Application of rough set-based analysis to extract spatial relationship indicator rules: An example of land use in Pearl River Delta     

GE Yong  CAO Feng  DU Yunyan  LAKHAN V. Chris  WANG Yingjie  LI Deyu 《地理学报》2011,21(1):101-117

Spatial relations, reflecting the complex association between geographical phenomena and environments, are very important in the solution of geographical issues. Different spatial relations can be expressed by indicators which are useful for the analysis of geographical issues. Urbanization, an important geographical issue, is considered in this paper. The spatial relationship indicators concerning urbanization are expressed with a decision table. Thereafter, the spatial relationship indicator rules are extracted based on the application of rough set theory. The extraction process of spatial relationship indicator rules is illustrated with data from the urban and rural areas of Shenzhen and Hong Kong, located in the Pearl River Delta. Land use vector data of 1995 and 2000 are used. The extracted spatial relationship indicator rules of 1995 are used to identify the urban and rural areas in Zhongshan, Zhuhai and Macao. The identification accuracy is approximately 96.3%. Similar procedures are used to extract the spatial relationship indicator rules of 2000 for the urban and rural areas in Zhongshan, Zhuhai and Macao. An identification accuracy of about 83.6% is obtained.  相似文献   

多源高分辨率遥感影像智能融合     

李盛阳  张万峰  杨松 《遥感学报》2017,21(3):415-424

本文面向多源高分辨率遥感影像自动化融合的应用需求,探索按需应用的智能化融合方法,充分利用不同分辨率和不同时相的高分辨率多源遥感影像数据资源与特性,研究了影像融合数据源选取的决策树算法,建立了遥感影像融合规则知识库,并自动化选取适合的融合算法,提出了Curvelet_HCS算法,对低频和高频系数选用不同的融合规则,改善了HCS算法的光谱失真问题,可同时融合多光谱影像的多个谱段,并保持更丰富的空间细节信息。根据融合评价结果对遥感影像融合规则知识库进行更新,实验验证表明了该套方法的有效性,为开展大规模智能化的多源遥感影像融合应用提供了重要的方法和技术支撑。  相似文献   

祁连山北缘冲断带的特征与空间变化规律   总被引：3，自引：0，他引：3  

杨树锋  陈汉林  程晓敢  肖安成  何光玉  陈建军  田多文 《地学前缘》2007,14(5):211-221

祁连山北缘冲断带是中国西部一条十分重要的新生代冲断带,它的研究不仅对探讨青藏高原新生代隆升过程和板内造山作用具有重要的意义,而且对酒泉盆地南缘的油气勘探也具有重要的意义。在大量野外地质调查、地震资料解释和钻井资料分析的基础上,开展祁连山北缘冲断带的特征与空间变化规律研究。祁连山北缘冲断带具有多层次的逆冲结构,包括浅层的远距离冲断系统、中层的近距离冲断系统和深层的原地冲断系统,其中原地冲断系统又可划分为原地隐伏和原地显露冲断系统。冲断带变形特征自西向东可分为三段。酒泉盆地南缘的冲断带是一水平位移量较大的、沿着至少三个滑脱面由南而北产生收缩变形的薄皮冲断系统,原地隐伏冲断系统发育很宽。榆木山南缘—民乐盆地南缘西段的冲断带中发育较宽的原地显露冲断系统,而原地隐伏冲断系统较窄。民乐盆地南缘东段—武威盆地南缘发育宽度较大的原地显露冲断系统,由三叠系、石炭系—二叠系、奥陶系、寒武系和岩体组成的冲断片相互叠置,形成冲断带宽广的"显露式"前锋,原地隐伏系统不发育。祁连山北缘冲断带的变形量由西往东逐渐减小。酒西坳陷旱峡剖面构造缩短率为55.1%;民乐盆地魏拉达坂构造剖面缩短率最大为43.4%;武威盆地天桥沟—西马河构造剖面缩短率最大为40.4%。祁连山北缘冲断带西段的变形时期大致开始于9Ma,并以"前展式"向北扩张,变形时间向北变新,前锋断层开始活动时间约为8.3Ma。  相似文献   

基于Gestalt原则的汉字注记配置规则与形式化表达研究   总被引：4，自引：0，他引：4  

王 《测绘学报》2007,36(4):457-462

以汉字注记配置规则为研究对象,借助Gestalt原则,从读图者心理认知的角度对以往的经验型注记配置规则从接近性、连续性、相似性以及共同性四个方面进行分析和解释,在此基础上,使用形式化表达方法对这四个方面进行了定量描述。采用这种方式,不仅能够尽量减少各种因素对地图图解质量的不利影响,而且能为今后汉字注记自动配置知识的形式化、科学化、系统化表达提供基础。  相似文献   

