Method for constructing full-space three-dimensional digital earth model

Abstract

The invention discloses a method for constructing a full-space three-dimensional digital earth model. The method includes that an ellipsoid earth space mathematical model is constructed based on a center of gravity control system (CGCS) 2000 China geodetic coordinate system; an earth surface dissection network is generated based on a fictitious graticule; an earth surface digital elevation model is generated in an insertion mode; a geometric structure module of earth space inner and outer ring layers is fitted by interpolations; a three-dimensional body element mesh of the earth space inner and outer ring layers is generated based in geological cells; an attribute element three-dimensional distribution model of the earth space inner and outer ring layers is fitted by the interpolations; a geographical coordinate is converted into a geocentric space three-dimensional rectangular coordinate; an earth space model multi-scale expression mechanism based on level of detail (LOD) is constructed; three-dimensional visualization is performed; earth space positions are checked; and three-dimensional analysis is performed. According to the method, the automaticity and the adaptability are high, and an earth space solid model containing the inner and outer ring layers can be rapidly and automatically reconstructed in three-dimensional space to be displayed on a computer display screen in a three-dimensional visualization mode to support space analysis of various professionals.

Description

technical field [0001] The present invention relates to digital earth technology in the field of geospatial information technology, in particular to a method for constructing a full-space three-dimensional digital earth model. Various difficulties encountered in the reconstruction and analysis of the earth model. Background technique [0002] Since Al Gore, then the vice president of the United States, first proposed the concept of "Digital Earth" at the California Science Center and outlined its long-term goals in 1998, the basic theory and realization technology of Digital Earth have made important progress worldwide, and emerging A series of mature and powerful digital earth software systems have been produced, such as Google Earth, NASA World Wind, Microsoft Virtual Earth, ESRI ArcGIS Explorer, etc. As a model of the first generation of digital earth systems, these systems not only have the functions of browsing, querying, and discovering space objects and space phenome...

AI Technical Summary

Problems solved by technology

This geospatial expression is essentially a two-dimensional subdivision expression, which only stays on the earth's surface. It is mainly designed for the modeling, visualization and analysis of geospatial entities, and does not involve the atmospheric space above the earth's surface and below the earth's surface. It is difficult to apply to the modeling and analysis of three-dimensional entities in the inner and outer space of the earth, and it cannot meet the needs of aerospace, climate and meteorology, geology and mineral resources, large-scale engineering construction and other fields

[0005] (2) The 3D visualization and spatial analysis capabilities of the existing digital earth model are weak, and it is impossible to perform advanced stereoscopic display and professional 3D spatial analysis of real 3D earth space entities

The defects of the first-generation digital earth model have seriously restricted the effective expression and visual processing of three-dimensional earth spatial information, and also greatly restricted its in-depth application in many fields such as geology, geophysics, oceanography, and meteorology.

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