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What is happening around the world? When and where? Mining the geo-tagged Twitter stream makes it possible to answer the above questions in real-time. Although a single tweet can be short and noisy, proper aggregations of tweets can provide meaningful results. In this paper, we focus on hierarchical spatio-temporal hashtag clustering techniques. Our system has the following features: (1) Exploring...
Geometric rectification problems of the strapdown scene matching for aircraft with attitude variances are investigated. Firstly, by analyzing the main factors causing geometric distortion in the process of real-time image capturing, two coordinates system are established, the real-time image distortion is classified, and the distortion mathematic models are proposed. Then, according to the altitude...
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