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A method for estimating the diurnal range of surface temperature from msg2‑seviri data

A technology of MSG2-SEVIRI and surface temperature, applied in the field of remote sensing, can solve problems such as daily difference of surface temperature

Inactive Publication Date: 2017-05-10
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for estimating the daily difference of surface temperature from MSG2-SEVIRI data, which solves the problem in the prior art that the known surface temperature and specific emissivity are required to estimate the daily difference of surface temperature

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  • A method for estimating the diurnal range of surface temperature from msg2‑seviri data
  • A method for estimating the diurnal range of surface temperature from msg2‑seviri data
  • A method for estimating the diurnal range of surface temperature from msg2‑seviri data

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Embodiment Construction

[0060] The present invention will be described in detail below in combination with specific embodiments.

[0061] The invention provides a method for estimating the daily difference of surface temperature from MSG2-SEVIRI data, such as figure 1 shown, including the following steps:

[0062] Step 1: Obtain the MSG2-SEVIRI data of the study area, perform radiometric calibration on the MSG2-SEVIRI data, and convert the DN value into radiance; according to the Planck equation, convert the radiance into the brightness temperature on the star;

[0063] Perform radiometric calibration on MSG2-SEVIRI data, and convert the DN value obtained by MSG2-SEVIRI into radiance;

[0064] L=CAL_gain*DN+CAL_offset(1)

[0065] In the formula, L is the on-board radiance measured by MSG2-SEVIRI, DN is the count value, CAL_gain and CAL_offset are radiation calibration coefficients, for the 9th channel of MSG2-SEVIRI: CAL_gain=0.205034, CAL_offset=-10.4568; for the 10th channel : CAL_gain=0.222311,...

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Abstract

The invention discloses a method for estimating ground surface temperature daily range based on MSG2-SEVIRI data. The method comprises the following steps: obtaining the MSG2-SEVIRI data of a research region, carrying out radiometric calibration on the MSG2-SEVIRI data, and converting DN values into radiance; converting the radiance into on-satellite brightness temperature according to a Planck equation; calculating ground surface temperature difference at any two moments by utilizing a surface temperature split-window algorithm; coupling a ground surface temperature diurnal variation model and the split-window algorithm, and through a least squares fitting method, calculating parameters of the ground surface temperature diurnal variation model; and calculating ground surface temperature daily range according to the parameters of the ground surface temperature diurnal variation model obtained in the step 3. The method is to estimate the ground surface temperature daily range based on the stationary satellite data by fully utilizing the characteristics of stationary satellite data high time resolution, by coupling the split-window algorithm with the ground surface temperature diurnal variation model, and under the condition of not needing inversion of the surface temperature and emissivity.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, and in particular relates to a method for estimating the daily difference of surface temperature from MSG2-SEVIRI data. Background technique [0002] The daily range of surface temperature, also known as the daily amplitude of surface temperature, is the difference between the highest value and the lowest value of surface temperature in a day. Its size is related to latitude, season, surface properties and weather conditions. The diurnal range of surface temperature is of great significance in the research of climate change and agricultural monitoring. The traditional measurement of the diurnal range of surface temperature is obtained through ground observations. Conventional ground measurements can only represent point-scale data, and it is difficult to obtain regional-scale data, while satellite remote sensing is the only means to obtain regional-scale daily range of surface temperatur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/10G01W1/02
Inventor 段四波李召良冷佩
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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