Method capable of progressively transmitting for storing and accessing aggregated vector data

Abstract

The invention discloses a method capable of progressively transmitting for storing and accessing aggregated vector data, wherein vector data can be taken as a sequence point set; the sequence point set is used as a basis; the vector data are decomposed into initial data and a series of variable sets; and a formalization model capable of progressively transmitting for storing and accessing aggregated vector data is formed. In the method disclosed by the invention, a vector data aggregation relation model storage scheme is designed under a progressive transmission model; the progressive increment data belonging to one aggregation are stored into a record according to an accuracy level and a mark sequence; the record number of geometric data tables is compressed; and multiple geometric objects are simultaneously stored in one record, thereby enhancing the reading / writing speed of a magnetic disk. Finally, the client cache of the vector data aggregations under the progressive transmissionmodel and hierarchical scheduling strategies based on a visual range are analyzed.

Description

technical field [0001] The invention discloses a method for aggregated storage and access of vector data that can be used for progressive transmission, which can realize efficient storage and access of vector data in the field of geographic information systems. Background technique [0002] Spatial data has massive characteristics, and the application of various modern data collection methods makes the amount of available spatial data increase rapidly. In the foreseeable future, the contradiction between computer processing power and unlimited spatial data will always exist. In order to improve the response speed of the system, it is always the core topic in the field of GIS research to find technologies and methods to optimize performance in the links of organization, transmission and visualization of spatial data. [0003] The vector data of GIS undertakes the dual tasks of spatial analysis and cartographic output. The classic research on vector data progressive transmissi...

AI Technical Summary

Problems solved by technology

[0003] The vector data of GIS undertakes the dual tasks of spatial analysis and cartographic output. The classic research on vector data progressive transmission believes that it is the reverse process of cartographic synthesis, and the cartographic synthesis technology itself is not yet mature. Therefore, the efficient transmission of vector data is based on geometric It is difficult to achieve consistency and balance among goals such as simplicity, data organization, and topology relationship maintenance

The existing research work is focused on the improvement of geometric data simplification algorithm and the gradual transmission experiment of specific applications. There is no complete solution, and it cannot be effectively integrated with the mainstream GIS software architecture.

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