Automatic cross-platform geometric correction method for moon-based earth observation image
AssigneeInstitute of Remote Sensing and Digital Earth, Chinese Academy of Sciences
InventorsHuadong Guo, Lu Zhang, Guang Liu
Life of this patent
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Abstract
The disclosure analyzes moon-earth relationship and influencing factors for geometric distortion of a moon-based earth image, focuses on influences of position change of a sublunar point, a curvature of the earth, a terrain fluctuation on a large-scale hemisphere image, and the problem of small number of ground control points and uneven distribution thereof, and proposes a projection polar coordinate geometric expression method for the moon-based earth observation image, which takes into account of movement of the sublunar point, while considering multi-platform earth observation data, to realize accurate automatic geometric correction of the moon-based platform earth observation data.
Claims10
An automatic cross-platform geometric correction method for a moon-based earth observation image, comprising:
- a moon-based platform earth observation geometric parameter acquisition step, in which moon-based earth observation geometric parameters at an observation time are determined based on the rule of movement among the sun, the earth and the moon;
- a space-borne remote sensing image projection polar coordinate expression step, in which a space-borne remote sensing image having been geocoded is expressed in a projection polar coordinate system form related to a sublunar point according to the moon-based earth observation geometric parameters;
- a moon-based earth observation image simulation step, in which the space-borne remote sensing image expressed in the projection polar coordinate system form is converted into a moon-based platform earth simulation image by an interpolation method according to a requirement for geometric accuracy of the moon-based earth observation image, so as to form a base map database for the moon-based platform earth simulation image;
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- a moon-based platform earth observation and simulation image registration step, in which an observation image obtained by a moon-based platform is matched with a base map of the moon-based platform earth simulation image in the base map database for the moon-based platform earth simulation image corresponding to the observation time to complete the geometric correction of the moon-based earth observation image.
Dependencies are inferred from the claim text.