Discrete forest scene thermal infrared radiation transmission simulation method
A simulation method and radiation transfer technology, which is applied in the field of thermal infrared radiation transfer simulation in discrete forest scenes, can solve problems such as not considering the vertical heterogeneity of forest canopy structure
Active Publication Date: 2021-01-22
AEROSPACE INFORMATION RES INST CAS
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However, in the thermal infrared band for retrieving surface temperature, there is no relevant model that considers the vertical heterogeneity of canopy structure and temperature.
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[0075] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0076] In order to solve the deficiencies in the above technical problems, the present invention is based on the existing radiative transfer model theory, organically combines the theory of discrete grid and spectrum invariance, and proposes a thermal infrared radiative transfer simulation that can be used in discrete forest scenes method.
[0077] Such as figure 1 A method for simulating thermal infrared radiation transfer in a discrete forest scene includes the following steps:
[0078] S1. Considering the three-dimensional structure of the forest, the entire forest scene is divided into four layers according to the category and temperature difference, including the upper tree canopy, middle tree trunk, understory vegetation and bottom soil from top to bottom; through direct radiation simulation and multiple scattering simulation ...
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The invention discloses a discrete forest scene thermal infrared radiation transmission simulation method, which comprises the following steps of: S1, considering a three-dimensional structure of a forest, dividing a whole forest scene into four layers according to category and temperature difference, i.e. sequentially an upper-layer crown, a middle-layer trunk, under-forest vegetation and bottom-layer soil from top to bottom; S2, dispersing components of each layer, and dividing the components into different grids or sub-layers according to a geometric structure; S3, conducting direct radiation simulation: calculating the visual proportion of illumination and shadow of each layer of components according to the leaf area density in the grid, and calculating the direct emission items of thecomponents through a Planck function; S4, performing multiple scattering simulation: calculating multiple scattering items among the components according to a spectrum invariant theory; and S5, acquiring that a canopy top emission item is equal to the sum of a direct emission item and the multiple scattering items. By establishing the relationship between canopy top heat radiation and the temperature state of each component in the canopy, the applicability is wide, and the simulation precision is high.
Description
technical field [0001] The invention relates to a novel thermal infrared radiation transfer simulation method, in particular to a thermal infrared radiation transfer simulation method for a discrete forest scene. Background technique [0002] Land surface temperature (LST) is an important indicator for forest vegetation growth evaluation, drought and fire monitoring, and an important input parameter for the energy balance and water cycle process of the earth's surface. By means of remote sensing, large-scale land surface temperature information can be obtained. The surface temperature retrieved from satellite thermal infrared observation data is usually the result of the joint action of different components inside the pixel. Therefore, the average pixel temperature cannot directly reflect the temperature distribution inside the forest, but the effects of different components need to be taken into account. Due to the heterogeneity of the physical properties of the component...
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Login to View More IPC IPC(8): G01J5/00
CPCG01J5/007G01J5/0066G01J2005/0077
Inventor 卞尊健杜永明历华曹彪肖青柳钦火
Owner AEROSPACE INFORMATION RES INST CAS