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Plant canopy three-dimensional radiation transmission analog method based on Lidar data

A technology of radiation transfer and vegetation canopy, applied in the field of remote sensing, can solve the problems of complex parameterization process and limitations of the model, and achieve the effect of improving memory utilization efficiency, simple algorithm, and good practicability

Active Publication Date: 2018-06-22
SUN YAT SEN UNIV
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Problems solved by technology

However, these simplistic assumptions are likely to be inconsistent with the real situation, and the parameterization process of the model is also relatively complicated, so it has great limitations in practical applications

Method used

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  • Plant canopy three-dimensional radiation transmission analog method based on Lidar data
  • Plant canopy three-dimensional radiation transmission analog method based on Lidar data
  • Plant canopy three-dimensional radiation transmission analog method based on Lidar data

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Embodiment 1

[0036] like Figure 5 As shown, the method provided by the invention specifically includes the following steps:

[0037] (1) Scene construction

[0038] The input data of the method is preprocessed high-precision, high-density Lidar data. Lidar data preprocessing steps include: filtering process, which divides Lidar data into ground points and non-ground points; spatial interpolation is performed on ground points to generate a surface elevation model (digital elevation model, DEM), which is used to describe the terrain; for non-ground points, The Lidar data of each tree is extracted separately using the single-tree segmentation algorithm; on the basis of the single-tree segmentation, the branch-leaf separation algorithm is used to further divide the Lidar data of each tree into leaves and branches. There are already mature algorithms and software tools for Lidar data preprocessing, which will not be described in detail here. After the Lidar data is preprocessed by classific...

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Abstract

The invention provides a plant canopy three-dimensional radiation transmission analog method based on Lidar data (laser radar data), comprising the steps of S1, acquiring Lidar data to preprocess thesame, performing octree-based voxel processing on the preprocessed Lidar data, and reconstructing forest three-dimensional structure, wherein voxel to reconstruct the forest three-dimensional structure is centimeter-level high-resolution voxel; S2, customizing camera parameters and light conditions by a user, and estimating radiation brightness value of each pixel reaching the camera via a radiation transmission equation; S3, simulating an imaging process through the step S2, and further calculating a radiation flux and a bidirectional reflectivity factor.

Description

technical field [0001] The invention relates to the technical field of remote sensing, and more particularly, to a method for simulating three-dimensional radiation transfer of vegetation canopies based on Lidar data. Background technique [0002] Three-dimensional radiative transfer simulation of vegetation canopy is an important research field in remote sensing technology. This technique can simulate the transport process of solar radiation in the vegetation canopy and contribute to a better understanding of biophysical processes in terrestrial ecosystems, including the exchange of energy, carbon and water between the biosphere and the atmosphere; in addition, The research on radiative transfer simulation of vegetation canopy is the theoretical basis for understanding remote sensing observation signals and quantitative inversion of surface parameters, and helps to extract surface information from remote sensing data more effectively for solving related scientific problems....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01N21/17
CPCG01N21/17G01N2021/1785G01N2021/1797G01S17/89
Inventor 李文楷
Owner SUN YAT SEN UNIV
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