Urban dense grassland radiation direction characteristic simulation method

A technology of radiation direction and simulation method, which is applied in the field of remote sensing and can solve the problem of not considering the internal radiation characteristics of plants.

Inactive Publication Date: 2016-08-24
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0006] Most of the above porosity models are based on the idea of ​​geometric optics to directly derive the calculation method of porosity in discrete vegetation, and model the entire plant, such as: cylinders, triangular pyramids, cuboids and other three-dimensional objects, without considering the internal radiation characteristics of plants

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  • Urban dense grassland radiation direction characteristic simulation method
  • Urban dense grassland radiation direction characteristic simulation method
  • Urban dense grassland radiation direction characteristic simulation method

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Embodiment Construction

[0018] Compared with winter wheat and forest, urban grassland vegetation has its particularity: (1) The plant species are relatively single, and the plants grow densely and neatly, which means that the mutual overlap and mutual shading between plant canopies cannot be ignored. (2) The spatial heterogeneity of the grassland is low. It can be assumed that the vegetation types in the same pixel are the same. The grassland vegetation is a discontinuous canopy with plants and plant pores, and the plants are randomly distributed in space.

[0019] Therefore, aiming at the particularity of urban grassland vegetation, the radiation directionality of urban grassland is simulated.

[0020] Step 1) The method for calculating the average projected area and the overlapping index of any triangular blade projected overlapping area is specifically: the grass blade is simulated as an isosceles triangular blade, such as figure 2 The schematic display of .

[0021] Obtain the average projected...

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Abstract

The invention discloses an urban dense grassland radiation direction characteristic simulation method. The method particularly comprises the steps that 1, a projection overlap function and an equivalent projection area of a triangular lamina in any tendency are constructed; 2, respective area proportions of four components of light illumination soil K<g>, shadow soil K<z>, light illumination lamina K<c> and shadow lamina K<l> are calculated on the ideal condition that the average porosity in the sun direction and the average porosity in the observation direction are mutually independent; 3, the ideal condition is corrected to the practical condition, and four component proportion calculation is conducted on the condition that the average porosity in the sun direction and the average porosity in the observation direction are not mutually independent; 4, a vegetation canopy reflectance primary scattering item is obtained; 5, the grassland canopy reflectance is obtained. The urban dense grassland radiation direction characteristic simulation method is compared with field experimental data verification, the method can describe a hot spot effect and bowl edge effect of grassland vegetation radiation directionality, and meanwhile the method can reflect a change tendency of the grassland vegetation radition directionality.

Description

technical field [0001] The invention relates to the field of remote sensing, in particular to a method for simulating radiation direction characteristics of urban dense grassland. Background technique [0002] Vegetation canopy porosity can be expressed as the probability that light is not blocked by leaves and stems when passing through the vegetation canopy, and it is an important parameter to describe the spatial distribution of canopy structure and leaf density. Porosity is widely used in remote sensing applications such as vegetation canopy energy balance estimation, water stress, and multi-angle information extraction. The calculation of canopy isotropic porosity is widely used in the research of PAR, canopy BRDF and canopy thermal radiation directionality. In the process of crop growth, when the leaf area index is relatively small, if the porosity is not considered, it will cause a large error. [0003] Many famous scholars have conducted research on canopy porosity...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/17G01N2021/1793
Inventor 顾行发余涛孙源谢勇韩杰刘其悦高海亮王春梅方莉
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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