Because of the uncertainty of drought disaster events, it is often difficult to obtain accurate information of their probability. In this paper, we use information distribution and interior-outer-set model to tackle this challenging problem by obtaining the possibility - probability distribution of drought disaster events, which can express the fuzziness of probability of drought disaster events. We take a sample data set of the precipitation of Nanjing and Xuzhou, and calculate the possibility - probability distribution. The results demonstrate the feasibilities and effectiveness of the proposed method.
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