Method and device for performing three-dimensional rendering on large-scale DEM data, medium and program product

By converting DEM data into base raster data in the target geographic coordinate system and performing iterative resampling and tile-ization, the problems of memory overflow and low rendering efficiency of large-scale DEM data are solved, achieving efficient data access and rendering loading, and improving rendering performance and visualization effects.

CN121962380APending Publication Date: 2026-05-01SOUTH SURVEYING & MAPPING INSTR
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Patent Information

Application Number
CN202512040401.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing technologies suffer from problems such as memory overflow, insufficient storage space, low efficiency in multi-resolution visualization, and exponential growth in computation time as the amount of data increases when loading and visualizing large-scale DEM data, making it difficult to meet the needs of interactive browsing.

Method used

By converting DEM data into basic raster data under the target geographic coordinate system, iteratively resampling and dividing it into tile data, and calculating the index set and loading priority based on rendering parameters, intelligent and dynamic data loading and rendering are achieved.

Benefits of technology

It improves data storage and processing efficiency, optimizes rendering performance, ensures high-quality visualization, and meets the needs of high precision and fast response.

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Abstract

The invention discloses a method and device for three-dimensional rendering of large DEM data, a medium and a program product, and the method comprises the steps: obtaining original DEM data, converting the original DEM data based on a preset target geographic coordinate system, and obtaining basic raster data; performing iterative resampling on the basic raster data based on a preset down-sampling strategy until raster data generated by resampling meets a preset minimum tile resolution threshold, and obtaining a plurality of layers of raster data; dividing each layer of raster data based on a preset tile size to generate tile data; storing the tile data and the corresponding metadata into a preset database; obtaining a rendering parameter, and calculating an index set and a loading priority of the to-be-loaded tile based on the rendering parameter; matching tile data from a preset database based on the index set, and performing gridding processing on the tile data to generate a terrain geometric object; and rendering the terrain geometric object based on a preset scene to complete visual display.
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