Precision evaluation method and system for remote sensing estimation of surface sensible heat/latent heat flux

A latent heat flux and accuracy evaluation technology, applied in the direction of measuring heat, calorimeters, measuring devices, etc., can solve problems such as inaccurate verification results and mismatching spatial representation ranges

Inactive Publication Date: 2015-03-11
CHONGQING SURVEY INST +2
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However, due to the mismatch between the two space representation r

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  • Precision evaluation method and system for remote sensing estimation of surface sensible heat/latent heat flux
  • Precision evaluation method and system for remote sensing estimation of surface sensible heat/latent heat flux
  • Precision evaluation method and system for remote sensing estimation of surface sensible heat/latent heat flux

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[0038] Ground-based observation instruments for sensible and latent heat fluxes at the surface are based on the principles of micrometeorology. The spatial range of surface fluxes observed by micrometeorological methods refers to the extent to which instrumental measurements can reflect the average or cumulative conditions of the actual surface, which can be characterized by footprints.

[0039] Footprint, also known as the source weight function, is a transfer function that describes the relationship between the spatial distribution of sources or sinks on the surface of the near-surface layer and the flux values ​​observed by instruments, reflecting the range of instrument observations, and can be analyzed quantitatively or qualitatively Relationship between instrumental observations and surface forcing terms. Among them, the area that has the main contribution to the flux observation value is called the flux contribution source area.

[0040] The present invention provides ...

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Abstract

The invention discloses a precision evaluation method and system for remote sensing estimation of surface sensible heat/latent heat flux. The method comprises the following steps: S1, observing the surface by a surface flux observation instrument to obtain reference surface sensible heat/latent heat flux data, and obtaining remote sensing surface sensible heat/latent heat flux data from a remote sensing product; S2, creating a Footprint model by data obtained by the surface flux observation instrument in the step S1, setting footprint grid resolution, working out the Footprint model to obtain a flux-source area for observing the surface sensible heat/latent heat flux, and performing normalization computing to obtain the flux contribution rate of each footprint grid; S3, performing weighted average calculation to obtain a remote sensing estimation value; S4, comparing the remote sensing estimation value with the actual measurement value of the ground. According to the method, the remote sensing product is subjected to precision evaluation by the observation value of a ground instrument, so that the precision and reliability of the remote sensing product can be guaranteed and the reliance of a user on the remote sensing product can be improved.

Description

technical field [0001] The invention relates to the technical field of verification of remote sensing products, in particular to a precision evaluation method and system for remote sensing estimation of surface sensible / latent heat flux. Background technique [0002] For surface sensible heat and latent heat flux, the remote sensing estimation results are arranged in pixels, and the size of each pixel is fixed. On the other hand, the flux values ​​observed by ground instruments, the size and position of the spatial range represented by them are not fixed, and are generally related to the height of the instrument, wind direction and speed, atmospheric stability, and the condition of the underlying surface, etc., and will continue to change over time. . Therefore, in the process of verification, there is a problem of mismatching of spatial representative ranges, and it is impossible to make one-to-one correspondence on the pixel scale. At present, for the verification of sur...

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Application Information

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IPC IPC(8): G01K19/00
Inventor 贾贞贞刘绍民向泽君梁建国徐自为胡开全徐同仁周智勇张俊前马红王快刘超祥柴洁黄磊王成
Owner CHONGQING SURVEY INST
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