Method for estimating surface temperature in zenith observation direction

Abstract

The invention relates to angle anisotropy of a large-width polar orbit satellite surface temperature product, and provides a new correction thought, which comprises the following steps of: firstly, establishing a function relationship between surface temperature observed in a zenith observation direction of a satellite and a plurality of characteristics, so that the zenith observation direction surface temperature corresponding to the zenith observation direction remote sensing surface temperature in the non-zenith observation direction is obtained, and the relation between the zenith observation direction remote sensing surface temperature in the non-zenith observation direction and the corresponding zenith observation direction surface temperature in the same pixel is ingeniously established; therefore, the angle correction of the remote sensing surface temperature in the zenith observation direction in the non-zenith observation direction is realized, so that a global scale satellite surface temperature product can be normalized to the zenith observation direction only through remote sensing satellite data. The method provided by the research is less in data input and obvious in innovativeness before practical operability.

Description

technical field [0001] The invention relates to the technical field of remote sensing surface temperature estimation and the field of machine learning, in particular to a method for estimating surface temperature in a zenith observation direction. Background technique [0002] Surface temperature is a key parameter in the process of regional-scale land surface systems, and it is widely used in many research fields such as surface energy balance, climate change, evapotranspiration, and resource and environment monitoring. Because it is easily affected by the surrounding environment (such as soil physical and chemical properties, albedo, vegetation, etc.), the surface temperature has strong spatial heterogeneity. Even if the same surface object is observed from different angles at the same time, the surface temperature There will also be differences in the observed values, and this difference can even be as high as 15°C. This problem is more obvious in the surface temperature...

AI Technical Summary

Problems solved by technology

This problem is more obvious in the surface temperature products of large-scale wide polar orbit satellites. However, these products do not consider the angle effect of surface temperature, and can only provide directional surface temperature at the observation angle of the satellite transit time

Obviously, the directional effect of the surface temperature will greatly reduce the practical application value of the surface temperature product

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