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An efficient display method and device for dynamic legends in a WebGIS environment

A display method and a display device technology, which are applied in the field of geographic information, can solve problems such as slow calculation speed, user interface legend refresh delay, poor user experience, etc., and achieve the effect of reducing read and write access and improving overall performance

Active Publication Date: 2018-12-11
吉奥时空信息技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a method and device for efficiently displaying dynamic legends in the WebGIS environment, aiming at solving the problem of easy calculation due to the large amount of data in the map range when using the existing technical solutions. The speed is slow, causing the legend refresh delay on the user interface, causing technical problems such as poor user experience

Method used

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  • An efficient display method and device for dynamic legends in a WebGIS environment
  • An efficient display method and device for dynamic legends in a WebGIS environment
  • An efficient display method and device for dynamic legends in a WebGIS environment

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Embodiment 1

[0036] Such as figure 1 As shown, the efficient display method of the dynamic legend under the WebGIS environment provided by the embodiment of the present invention comprises the following steps:

[0037] Step S1. Layer the entire map according to levels, and divide each layer into a grid, store the legend information in the grid to the current grid, and finally obtain the full grid data including the legend information.

[0038] At present, maps are hierarchical structures, and different levels correspond to different scales. The purpose of this step is to divide each layer into a grid and store legend information in the grid. Specifically, the specific implementation process of this step is as follows:

[0039] S11, the whole map is divided into pyramids of several levels according to the pattern of quadtree, each level of pyramid is a layer, and each level of pyramid is divided into several grids arranged horizontally and vertically, and each grid is passed through level, ...

Embodiment 2

[0066] Such as Figure 4 As shown, the present invention provides a kind of efficient display device of dynamic legend under WebGIS environment, for completing the efficient display method of dynamic legend under WebGIS environment provided by the present invention, the efficient display device of described dynamic legend under WebGIS environment comprises

[0067] Preprocessing unit: used to store the legend information into the grid data;

[0068] Legend real-time call unit: when the map range changes, it is used to obtain all grids that intersect with the current map range, and remove duplicate legend information in all grids;

[0069] Interface display unit: used to display the final legend information.

[0070] As a specific structure of the preprocessing unit, it includes:

[0071] The grid division module is used to divide the entire map into several levels of pyramids according to the quadtree mode. Each level of pyramid is a layer, and each level of pyramid is divid...

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Abstract

The invention is applicable to the field of geographic information technology and provides an efficient display method and device for dynamic legends in a WebGIS environment. The method comprises: layering an entire map according to a level, dividing a grid for each layer, storing legend information in the grid into a current grid, and finally obtaining full-grid data containing legend information; when the map range is changed, obtaining all grids intersecting with the current map range according to the current map range and level, and eliminating the duplicate legend information in all grids; displays the final legend information on the user interface. Through the above preprocessing process, all grids contain the symbolic information of each layer in the map, which effectively improvesthe performance of dynamic legend calculation in the case of too much data in the map, reduces the read-write access to the data itself, and improves the overall performance of the system.

Description

technical field [0001] The invention belongs to the technical field of geographic information, and in particular relates to a method and device for efficiently displaying dynamic legends in a WebGIS environment. Background technique [0002] In the geographic information system, the legend is an indispensable and important element in the system. It is used to describe the graphics displayed on the map in a centralized way, so that the viewer can easily understand the meaning of the graphic symbols. [0003] The number and style of legends are generally determined during the map making process. When calling the legend function in the system, all legends will be displayed directly. When there are many legends, the legend interface will appear messy and disorderly. In the existing technical solutions, someone has proposed a dynamic display method, according to the actual elements displayed in the current map field of view, real-time identification of the legends that need to be...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F9/451
CPCG06F9/451
Inventor 李论罗慕笔杨玲席胜吴昊
Owner 吉奥时空信息技术股份有限公司
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