The Research And Practice Of Key Technologies On Geographic Data Visualization Framework Of Web Front-end Based On Components

In the development of Web GIS technology,the visualization of geographic data as the means of spatial data analysis is very important for the geospatial data analysis in Web GIS.However,with the geo-data explosion and the increase of geospatial data analysis' s requirement,the traditional visualization method for geo-spatial data is limited by the facts that the functions of visualization service are scattered across the browser and the server,which results in that the functional coupling is too high,the code of service is generally not reusable and the transmission efficiency of the raster data visualization is very low because of adopting the image format.So it can not meet the needs of Web GIS visualization.This paper explores the integration technology for geographic data visualization service,fully exploits its needs and improves the visualization performance in the Web GIS,through regarding it as a whole system.So using it to better explore the relationship of the spatial distribution and the geographic data,which is of great significance.This research works includes:1.Analyze the existing geography data visualization technology and Web front end development process and explain the current trend of geographic data visualization.2.Based on the idea of open source Java Script GIS library and React componentization,design and implement a geographic data visualization framework of front-end.3.highlights the details of the key realization in this framework including the algorithm for smoothly converting the discrete data into RGB color through the way of single-color changes in the RGB model;dual-queue data structure to achieve the data lazy-loading module for raster data;the module asynchronous communication mode in this framework.4.Design and implement the Heihe River groundwater visualization platform based on this visualization framework.