A method for calculating a correction coefficient of elevation data based on gradient

By calculating the ratio drop value to obtain the correction coefficient, the problem of balancing accuracy and efficiency in hydrodynamic simulation using low-resolution DEM data is solved, thereby improving simulation accuracy and simplifying the calculation process.

CN117763987BActive Publication Date: 2026-07-03INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
Filing Date
2023-12-19
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

When using low-resolution DEM data in hydrodynamic simulation, existing technologies struggle to balance simulation accuracy and efficiency. While high-resolution DEM data offers detailed data, it requires extensive computation time and lacks effective methods for correcting elevation data.

Method used

By calculating the gradient of grid points corresponding to DEMs of different resolutions, correction coefficients are obtained and applied to the calculation of the bottom slope term in the two-dimensional hydrodynamic model to correct low-resolution DEM data and improve simulation accuracy and efficiency.

Benefits of technology

It achieves improved accuracy in two-dimensional hydrodynamic simulation while ensuring computational efficiency, and the calculation process is simple, easy to operate, and easy to promote.

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Abstract

The embodiment of the application discloses a kind of elevation data correction coefficient calculation methods based on gradient, belong to the technical field of hydrodynamic simulation, including the following steps: download and obtain the initial DEM data needing correction, then download the DEM data with higher resolution than initial DEM data;The gradient of the grid point corresponding to two different resolution DEMs is calculated;According to the gradient value calculated in step two, the correction coefficient is analyzed and calculated;The gradient of the grid point corresponding to two different resolution DEMs is calculated, i.e. The ratio of grid elevation difference and horizontal distance between grid center points;And according to the gradient value calculated by different resolution DEM, the correction coefficient is calculated, which is used in the calculation of bottom slope slope term in two-dimensional hydrodynamic model. The low-resolution DEM data is corrected by proposing the correction coefficient, which improves the accuracy and calculation efficiency of subsequent two-dimensional hydrodynamic simulation. The calculation process of the present application is simple, easy to operate and easy to promote.
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