Automatic geometric correction method for cross-platform lunar-based Earth observation images

Abstract

This invention systematically analyzes the moon-earth relationship and the influencing factors of geometric distortion of moon-based remote sensing data, focusing on the geometric distortion of large-scale hemispheric images caused by the earth's curvature and elevation fluctuations, as well as the small number and uneven distribution of ground control points, etc., and utilizes many The platform's Earth observation data synergy and the advantages of moon-based projection polar coordinate expression realize the geometric correction of the moon-based platform's Earth observation data.

Description

technical field [0001] The invention relates to the field of earth observation, in particular to a method for automatic geometric correction of cross-platform moon-based earth observation images, in particular to an automatic geometric correction of cross-platform moon-based earth observation images based on sublunar point projection polar coordinate expression method. Background technique [0002] In order to realize the monitoring of macroscopic phenomena at the planetary scale and in a long-term continuous sequence, the research team led by Academician Guo Huadong proposed a new idea of ​​the moon-based platform for Earth observation. The moon is the only natural satellite of the earth. It has the characteristics of integrity and stability in observing the earth, and provides a more ideal observation platform for studying the macroscopic scientific phenomena of the earth. However, while the moon-based earth observation achieves the instantaneous acquisition of hemispheri...

AI Technical Summary

Problems solved by technology

However, while the moon-based Earth observation achieves instantaneous acquisition of hemispheric images, due to the influence of factors such as the ultra-long distance of 384,000 kilometers, special geometric observation conditions, sublunar point movement, and planetary scale, the observation of the moon-based platform Difficulties in accurate geometric correction of earth observation data are manifested in the problem of geometric deformation differences in different regions of the hemispheric-scale image caused by the curvature of the earth, the shift of the image center caused by the sublunar point, the change of the observed area caused by the movement of the morning and evening line, and the problem of The number of control points is scarce and unevenly distributed due to large-scale oceans, clouds, etc.

[0003] Geometric correction is to establish a mapping relationship between remote sensing image coordinates and corresponding ground point coordinates. Traditional geometric correction methods are suitable for geometric correction of local small areas, often ignoring the influence of the curvature of the earth on geometric distortion. There are limitations in the geometric correction of remote sensing images, so it is very necessary and significant to develop a geometric correction method suitable for lunar-based platforms to Earth observation images in view of the characteristics of lunar-based platforms

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