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Method for inversing surface temperature and emissivity from MODIS data

A technology of surface temperature and emissivity, which is applied in the use of re-radiation, re-radiation of electromagnetic waves, measurement devices, etc., can solve the problems of difficult to meet the personal use of scientific researchers, complex surface temperature inversion methods, etc., to reduce calculation time, improve Inversion precision, high precision effect

Inactive Publication Date: 2010-02-24
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI +2
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for simultaneously retrieving surface temperature and emissivity from remote sensing data MODIS, to overcome the complexity of existing surface temperature inversion methods, and it is difficult to meet the needs of individual researchers, and to enrich domestic researchers. The product algorithm developed for thermal infrared remote sensors provides a reference for surface temperature and emissivity retrieval methods for thermal infrared sensors on 100 satellites that my country plans to launch before 2020, and can further improve the surface temperature and emissivity in the current Ministry of Agriculture's business operations Inversion accuracy, improve drought monitoring and crop yield estimation accuracy

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  • Method for inversing surface temperature and emissivity from MODIS data

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Embodiment Construction

[0048] The surface temperature inversion is based on the surface heat radiation conduction equation, that is, the surface temperature is retrieved by establishing an energy balance equation. The radiative transfer equation describes the total intensity of radiation observed by a satellite's microwave radiometer, not only from the surface, but also from the upward and downward paths of the atmosphere. These radiation components are also affected by the absorption of the atmosphere and reduced during the process of passing through the atmosphere to the remote sensor. At the same time, the radiation of the surface and the atmosphere also has a non-negligible influence in this process. The inversion formula of surface temperature can be simplified as shown in Equation 3:

[0049] B i (T i )=ε i (θ)τ i (θ)B i (T s )+[1-τ i (θ)][1+(1-ε i (θ))τ i (θ)] B i (T ia ) (Equation 3)

[0050] In formula 3: τ i (θ) represents the transmittance of the i-band (i is the 29th, 31st,...

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Abstract

A method for inversing surface temperature and emissivity from a remote sensing MODIS data comprises the steps of forward simulating by utilizing an atmospheric radiation transferring simulation software MODTRAN4 aiming at the atmospheric model, the region and the season of the 29th, 31st and 32nd thermal infrared bands of the received remote sensing MODIS data to create a training and testing database, retraining and retesting the training and testing database by using a neural network, back calculating an actual MODIS image data, verifying the actual ground surface and analyzing the application. The surface temperature and the emissivity received by the invention have the advantages of high precision, wide application range and simple operation.

Description

technical field [0001] The invention relates to a method for retrieving surface temperature and emissivity from remote sensing data MODIS, which can be applied to remote sensing departments such as meteorology, environmental monitoring, land management, agricultural monitoring, and national defense and military affairs. Background technique [0002] Surface temperature refers to the temperature of the surface layer of the earth, and surface emissivity is a very important index to measure the radiation ability of ground objects in the thermal infrared band. Surface temperature and emissivity are two very important parameters in the study of climate change. Their importance has made thermal infrared remote sensing an important field of remote sensing research. At present, many practical retrieval methods for surface temperature remote sensing have been developed, such as thermal Radiative transfer equation method, split window algorithm, single window algorithm and multi-chann...

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Application Information

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IPC IPC(8): G01S17/88G01S17/95G01S7/48G01S7/497G06N3/02
Inventor 毛克彪王道龙李滋睿王建明韩丽娟黄健熙
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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