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Abubakr A.A. Al-sharif 《国际地球制图》2015,30(8):858-881
Urban development is a continuous and dynamic spatio-temporal phenomenon associated with economic developments and growing populations. To understand urban expansion, it is important to establish models that can simulate urbanization process and its deriving factors behaviours, monitor deriving forces interactions and predict spatio-temporally probable future urban growth patterns explicitly. In this research, therefore, we presented a hybrid model that integrates the chi-squared automatic integration detection decision tree (CHAID-DT), Markov chain (MC) and cellular automata (CA) models to analyse, simulate and predict future urban expansions in Tripoli, Libya in 2020 and 2025. First, CHAID-DT model was applied to investigate the contributions of urban factors to the expansion process, to explore their interactions and to provide future urban probability map; second, MC model was employed to estimate the future demand of urban land; third, CA model was used to allocate estimated urban land quantity on the probability map to present future projected land use map. Three satellite images of the study area were obtained from the periods of 1984, 2002 and 2010 to extract land use maps and urban expansion data. We validated the model with two methods, namely, receiver operating characteristic and the kappa statistic index of agreement. Results confirmed that the proposed hybrid model could be employed in urban expansion modelling. The applied hybrid model overcame the individual shortcomings of each model and explicitly described urban expansion dynamics, as well as the spatio-temporal patterns involved. 相似文献
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赣西下二叠统茅口组均密石英岩的特征,风化习性及其成因 总被引：1，自引：0，他引：1
赣西地区下二叠统茅口组中的均密石英岩是一种特殊类型的硅质岩，广泛分布于萍乡、宜春、分宜、安福、莲花一带，具镶嵌均粒结构和“三连点”结构，颗粒界线平直。矿物成分以α－石英为主；化学成分中ＳｉＯ２含量达９５％以上，Ａｌ２Ｏ３、Ｆｅ２Ｏ３、ＣａＯ、ＭｇＯ含量低。这种岩石风化后．颗粒间易解体，形成具有工业价值的粉石英矿。它是由碳酸盐岩经硅质交代形成。ＳｉＯ２主要来源于母岩以及由粘土矿物分解和海泡石向滑石转化释放而来。 相似文献
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