Tile type large file organization storage method of three-dimensional model data

Abstract

The invention discloses a tile type large file organization storage method of three-dimensional model data. The method comprises the following steps: tiling the three-dimensional model data according to a global grid subdivision method; carrying out tightening and reconstruction on the original discrete tile data according to a calculation rule so as to form data block large files; arranging the divided data block large files from low to high according to resolution so as to form a tile pyramid ; defining disc organization structures and internal memory organization structures of the data block large files; decreasing the hierarchical division of the tile pyramid, and merging every two adjacent layers of data block large files of the tile pyramid into one layer according to a proportion of 1: 4; reconstructing the merged data block large files; re-mapping the vision field range of the hierarchy of the tile pyramid and storing the vision field range as a new data layer file; and when dividing one layer at each time, dynamically writing a file by utilizing an internal memory mapping technology, so as to write the tile pyramid into a disc layer by layer and then form large files of three-dimensional model data in which organizations are effectively stored in a tile manner.

Description

technical field [0001] The invention belongs to the technical field of geospatial information systems, and in particular relates to a tile-style large file storage organization method for three-dimensional model data. Background technique [0002] Three-dimensional GIS is an important development direction of GIS at present. It has been steadily developed under the traction of the increasing demand for three-dimensional spatial information and the vigorous development of modern emerging technologies. The construction and application of three-dimensional cities has become an inevitable trend in the development of geographic information technology, and it is also an important part of the construction of "digital cities". The storage organization of 3D model data is one of the most basic and key technologies, and its quality directly affects the development prospects of 3D technology applications. [0003] With the continuous improvement of computer performance and application...

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the current three-dimensional model data is difficult to achieve efficient storage and organization, and propose a tile-style large file storage organization method for three-dimensional model data. Taking into account the different file definition structures and different algorithms that have different effects on computer processing, the The tiled 3D model data is compressed and processed into a large data block file, and a tile pyramid is formed in the form of a large data block file

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