Method for storing vector data and indexing space

A technology of spatial indexing and vector data, which is used in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of reduced client-side visualization effect and increased network data transmission volume, so as to reduce network data transmission volume and improve effect of effect

Inactive Publication Date: 2010-06-30
BEIJING GUOXIN HUITONG SCI & TECH
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AI Technical Summary

Problems solved by technology

An unreasonable indexing mechanism not only brings more data storage capacity, but also increases the data transmission volume of the network, and the visualization effect of the client will also be reduced

Method used

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  • Method for storing vector data and indexing space
  • Method for storing vector data and indexing space
  • Method for storing vector data and indexing space

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Embodiment Construction

[0024] The present invention will be described in further detail below according to the embodiments and the accompanying drawings.

[0025] In order to be able to adapt to the needs of multiple applications for space vector data management, the present invention uses a relational database system (RDBMS) to store vector data, and space vector data is organized according to the form of point, line->point, polygon->point, text , figure 1 It is the logical model of the space vector data database designed by the present invention.

[0026] In this logical model, spatial vector data is organized in dataset tables in the form of thematic layers, and each thematic layer consists of a basic table (thematic basic table in the figure) and multiple tables for storing thematic objects according to the data type. The data table composition.

[0027] The theme basic table records the space vector data type of the theme and the information of the additional attribute fields of the theme, as...

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Abstract

The invention discloses a method for storing vector data and indexing a space of network browse transmission reduction, which is characterized in that: space vector data are organized in a data set table in a thematic layer form; each thematic layer consists of a thematic base table and a data table which is used for storing four kinds of thematic objects of a memory point type, a line type, a polygon type and a text type respectively according to data types; and depths and codes of quadtree indexes of each thematic object are recorded in the data table. The method comprises the following steps: browsing a space scope according to demands specified by a user; calculating the critical depth of a index; then extracting thematic objects of which tree depths are less than the critical depth in each thematic object of a database in sequence; and enabling the extracted thematic objects to well adapt to a visual scope of the user. The method can effectively reduce network data transmission quantity when the data are browsed according to the space index, easily improves the effect of data visualization, and is particularly effective for releasing and browsing maps of mobile equipment such as a mobile phone and the like.

Description

technical field [0001] The present invention relates to the fields of spatial data management and spatial information processing, in particular to establishing and storing spatial indexes for spatial vector data through a specific method, so that the spatial index-based spatial vector data can be quickly accessed. Background technique [0002] As an important spatial data type, vector data has been widely used in the field of spatial information. However, due to its large amount of data and complex topological relations, it has always been a subject of concern to people to access these spatial data quickly and efficiently. At present, with the rapid development of networking, more and more demands are required to access and even maintain space vector data in remote servers in real time through LAN, Web, wireless networks, etc. For example, as a typical application, city managers use mobile devices with data collection functions such as PDAs to collect variable data such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 黄学战张子民
Owner BEIJING GUOXIN HUITONG SCI & TECH
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