GIS-based Emergency Event Case Search Engine

With the rapid development of the Internet, the information on the net becomes the main source of the information. Since that, how to exactly get the information we want from the large amount of information is the main problem that general search engine have solved. But with the development of the information multiplicity, we should provide domain-specific search engine for some domain users to fulfill their specific requirements.Based on construction of the disaster reduction and service website, we propose and complete the GIS-based emergency event case search engine to provide the exactly search of the emergency event case, which will finally help the disaster salvation and emergency management.Focused web crawler is the basis of the domain-specific search engine, how to improve the general web crawler to meet the requirement of the specific domain is one of the main problems we have to solve. In this paper, through the sort of the emergency event case website and improvement of the crawl algorithm, we get our emergency focused web crawler.With the foundation of the Dublin Core ontology, we design our disaster metadata database, to store the typical event case information semiautomatic extracted from the webpage, using for the exactly search. We detailedly describe the emergency event case information extraction rule in the paper.We establish the disaster reduction glossary to be our word segmentation core dictionary, and using the open-source framework Lucene to provide the full text information retrieval service. In addition, using the GIS technology, we offer the visualized way to demonstrate the emergency event case.Finally we develop the emergency event case search engine demo to confirm our study in this paper.