Map symbols extraction for emergency release based semantic representation

The emergency information released in map is necessary for emergency management and disaster reduction. We present a new method for emergency map symbols extraction from symbol collection based semantic representation in this paper. A novel map symbol semantic matrix is introduced to measure the degree of the semantic representation between the symbol meaning and the emergency event conception. The necessary content factors of emergency for releasing in map are conduced by analyzing the emergency content construction and statistic result of the emergency content published by national disaster reduction center. The fuzzy comprehensive evaluation is proposed to extract the map symbol class. The sub function f_i(k_i) is designed to confirm the grade of i^th evaluation factor(ki) in event extent. By analyzing the example, the effectiveness and practice of this present method are proved.