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A Downscaling Method of Surface Temperature Based on Temperature Change Rate

A technology of temperature change rate and surface temperature, applied in design optimization/simulation, instruments, complex mathematical operations, etc., can solve problems such as poor stability and complex algorithms, and achieve stable results

Active Publication Date: 2020-03-10
BEIJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the current surface temperature downscaling algorithm needs to rely on auxiliary data other than temperature, resulting in complex algorithm and poor stability

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  • A Downscaling Method of Surface Temperature Based on Temperature Change Rate
  • A Downscaling Method of Surface Temperature Based on Temperature Change Rate
  • A Downscaling Method of Surface Temperature Based on Temperature Change Rate

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] (1) Method description

[0052] 1.1 Rate of surface temperature change

[0053] The rate of change of surface temperature is defined similarly to the definition of slope in terrain, that is, how sharply the temperature changes in a particular direction. Similar to the temperature gradient in meteorology, it can be expressed as CRLST=ΔT / Δd. (1)

[0054] The slope of the surface temperature can be calculated by the above formula,

[0055] T slope = arc tan(CRLST) = arc tan(ΔT / Δd) (2)

[0056] In the formula, T slope is the slope of the surface temperature, ΔT is the temperature difference between two points in a surface temperature image, and Δd represents the distance between two points in a surface temperature image.

[0057] 1.2 Surface temperature downscaling

[0058] The surface temperature of a pixel can be described as the su...

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Abstract

The invention discloses a ground surface temperature downscaling algorithm based on a temperature change rate. A ground surface temperature image with high temporal and spatial resolution is obtained through static downscaling and dynamic downscaling. According to the method, a change law of ground surface temperature in space is explored in term of the temperature itself; at the same time, a temperature annual-cycle model is combined, the ground surface temperature of a long time sequence is combined into a downscaling model, and the ground surface temperature at any time is dynamically acquired; a used downscaling factor is a ground surface temperature gradient, change of the downscaling factor in a year is stable, and compared with downscaling factors of a NDVI, an albedo and the like, the downscaling factor is easier to be acquired; a factor with similar weather conditions can be used for replacement when temporal-consistent scale factors are deficient in the case of data absence, and impacts on a result are lesser; and an effect of the downscaling method is stable.

Description

technical field [0001] The invention relates to a method for downscaling the surface temperature based on the rate of temperature change. Background technique [0002] Surface temperature is an important parameter for estimating surface energy flux, and it is widely used in various disciplines. These applications include soil moisture estimation, forest fire monitoring, urban heat island effect monitoring, hydrological process research, and climate research, among others. [0003] Remote sensing images of land surface temperature with high temporal and spatial resolution are widely required in various fields. However, due to the shortcomings of remote sensing technology, it is difficult to obtain image data with high temporal resolution and high spatial resolution. [0004] The emergence of aerospace thermal infrared sensors makes it possible to obtain the surface temperature in a wide range. However, limited by the imaging conditions of thermal infrared sensors, it is st...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F17/18
CPCG16Z99/00
Inventor 陈云浩李京夏海萍
Owner BEIJING NORMAL UNIVERSITY
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