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A Diffuse Attenuation Coefficient Extraction Method for Airborne Lidar Bathymetry Data

A technology of attenuation coefficient and extraction method, applied in radio wave measurement system, measurement device, electromagnetic wave re-radiation and other directions, can solve the problems of low resolution and low precision, and achieve the effect of solving low precision and accurate inversion

Active Publication Date: 2022-03-04
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems existing in the prior art, the present invention proposes a method for extracting diffuse attenuation coefficients of airborne LiDAR sounding data, which is reasonably designed and solves the problems of low precision and low resolution in the process of extracting diffuse attenuation coefficients , to achieve accurate acquisition of the spatial distribution of diffuse attenuation coefficients in large-area waters

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  • A Diffuse Attenuation Coefficient Extraction Method for Airborne Lidar Bathymetry Data
  • A Diffuse Attenuation Coefficient Extraction Method for Airborne Lidar Bathymetry Data
  • A Diffuse Attenuation Coefficient Extraction Method for Airborne Lidar Bathymetry Data

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0051] The invention provides a method for extracting diffuse attenuation coefficients of airborne LiDAR sounding data, the process of which is as follows figure 1 shown. The echo waveform of the airborne LiDAR sounding system includes four parts: water surface reflection echo, water scattering echo, bottom reflection echo and noise, such as figure 2 shown. The extraction method of the diffuse attenuation coefficient specifically includes the following steps:

[0052] Step 1: Obtain the original airborne LiDAR sounding data, read the full waveform data in the sounding data, denoise the original waveform data of the airborne LiDAR sounding, and obtain the denoised waveform data.

[0053] Specifically, the original waveform data of airborne LiDAR sounding is used. Airborne LiDAR depth sounding technology has the advantages of high precision, ...

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Abstract

The invention discloses a method for extracting diffuse attenuation coefficients of airborne LiDAR sounding data, which belongs to the technical field of marine surveying and mapping. It first obtains the original wave data of airborne LiDAR sounding data, and denoises it; then uses a layered heterogeneous model Fit the denoised waveform data and decompose to obtain the water body scattering echo signal; then calculate the initial diffuse attenuation coefficient corresponding to the double-segment index through the water body scattering echo signal; finally determine the corresponding The weight is used to take the weighted average of the initial diffuse attenuation coefficient to obtain the final diffuse attenuation coefficient value of the laser sounding point. Through this method, the present invention realizes the extraction of the diffuse attenuation coefficient of each laser beam of the airborne LiDAR sounding data, and effectively solves the problems of low precision and low resolution of the current diffuse attenuation coefficient extraction.

Description

technical field [0001] The invention belongs to the technical field of marine surveying and mapping, and in particular relates to a method for extracting diffuse attenuation coefficients of airborne LiDAR sounding data. Background technique [0002] Diffuse attenuation coefficient is an inherent optical property of water body, which reflects the energy attenuation changes caused by laser scattering and absorption in water body, and is one of the important parameters for analyzing water quality. The diffuse attenuation coefficient mainly depends on the plankton content (chlorophyll concentration), suspended sediment content (turbidity), nutrient salt content (yellow matter, dissolved organic matter, salinity index) and other pollutants in the water body. The attenuation coefficient can realize real-time and effective monitoring of environmental changes such as water eutrophication, sudden increase of water turbidity, and water pollution, and play an important role in marine s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/08G01S7/48
CPCG01S17/08G01S7/4802G01S7/4808
Inventor 阳凡林亓超宿殿鹏王贤昆杨安秀石波张凯郭亚栋
Owner SHANDONG UNIV OF SCI & TECH
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