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Near-surface temperature inversion method based on FY-2C thermal-infrared waveband

A FY-2C, near-surface technology, applied in the field of near-surface air temperature inversion

Inactive Publication Date: 2013-11-20
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

However, so far, the product of using FY-2C to produce near-surface air temperature has not yet been released, and the method for retrieving near-surface air temperature for FY-2C is still in its infancy

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  • Near-surface temperature inversion method based on FY-2C thermal-infrared waveband
  • Near-surface temperature inversion method based on FY-2C thermal-infrared waveband
  • Near-surface temperature inversion method based on FY-2C thermal-infrared waveband

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Embodiment Construction

[0058] Figure 7 It is a schematic flow diagram of the method of the present invention.

[0059] The near-surface air temperature inversion method based on FY-2C thermal infrared band data and NCEP atmospheric profile data of the present invention comprises the following steps:

[0060] A. Atmospheric transmittance calculation

[0061] Atmospheric transmittance is calculated by combining MODTRAN simulation and statistical regression. The atmospheric transmittance of FY-2C in the thermal infrared band is simulated with the MODTRAN atmospheric correction model under the condition of known atmospheric profile. When simulating with MODTRAN, the temperature and humidity profiles are input, and the profiles are selected from the atmospheric profile at the same geographic latitude and longitude as the meteorological observation stations in the study area, and the rest of the parameters adopt default values. Finally, the quadratic function relationship with the observed zenith angl...

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Abstract

The invention relates o a near-surface temperature inversion method based on FY-2C thermal-infrared waveband data as well as NCEP (National Centers for Environmental Prediction) atmospheric profile data. The inversion method comprises the steps of A) calculating an atmospheric transmittance tau[i](theta), wherein the tau[i](theta) represents the atmospheric transmittance at the waveband i when the observation zenith angle is theta; B) respectively calculating land surface emissivity epsilon[IR1] and epsilon[IR2] of FY-2C at the wavebands IR1 and IR2; C) calculating a temperature change rate Rt(h) in different atmospheric layers, wherein Rt(h) is the reduced rate of temperature at the height h; D) calculating steam content proportion Rw(h) in different atmospheric layers, wherein the Rw(h) represents the percentage of steam in total water content at the layer whose height is h; and E) calculating the near-surface temperature Ta via the formula Ta=(B0+B1TIR1+B2TIR2-bT0) / a.

Description

technical field [0001] The invention relates to the field of thermal infrared inversion temperature remote sensing, in particular to a near-surface air temperature inversion method based on FY-2C thermal infrared band data and NCEP atmospheric profile data. Background technique [0002] The conventional means of obtaining the air temperature near the surface is to record it through meteorological observation stations. With the development of aerospace technology and remote sensing application technology, the use of remote sensing technology to retrieve near-surface air temperature is in its infancy. Although there are great difficulties, there are still researches on inversion of near-surface air temperature based on information in the thermal infrared band of remote sensing, and some research results have been achieved. Mainly divided into four categories: single factor statistical methods (Chen, E., L.Allen Jr, J.Bartholic, J.Gerber.Comparison of winter-nocturnal geostati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00
Inventor 陈云浩郭徵
Owner BEIJING NORMAL UNIVERSITY
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