Geometric processing method, device and equipment for satellite data across positive and negative 180 degrees of longitude

By correcting the initial longitude range of satellite data and stitching together elevation data, a rational polynomial function model was established, which solved the geometric correction problem when the longitude spans ±180 degrees, thus improving the geometric processing quality of satellite data.

CN120563318BActive Publication Date: 2025-11-04AEROSPACE INFORMATION RES INST CAS
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Patent Information

Application Number
CN202511061853.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-31
Publication Date
2025-11-04
Estimated Expiration
2045-07-31

AI Technical Summary

Technical Problem

Existing technologies, when processing satellite data spanning a longitude range of plus or minus 180 degrees, cause geometric models to fail to converge, resulting in problems such as distorted and misaligned geometrically corrected images and lost data in the product.

Method used

By correcting the initial longitude range, the longitude range is mapped to a continuous space, eliminating coordinate jumps at the positive and negative 180-degree boundaries. The elevation data of the corrected longitude range is then spliced ​​across 180-degree meridians to establish a rational polynomial function model, generating a geometrically corrected product.

Benefits of technology

The geometric model of satellite data is made mathematically differentiable and convergent, preserving terrain details, eliminating elevation data gaps, and improving coordinate accuracy and data integrity.

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Abstract

The present application provides a kind of longitude cross positive and negative 180 degrees satellite data geometric processing method, device and equipment, it is related to satellite data processing technical field.The geometric processing method includes: obtaining the initial longitude range corresponding to satellite data, in the case where initial longitude range crosses positive and negative 180 degrees, initial longitude range is corrected, and the modified longitude range is obtained;The elevation data corresponding to the modified longitude range is spliced across 180 degrees meridian, and the spliced elevation data is obtained;Based on the space grid of spliced elevation data, the grid point longitude value of space grid is corrected, and the rational polynomial function model is established according to the grid point longitude value after modification;Based on rational polynomial function model and spliced elevation data, generate the product after geometric correction.
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