Method for automatic geometric correction of cross-platform lunar-based earth observation image

Abstract

The invention systematically analyzes influence factors of the moon-earth relationship and the lunar-based remote sensing data geometric distortion, focuses on the large-scale hemispherical image geometric distortion caused by the curvature and the elevation fluctuation of the earth, the problem of few and uneven distribution of ground control points and the like, and realizes geometric correctionof the lunar-based platform earth observation data by taking the advantages of multi-platform earth observation data collaboration and lunar-based projection polar coordinate expression.

Description

technical field [0001] The present invention relates to the field of earth observation, in particular to a method for automatic geometric correction of cross-platform lunar-based earth observation images, in particular to an automatic geometric correction of cross-platform lunar-based earth observation images based on polar coordinate expression of sublunar point projection method. Background technique [0002] In order to realize the monitoring of planetary-scale and long-term continuous sequence of macroscopic phenomena on the earth, the research team headed by Academician Guo Huadong proposed a new idea of ​​earth observation on the moon-based platform. 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 instantaneous acquisitio...

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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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