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Estimation methods of optical remote sensing image land surface temperature under cloud and emission long wave radiation

An optical remote sensing image, surface temperature technology, applied in the direction of physical/chemical changes in thermometers, thermometers, image enhancement, etc., can solve problems such as inability to determine surface temperature, and achieve the effect of achieving surface temperature and recovery

Active Publication Date: 2015-09-09
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for estimating the ground surface temperature under the cloud of an optical remote sensing image and the emission of long-wave radiation, so as to solve the problem in the prior art that the ground surface temperature under cloudy conditions cannot be determined from the optical remote sensing image

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  • Estimation methods of optical remote sensing image land surface temperature under cloud and emission long wave radiation
  • Estimation methods of optical remote sensing image land surface temperature under cloud and emission long wave radiation
  • Estimation methods of optical remote sensing image land surface temperature under cloud and emission long wave radiation

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Embodiment 1

[0021] Embodiment 1 of the present invention provides a method for estimating the surface temperature under the cloud of an optical remote sensing image, see figure 1 , the method may include the following steps:

[0022] Step S102: Determine the specific range of shadows cast by all clouds on the optical remote sensing image to be processed.

[0023] Among them, when implementing this step, first use the corresponding relationship between the cloud layer and the shadow cast by the cloud layer on the optical remote sensing image to be processed, combine the satellite observation angle and the sun angle to determine the height of the cloud layer, and then determine the height of the cloud layer according to the height of the cloud layer and the optical remote sensing image to be processed , determine the specific range of shadows cast by all clouds on the optical remote sensing image to be processed, and the specific range includes pure shadow areas, non-shadowed areas covered ...

Embodiment 2

[0037] This embodiment is a further preferred method for estimating the surface temperature under the cloud of optical remote sensing images on the basis of Embodiment 1, see figure 2 , the method is specifically described as follows:

[0038] (1) Utilize the corresponding relationship between the cloud layer and its cast shadow on the image to be processed, and combine the satellite observation angle and the sun angle to determine the height of the cloud layer. Specifically: the distance between clouds and shadows can be directly obtained on the image, and the angle between the satellite and the sun can also be obtained directly in the auxiliary file of the satellite image. According to trigonometric functions, the given length and angle can be obtained by using the sine or cosine function high.

[0039](2) According to the cloud height and the observation angle of the sun and satellite, determine the specific range of shadows cast by all clouds on the image, specifically: ...

Embodiment 3

[0049] Embodiment 3 of the present invention provides a method for estimating the long-wave radiation emitted by the ground surface under the cloud of an optical remote sensing image, see image 3 , the method may include the following steps:

[0050] Step S302: the surface temperature under the cloud of the optical remote sensing image.

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Abstract

The present invention discloses estimation methods of optical remote sensing image land surface temperature under cloud and emission long wave radiation. The estimation methods of optical remote sensing image land surface temperature under cloud comprises a step of determining the specific scope of all cloud layer cast shadows on an optical remote sensing image to be processed and obtaining the land surface temperature of a pure shadow area through image retrieval, a step of selecting a clear sky image with the interval of a preset time with the image to be processed as an intermediary image for a cloud layer coverage non-shadow area, determining one reference area on the optical remote sensing image to be processed, and obtaining the land surface temperature of the cloud layer coverage non-shadow area according to the temperature of the reference area, a step of determining a search area in the optical remote sensing image to be processed for the cloud layer coverage non-shadow area, and a step of obtaining the land surface temperature of a cloud layer coverage shadow area according to the land surface of the pure shadow area in the search area so as to realize the estimation of the land surface temperature in the condition of a cloud layer. Through the estimation methods, the estimation of the land surface temperature in the condition of the cloud layer can be realized.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a method for estimating the ground surface temperature under clouds and emitted long-wave radiation in optical remote sensing images. Background technique [0002] The use of optical remote sensing images to obtain land surface temperature is one of the key areas of remote sensing applications. The remote sensing retrieval of land surface temperature mainly relies on thermal infrared bands. However, it is difficult for thermal infrared bands to penetrate clouds. Under clear sky conditions, the surface temperature under cloudy conditions cannot be directly obtained from optical remote sensing images, resulting in discontinuous spatial distribution of temperature products retrieved by remote sensing, which is difficult to apply, for example, it is difficult to be adopted by models that study global change and it is difficult to accurately describe the surface temper...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T7/00G01K11/30
CPCG06T7/0002G01K11/30G06T2207/10032G06T2207/30181G06V20/194G06V20/13
Inventor 王天星施建成阎广建
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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