data based on characteristic curves

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Embodiment

[0136] The present invention uses the data of the depth sounding test carried out on some islands in the South China Sea and their surrounding waters by using the Aquarius depth sounding laser scanner in January 2013 in cooperation with the Optech Company, the Ministry of Natural Resources. Aquarius is a shallow-water airborne laser sounding system launched by Optech based on Gemini in 2011. Its design has a maximum sounding depth of 15m. Using linear scanning, the scanning angle width is ±25°. The experiment areas of the method of the present invention are respectively recorded as island I and island II. The seabed topography in the surrounding sea area of ​​Island I has many ups and downs, and there is no obvious change pattern. The bottom material is mainly coral reefs. Said to be flatter, there is no obvious topographical undulation, the bottom is mainly sandy, and the features are rare. The underwater topography changes obviously with seasons and ocean currents, but the ...

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Abstract

The invention belongs to the technical field of marine surveying and mapping, and discloses a registration method for airborne laser sounding data based on a characteristic curve. The curve can more clearly describe the contour characteristics and trend change characteristics of the object to be registered. Estimate the degree of corresponding matching similarity; construct a curve deformation energy function that takes into account the degree of curvature of the curve, the spatial position and the overall similarity, and use the curvature difference of the homonymous points between the curves to be registered, the degree of spatial deviation, and the Spearman rank correlation coefficient of the angle between the curve vectors to form The curve deformation energy function can effectively measure the deformation between the curves; combined with the longest common subsequence algorithm and the curve deformation energy function to achieve the matching between the characteristic curves. The present invention uses characteristic curves such as contour lines representing seabed topography to register seabed point cloud data, which can effectively solve the problems of seabed point cloud data with few features, low point cloud density, large thickness, and difficulty in extracting features of the same name.

Description

technical field [0001] The invention belongs to the technical field of marine surveying and mapping, and in particular relates to an airborne laser sounding data registration method based on characteristic curves. Background technique [0002] At present, Airborne LiDAR Bathymetry (ALB) technology has the characteristics of wide operation coverage, high speed and high efficiency, and high safety. All-in-one fast measurement. Due to the joint influence of systematic errors and measurement random errors, the point cloud data acquired by adjacent airways has rotation and translation misalignment, resulting in three-dimensional spatial position offsets of points with the same name in the overlapping area of ​​adjacent airways, which directly affects the ALB data. the quality of. Therefore, it is necessary to register the point cloud data between adjacent navigation strips to provide quality assurance for underwater terrain measurement. Point cloud data registration is aimed a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V10/74G06K9/62G06T7/33
CPCG06T7/33G06T2207/10028G06F18/22
Inventor 徐文学张凡刘焱雄董志鹏唐秋华冯义楷李杰
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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