A water body topography extraction method

By enhancing the Urban Water Index (EUWI) model and using object-oriented image analysis methods, the problems of low automation and low accuracy in water body extraction in existing technologies have been solved, enabling efficient and accurate water body geomorphological extraction in complex terrain environments.

CN115223045BActive Publication Date: 2026-07-03SHANGHAI UBIQUITOUS NAVIGATION TECHNOLOGYCO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI UBIQUITOUS NAVIGATION TECHNOLOGYCO LTD
Filing Date
2022-07-15
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies neglect the influence of buildings and brightly colored features in water extraction, resulting in low automation and poor results, especially in complex terrain environments where the phenomenon of "different objects of the same spectrum" is serious.

Method used

The Enhanced Urban Water Index (EUWI) model was adopted, combined with high spatial resolution remote sensing image processing, and pixel reflectance values ​​were extracted through multiple spectral bands to construct an extraction model. Image segmentation was performed using object-oriented image analysis methods to suppress the 'salt and pepper' phenomenon and improve the accuracy of water body extraction.

Benefits of technology

It achieves better separation of buildings and bright-colored features in complex terrain environments, simplifies the water extraction process, improves the automation and accuracy of water extraction, reduces human intervention, and has strong practicality and scalability.

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Abstract

The present application relates to the technical field of remote sensing image processing, and particularly relates to a water body geomorphology extraction method, comprising the following steps: S1, obtaining remote sensing images for a target area and generating a pretreatment image; S2, extracting pixel reflectivity of a plurality of ground objects in each spectral band from the pretreatment image; S3, generating an extraction model according to all the ground object pixel reflectivity; and S4, generating an extraction image for labeling water body geomorphology by using the extraction model. The present application has the beneficial effect that the extraction model is set, the water body index model used in the prior art is optimized, so that water body and other easily confused ground objects such as shadows can be better separated in the process of extracting water body geomorphology, and the phenomenon of "pepper and salt" and other problems caused by extracting water body by threshold value only in the prior art is further avoided by using an object-oriented segmentation method, the process of water body extraction is simplified, and the water body extraction precision is improved.
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