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Implementation method of fast visualization of large-capacity vector map for embedded devices

An embedded device, vector map technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of memory expansion, time-consuming, etc., and achieve the effect of speeding up, speeding up, and improving ability

Active Publication Date: 2017-02-22
SOUTHEAST UNIV
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Problems solved by technology

However, this method has certain shortcomings. It takes time to create and maintain indexes, and this time increases with the increase of data volume. At the same time, the memory occupied by index files will also expand with the increase of data volume.

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  • Implementation method of fast visualization of large-capacity vector map for embedded devices
  • Implementation method of fast visualization of large-capacity vector map for embedded devices
  • Implementation method of fast visualization of large-capacity vector map for embedded devices

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Embodiment Construction

[0039]The present invention will be further described below in conjunction with the accompanying drawings.

[0040] Such as figure 1 As shown, a method for realizing fast visualization of large-capacity vector maps for embedded devices, the steps include:

[0041] (1) The PC end preprocesses the vector map: the PC end uses a series of comprehensive operations such as selection, merging, and simplification to perform multi-scale expression on the vector map; store the multi-scale expression results in the embedded sqlite database, and finally generate a Multi-scale spatial database file XX.db and an associated configuration file XX.zlw;

[0042] Described pretreatment process comprises:

[0043] (1.1) The PC side needs to obtain relevant parameters first: ①The denominator of the original scale of the vector map is S; ②The minimum visible target diameter D in the screen coordinate system; ③The geographical range of the vector map is Left, Right, Top, and Bottom; ④The mobile te...

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Abstract

The invention discloses an embedded-device-oriented method for achieving the rapid visualization of a high-capacity vector map. The method comprises the steps that firstly, a PC terminal preprocesses the vector map: multi-scale representation is carried out on the vector map, the multi-scale representation result is stored in an embedded type sqlite database, and finally a multi-scale space database file XX. db and an associated configuration file XX. zlw are generated; then, the database file XX. db and the associated configuration file XX. zlw are copied onto a PDA; finally, vector data are guided to the PDA terminal and displayed. The method ensures that in the process of simplifying any complex vector data, spatial relationship topology between the vector data themselves and the vector data is always kept consistent, the multi-scale representation of the vector data is achieved, the requirements of a user for browsing different-scale data under the different display proportional scales are met, the speed of data query access is quickened, the capability of real-time processing the vector map by an embedded device is improved, the speed of displaying the map on the embedded device is quickened, and the display content of a screen is clear and easily read.

Description

technical field [0001] The invention relates to the fields of geographic information system (GIS) technology, computer graphics, and map display processing methods, in particular to a method for realizing fast visualization of large-capacity vector maps oriented to embedded devices. Background technique [0002] The land management department of the land industry requires the processing and fast display of large-capacity vector maps on the mobile device PDA with limited resources. At present, the vector map data processing and display method based on PC is very mature. However, because embedded hardware devices cannot compare with PCs in terms of memory, storage capacity, computing power, and screen size, and the spatial data has the characteristics of high geometric complexity and large data volume, it is not possible to use the PC platform vector The map data processing and display methods are directly transplanted to the embedded platform. Most of the existing research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
Inventor 王慧青李玲王庆张小国潘树国
Owner SOUTHEAST UNIV
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