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A Fast Simulation Method for Earth Observation Radiation Images Under Different Aerosol Parameter Conditions

A technology of earth observation and radiation images, applied in the field of simulation of earth observation radiation images, can solve the problems that the influence of received radiation intensity has not been considered, and the characteristics of aerosol spatial distribution cannot be reflected, and achieve fast simulation speed and simulation calculation speed Improve the effect of good versatility

Active Publication Date: 2018-11-06
BEIHANG UNIV
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Problems solved by technology

Moreover, the scheme has not considered the influence of surface height and aerosol meteorological range on the radiation intensity received by the sensor, and the texture of the simulated image (radiation intensity changes) cannot reflect the spatial distribution characteristics of aerosols

Method used

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  • A Fast Simulation Method for Earth Observation Radiation Images Under Different Aerosol Parameter Conditions
  • A Fast Simulation Method for Earth Observation Radiation Images Under Different Aerosol Parameter Conditions
  • A Fast Simulation Method for Earth Observation Radiation Images Under Different Aerosol Parameter Conditions

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Embodiment

[0129] The present invention will be further described below by taking the simulated MODIS measured image as an example. The target scene is the detection area of ​​Aqua-MODIS from 5:30a.m to 5:35a.m on January 19, 2015.

[0130] Step 1: quickly calculate the spectral extinction coefficient and spectral scattering coefficient of the aerosol by using the proportional relationship in formula (19).

[0131] Figure 5 Shown is a rural aerosol with a relative humidity of 0.7, under the condition of a meteorological visual range of 2 km, the approximate calculation of the spectral extinction coefficient under the conditions of a meteorological visual range of 10 km, 21 km and 50 km, and the results in the MODIS band 3 (0.459-0.479 μm) Compare chart. The dotted line in the figure is the accurate calculation result of the Mie scattering calculation method, and the dotted line is the approximate calculation result of formula (19).

[0132] Depend on Figure 5 It can be seen that th...

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Abstract

The invention discloses a quick simulation method for an earth observation radiation image on condition of different aerosol parameters. The quick simulation method comprises the steps of a first step, selecting a standard aerosol profile parameter; a second step, inverting an aerosol parameter of each pixel unit in a scene according to a table look-up method; a third step, searching true surface elevation information which corresponds with each pixel; a fourth step, calculating an equivalent surface height of an extinction coefficient of each pixel; a fifth step, solving a radiation transmission equation by means of a secondary approximation method, thereby obtaining a radiation matrix of each radiation kind; a sixth step, obtaining spectral characteristic information of each pixel; and a seventh step, simulating the earth observation radiation image by means of a radiation matrix interpolation method. The quick simulation method has high image simulation speed, and compared with a traditional method, the simulation calculating speed can be improved by 10-20 times on a same platform. The quick simulation method has high universality and is not limited by an aerosol parameter setting method in a scene. The quick simulation method is suitable for simulating the observed image of a real orbital sensor and is also suitable for simulating an infrared radiation image in an assumed observation scene.

Description

technical field [0001] The invention relates to the technical field of simulation of earth observation radiation images, in particular to a fast simulation method of earth observation radiation images under the condition of different aerosol parameters. Background technique [0002] In the Earth's atmosphere, in addition to containing nitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), argon (Ar) and other gas components, it also contains suspended dust, liquid droplets, ice crystals and other solid or liquid particles, these particles are collectively called aerosols (see literature [1] Zhang Jianqi, Fang Xiaoping. Infrared Physics [M] . Xi'an: Xidian University Press. 2004.6.). Affected by the scattering and absorption of various gases and aerosols, infrared radiation will be attenuated when transmitted in the atmosphere. On the other hand, through theoretical calculation and simulation of earth observation radiation images, and comparing them with the actual remot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
CPCG01J5/007G01J2005/0077
Inventor 何晓雨许小剑
Owner BEIHANG UNIV
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