| The occurrence of natural disasters in our country is quite serious, and the nature disaster is quite complicated, for disaster emergency measures need to constantly strengthen and improve to improve the defense capability of our country. Foreign research on emergency measures more extensive is relatively mature, related to the occurrence of natural disasters will take effective emergency plan, the greatest degree of reducing natural disasters caused by human life and property losses.Research in the emergency in China need to greatly improve, the complexity of the situation of natural disasters, need a base of natural disaster emergency applications symbol classification system, provide the foundation for disaster emergency disaster information. This paper studies a set of symbols classification system, the basis of natural disasters for natural disaster emergency provide reference paper basis. Symbol data has been very widely used now, but cannot share as symbolic circulation obstacle in natural disasters symbol sharing is urgent demand.This article from the perspective of facing the emergency, the study of natural disasters in the geographic information symbol system, analyzes the classification of types of natural disasters and carried out in accordance with the severity of the disaster system classification, according to the different color symbol shows different severity of natural disasters. The existing geographic information sharing way, sign had XML language to describe the general standard format, Web service technology, and international symbol. Established in accordance with the geographic information classification system of geographic information symbol library, use the generation of uDig software visualization can be Shared symbol encoding, as a natural disaster geographical information symbols for classification and coding, storage into SLD files can be Shared. To establish the theoretical framework of sharing platform of Web service technology applied to the actual operation platform, add Shared symbol code on background operation platform, enrich your symbol database sharing service platform, provides the user with a natural disasters of geographic information can be Shared symbols. In the Shared directory service platform to establish natural disasters in symbols, for users to access or query need emergency geographic information Shared symbols. Sharing platform based on Web service, using the international general standard of OGC SLD description emergency notation style, can be used for different applications, without having to repeat design notation style, greatly increased the use efficiency of emergency geographic information symbols, achieve the goal of sharing. |
