An all-weather surface temperature generation method

Abstract

The invention relates to a surface temperature generation method, in particular to an all-weather surface temperature generation method having a spatial resolution of 1 km. The method of the inventionhas the advantages that the bottleneck of acquiring all-weather surface temperature under the spatial resolution of 1 km traditionally can be broken through; the passive microwave surface temperatureunder the spatial resolution of 1 km is acquired directly from the passive microwave brightness temperature by considering the correlation of temporal and spatial dimensional changes of surface temperature and brightness temperature; from the aspect of decomposing surface temperature-time components, three components of the surface temperature are formed by extracting from both thermal infrared and the passive microwave remote-sensing surface temperature, the components are effectively combined by means of the spatial correlation of the surface temperature, and the integrated all-weather surface temperature under the spatial resolution of 1 km is acquired accordingly. Compared with traditional experiential methods, the method of the invention has the advantages that the method is better in precision, popularization and transplantability, the traditional plaque effect integrated with surface temperature images can be maximally weakened, and image quality can be improved.

Description

technical field [0001] The invention relates to a method for generating surface temperature, in particular to an all-weather method for generating surface temperature with a spatial resolution of 1 km. Background technique [0002] Surface temperature is an important parameter for the study of global and regional climate change, especially all-weather surface temperature with a spatial resolution of 1 km has become an urgent need in related research and application fields. In the existing all-weather surface temperature generation method, the acquisition of passive microwave surface temperature with a spatial resolution of 1 km mainly includes two steps: 1) Obtain the inverted passive microwave surface temperature from the passive microwave brightness temperature at the original resolution; 2) ) at the original resolution, establish the functional relationship F between passive microwave surface temperature and temperature-related spatial factors (such as latitude and longit...

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Problems solved by technology

However, these methods have the following main problems: 1) In the process of improving the resolution of passive microwave surface temperature, the spatial factors related to surface temperature can only reflect the spatial variation of surface temperature, ignoring the time scale of surface temperature. At the same time, under the existing conditions, other 1km factors related to surface temperature (such as terrain roughness, slope, slope aspect, etc.) are difficult to obtain, and the surface temperature cannot be accurately calculated only through limited spatial factors. Quantitative description, so it is difficult to obtain the 1km passive microwave surface temperature that meets the accuracy requirements at 1km, and it shows a more obvious plaque effect in the integrated surface temperature image

2) Starting from the passive microwave brightness temperature, the process of obtaining the final 1km-resolution passive microwave surface temperature needs to go through two independent steps of "inversion" and "spatial resolution improvement". Due to the accumulation of errors, the accuracy of the final result will be affected. have a greater impact

The above problems will greatly affect the accuracy and corresponding image quality of passive microwave surface temperature with a spatial resolution of 1 km obtained by traditional methods

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