Remote-sensing surface temperature downscaling algorithm

A surface temperature and downscaling technology, applied in radiation pyrometry, measuring devices, instruments, etc., can solve the problems that the nuclear drive method cannot downscale the temperature with low resolution, and the temperature cannot predict the temperature change information with low resolution, etc. achieve high spatial resolution

Active Publication Date: 2018-12-21
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the current method for improving the resolution of the surface temperature, the nuclear driving method cannot downscale the low-resol

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  • Remote-sensing surface temperature downscaling algorithm

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[0051] Table 1. Variable Description

[0052]

[0053] (1) Algorithm principle description

[0054] Such as figure 1 As shown, the algorithm of the present invention mainly consists of three steps: one is to obtain the high-resolution surface temperature through the kernel-driven algorithm, namely figure 1 (a) in (a); the second is to obtain medium-resolution surface temperature through the fusion algorithm, that is, figure 1 in (b); the third is to combine the results obtained in the first two steps to obtain the final high-resolution surface temperature, namely figure 1 (c) in.

[0055] 1.1 Kernel-driven downscaling process

[0056] The kernel-driven downscaling algorithm is based on the assumption of scale invariance, that is, the functional relationship between the regression kernel and the surface temperature is the same at different resolutions. Therefore, we can obtain the high-resolution surface temperature by obtaining the functional relationship between the l...

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Abstract

The invention discloses a remote-sensing surface temperature downscaling algorithm. The algorithm comprises the following steps: step one, implementing a nuclear driving algorithm to obtain a high-resolution surface temperature; step two, on the basis of an image fusion algorithm, acquiring a medium-resolution surface temperature; and step three, carrying out weighted combination on the high-resolution surface temperature obtained at the step one and the medium-resolution surface temperature obtained at the step two to obtain a high-resolution surface temperature. According to the remote-sensing surface temperature downscaling algorithm based on nuclear driving and image fusion, the surface temperature of a time sequence is processed by downscaling to obtain a high resolution. Because of the nuclear drive method, the spatial resolution of the auxiliary data is high; the image fusion method has the higher temporal prediction ability; and with utilization of advantages of the two kinds of methods, temperature downscaling is carried out by using the multi-source remote sensing data. Compared with the separate nuclear drive method, the remote-sensing surface temperature downscaling algorithm is suitable for the heterogeneous regions better; and compared with the separate fusion method, the remote-sensing surface temperature downscaling algorithm can obtain a multi-phase surface temperature with higher resolution.

Description

technical field [0001] The invention relates to a downscaling algorithm for remote sensing surface temperature. Background technique [0002] Land surface temperature (LST) is an important parameter in environmental research, it can be used to simulate radiative transfer and energy budget, retrieve surface carbon, monitor urban heat island, also be used for forest fire detection, and as an indicator of climate change, etc. [0003] Thermal infrared images obtained from satellite observations have fine spatial resolution or fine temporal resolution, which will be helpful for environmental research based on surface temperature. However, there is a limit between spatial and temporal resolution, i.e. sensors with high spatial resolution tend to have lower temporal resolution and vice versa. [0004] Existing approaches to improve the resolution of land surface temperature can be divided into two categories: the first is nuclear-driven methods that downscale land surface tempera...

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Application Information

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IPC IPC(8): G01J5/00
CPCG01J5/0066G01J5/007
Inventor 陈云浩夏海萍
Owner BEIJING NORMAL UNIVERSITY
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