An information acquisition method and system based on social media emergencies

Abstract

The invention provides an information acquisition method and system based on social media emergencies. The method comprises the following steps: S1, constructing a corpus of emergencies; S2, using a support vector machine classifier to carry out non-emergency event classification filtering, and achieving first-stage classification; And S3, performing positive and negative class prediction classification by using a naive Bayes classifier to realize second-stage classification. According to the invention, corpus acquisition of related keywords is carried out on the social media through the crawler; A support vector machine classifier is used for carrying out non-emergency event classification filtering, first-stage classification is achieved, a naive Bayes classifier is used for carrying outpositive and negative class prediction classification, second-stage classification is achieved, the information classification precision is improved by 2.9% compared with the result of non-instant seismic information screening, and the accuracy of information classification is improved by 2.9%. Compared with the prior art, the method has the advantages that the value of the F-Masure is increasedby 2.6%, the problem that the text classification result is low in precision in the prior art is solved, the classification precision is improved, a decision maker can control disaster events easily,and a basis is provided for decision making.

Description

technical field [0001] The invention relates to the technical field of data mining, in particular to an information acquisition method and system based on social media emergencies. Background technique [0002] Traditional emergency response information is collected, sorted, and released by official or authoritative organizations. Its shortcomings are mainly manifested in: the collection process lacks public participation and feedback, and the information source is relatively single; the timeliness of collection is low, and even any information about the event cannot be obtained in time for a period of time after the emergency occurs, such as major natural disasters; information dissemination The direction is from the official to the public, showing a one-way flow, lacking feedback and communication. These deficiencies make it difficult for traditional emergency information to meet the needs of timely, effective and reasonable handling of emergencies. [0003] Social media...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an information acquisition method and system based on social media emergencies, aiming to solve the problem of low accuracy o

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