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Road network is the important part of the urban map database, and generalization of urban road network is an important issue for city map database management. The strategy of road selection and the maintenance of spatial pattern are two major challenges in the generalization of road networks. An effective process for road network generalization is introduced in this paper. The first step is to extract...
Association rule is one of the most important rules in nature. Each type of object in a remotely sensed image relates to special association rules, thus association rules are important features for image classification, and the mining and rational selection of the effective rules is the key issues for accurate classification. In this paper, an approach that integrates association rules analysis and...
A multifractal based approach to extracting road information is presented in this paper. As a case study, a Geoeye-1 image is used for the experiment. The result is compared with the results from Sobel operator, Roberts operator, Prewitt operator. It is shown that the proposed multifractal based method can extract different types of road information more effectively.
Mobile heavy metals and toxic matter from underground polluting sources may be transported upwards to the ground surface under the action of ascending geogas microbubble flow. In this paper both stable and unstable 3-D physical-mathematical models are set up to describe the matter transport process from point sources by ascending microbubble flows. The spatial dispersion of the jet halo formed by...
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