Visualizaion System Of Spatio-temporal Evolution Of Internet Public Opinion Based On Geographic Space

With the rapid development of Internet technology,online media has become the main channel of information dissemination,and its influence on the direction of social public opinion has become increasingly significant.While online media brings convenience,it is also becoming a breeding ground for false information.Therefore,it is of great practical significance to analyze and monitor online public opinion.At present,all major domestic online public opinion systems can realize the collection and content analysis of online public opinion data,but mainly focus on the analysis and visualization of the relationship between public opinion text content and network virtual space,and consider the relevance analysis of public opinion dissemination and real geospatial information Insufficient,a visualization system that combines geospatial analysis of the temporal and spatial evolution of network public opinion is the development trend of public opinion analysis information systems.Therefore,this article takes microblog-based online public opinion events as the research object,and conducts research around the collection,analysis and visualization of public opinion data,and designs and implements a geospatial-based visualization system for the temporal and spatial evolution of online public opinion to analyze public opinion information in geographic space.The evolution of time and space.Based on the perspective of building a network public opinion visualization system based on geographic space to visualize the temporal and spatial evolution of public opinion data,this paper studies the key technologies involved in the visualization of temporal and spatial evolution of public opinion,and makes technical selection based on the specific needs of the system.Based on the analysis of system requirements,the system outline design is carried out from the three aspects of system function modules,data storage structure and technical architecture.The technical realization process of the main functions of the visualization of the temporal and spatial evolution of public opinion is expounded,and the visualization prototype system of the temporal and spatial evolution of the network public opinion based on geographic space is realized.Combined with application cases,it tested and demonstrated the visualization function of the temporal and spatial evolution of public opinion based on geographic space.This system is built with a B/S structure,and its main functions include server-side functions and client-side functions.Server-side functions include data collection,data preprocessing and data analysis.The data collection module is built based on Python's Scrapy framework,and uses the relational database PostgreSQL to store data,realizing the continuous collection and storage of Weibo-related data.On the basis of data acquisition,the data preprocessing module uses Python regular expressions for data cleaning,uses the jieba library for Chinese word segmentation,remove stop words and other text processing,and performs geocoding based on network maps.The data analysis module uses the Wordcloud library to realize the word frequency statistics of public opinion;uses the Snow NLP library based on Bayesian classifier to realize the calculation of the sentiment value of related public opinion data;uses the kernel density function to calculate the spatial distribution density value of the public opinion check-in location data.Client-side functions are implemented using HTML,CSS,React framework and Echarts chart development plug-ins.Ajax asynchronously receives the JSON data packaged by the server,and converts the data into the data format required by different visualization chart types,and finally uses a variety of visualization charts such as word cloud chart,line chart,thematic map,heat map,and dissemination map to display public opinion Data analysis results in the space-time dimension,and visualize the evolution of public opinion in time and space through the browser.This article is based on the geographic space development of the network public opinion spatio-temporal evolution visualization system,which can help users obtain the temporal and spatial distribution characteristics of the network public opinion,explore the correlation between the network public opinion and the geographic space,and provide relevant industry analysts with a geospatial visualization analysis tool based on the network public opinion data..