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Mountain land surface temperature remote sensing inversion method

A surface temperature and remote sensing inversion technology, applied in the field of remote sensing, can solve the problems that the inversion of surface temperature in mountainous areas is not applicable, and there are few studies on complex terrain areas.

Active Publication Date: 2021-03-12
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

[0003] Existing surface temperature retrieval methods are mainly suitable for flat surfaces, and there are few studies on complex terrain areas
However, the complex geometric structure of mountain terrain changes the heat radiation transfer method between the surface and the atmosphere, which makes the land surface temperature inversion method based on the conventional heat radiation transfer equation not suitable for mountain surface temperature retrieval

Method used

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  • Mountain land surface temperature remote sensing inversion method
  • Mountain land surface temperature remote sensing inversion method
  • Mountain land surface temperature remote sensing inversion method

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Embodiment Construction

[0085] The present invention will be described in detail below in conjunction with specific embodiments.

[0086] Step 1: Data Preprocessing

[0087] Download the onboard radiance products of the TIRS (Thermal Infrared Sensor) sensor mounted on the Landsat 8 satellite, and the surface reflectance products of the OLI (Operational Land Imager) sensor. Data download URL: https: / / earthexplorer.usgs.gov / . Data preprocessing includes:

[0088] (5) Convert the count value in the on-satellite radiance product to on-satellite radiance:

[0089] L=gain×DN+offset (39)

[0090] In the formula, L is the radiance on the star; DN is the count value; gain and offset are the gain and offset. The gain and offset of the 10th channel of Landsat 8 are 0.00033420 and 0.1, respectively.

[0091] (6) Convert the count value in the surface reflectance product to surface reflectance:

[0092] ρ=a×DN+b (40)

[0093] In the formula, ρ is the surface reflectance, DN is the count value, and a and b ...

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Abstract

The invention discloses a mountain land surface temperature remote sensing inversion method, which comprises the following steps of 1, downloading an on-board radiance product of a TIRS sensor carriedon a Landsat 8 satellite and a surface reflectance product of an OLI sensor, and carrying out data preprocessing; 2, calculating the surface emissivity; 3, calculating topographic parameters; 4, calculating atmospheric parameters; wherein the atmospheric parameters comprise atmospheric transmissivity, atmospheric uplink radiation and atmospheric downlink radiation; 5, carrying out mountain land surface temperature inversion. Aiming at complex terrains of mountain lands, terrain parameters such as gradient, slope direction and sky visual factors are introduced into a thermal radiation transmission equation, and a mountainous region surface temperature inversion method is established, so that errors caused by inversion of the mountainous region surface temperature by utilizing a conventional thermal radiation transmission equation are effectively reduced, and the mountain land surface temperature inversion precision is improved.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a method for remote sensing inversion of mountain surface temperature. Background technique [0002] Surface temperature is a key factor describing the distribution of surface energy and the interaction between the surface and the atmosphere. It is also an important parameter for studying the dynamic balance of surface material energy. It is widely used in disaster assessment, evapotranspiration estimation, climate research, and soil moisture monitoring. Most of the current LST retrieval methods are aimed at flat ground, and few studies have been carried out on complex terrain areas. my country's five typical terrains include plains, mountains, plateaus, basins, and hills, of which plains account for only 12%. In complex terrain areas, the surface structure changes due to the undulation of the terrain, which causes the geometric relationship between the ground and the sen...

Claims

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Application Information

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IPC IPC(8): G06F17/11G06F17/13G06F17/15G06F17/18G01J5/00G01K11/12
CPCG06F17/11G06F17/13G06F17/15G06F17/18G01J5/007G01K11/125G01J5/804G01J5/802
Inventor 段四波朱晓琳李召良高懋芳冷佩
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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