基于语义规则和词向量的台风灾害网络情感分析方法     

林筱妍  吴升 《地球信息科学学报》2022,24(1):114-126

灾害期间的舆情引导有助于维护社会稳定。社交媒体是舆论传播的重要渠道,通过微博评论了解用户的网络情感及关注的话题,可以帮助相关舆情监测部门掌握公众的关注热点,从而选择适当的干预节点来应对网络舆情,并对公众情绪进行疏导,这对于应急管理具有现实意义。现有的研究大多是利用有监督的机器学习方法进行情感分类,这需要人工进行语料的标注,工作量大。本文根据微博评论文本的特点,综合考虑情感词以及表情符号等多重情感源,构建了台风灾害领域情感词典。在此基础上,提出了一种基于情感词语义规则的情感倾向计算方法,以及基于词向量的话题聚类方法。首先,采集了近年5次台风灾害期间共计40多万条微博评论文本,基于大连理工情感词汇本体库进行扩展构建了台风灾害领域情感词典,结合PMI法构建表情符号词典,根据语义规则确定情感倾向,并使用3500条评论文本验证了该方法的有效性。然后,本文基于词向量、TF-IDF与K-means的聚类方法探索灾害期间热点话题。最后,以2020年4号台风“黑格比”为例,基于台风期间的5万余条微博评论文本进行了舆情情感分析,并识别出6类与台风相关的话题。通过时空分析发现,随着时间的推移,微博评论文本的数量发生一定变化,评论数量多的地区大都集中在沿海地区和经济水平高的地区,台风登陆当天浙江省的恐惧情感达到最高。结果表明,基于语义规则和词向量的台风灾害网络情感分析方法,能在类似灾害事件发生时为政府部门掌握和引导网络舆情提供辅助。  相似文献   

Roof model recommendation for complex buildings based on combination rules and symmetry features in footprints     

Xuke Hu  Alexey Noskov 《International Journal of Digital Earth》2018,11(10):1039-1063

Currently, very few roof shape information for complex buildings is available on OSM. Moreover, additional data requirements (e.g. 3D point clouds) limit the applicability of many roof reconstruction approaches. To mitigate this issue, we propose an approach to roof shape recommendations for complex buildings by exploring the inherited characteristics of building footprints: the disclosure of rectangles combinations in a partition of footprints and the symmetrical features of footprints. First, it decomposes a complex footprint into rectangles by using an advanced minimal non-overlapping cover algorithm. Second, a graph-based symmetry detection algorithm is proposed to identify all the symmetrical sub-clusters in partitions. Then, a set of selection rules are defined to rank partitions, and the best ones are chosen for roof shape recommendation. Finally, a set of combination rules and a symmetry rule are defined. It enables to evaluate the probability of a footprint being a certain combination of roof shapes. Experimental results show the growth of the probability of correctly recommending roof shapes for single rectangles and buildings from a prior probability of 17–45% and from a prior probability of 0.29–14.3%, removing 60% and 93% of the incorrect roof shape options, respectively.  相似文献   

湖南崇阳坪地区沙溪钨矿床地质特征及找矿前景分析   总被引：1，自引：0，他引：1  

孔令兵  吕书君  李永德 《华南地质与矿产》2014,(4):375-382

沙溪钨矿床是近年来在崇阳坪地区新发现的一个产于中华山岩体接触带内的矿床,其资源量有望达大型规模。本文通过大量的野外资料,在现有勘查成果的基础上,对矿床的地质特征、矿化富集规律、找矿标志及找矿前景进行了分析研究,初步认为矿区钨矿化具有分段富集的现象,富集部位与含脉密度增大、云英岩化增强等部位吻合,且从地表浅部向深部,在一定程度上表现出细脉变多、矿化加强的趋势,已发现矿体深部很有可能存在厚大的钨矿体,找矿前景较好。  相似文献   

南方海相页岩气“二元富集”规律——四川盆地及周缘龙马溪组页岩气勘探实践认识   总被引：9，自引：0，他引：9  

郭旭升 《地质学报》2014,88(7):1209-1218

继JY1井龙马溪组页岩测试获得高产工业气流,实现南方海相页岩气的战略突破之后,近期焦石坝地区多口开发井获得高产天然气流,展现出四川盆地海相页岩气勘探的良好前景。通过对四川盆地及周缘多口井的岩性、有机地球化学、岩石矿物含量、物性、储集类型、微观孔隙结构特征、裂缝发育程度、含气量和气井产量、压力等钻探成果及分析测试资料进行深入解剖研究,探索并提出了复杂构造区海相页岩气"二元富集"规律,即:深水陆棚优质泥页岩发育是页岩气"成烃控储"的基础;良好的保存条件是页岩气"成藏控产"的关键。本文对中国南方海相页岩气的高效勘探开发具有重要的借鉴、指导意义。  相似文献   

Liability rules for international trading of greenhouse gas emissions quotas     

《Climate Policy》2013,13(1):85-108

Abstract

To reduce the costs of mitigating greenhouse gas emissions in accordance with the Kyoto protocol, international trades of emissions quotas are allowed. The revenue from the sale of quotas may exceed the sanctions for non-compliance if these penalties are weak or poorly enforced. Under these circumstances emissions trading enables a country to benefit financially through non-compliance. To counter non-compliance due to trading a range of liability proposals have been suggested. Using a simple global model, we analyze the economic and environmental performance of these proposals for the first commitment period. In addition, the proposals are tested for their sensitivity to national circumstances and to market power. We find that penalties are sufficient to deter non-compliance if they are high enough and are effectively enforced. If the non-compliance penalties are weak or poorly enforced, the permanent reserve proposal is best able to ensure compliance by sellers at a cost similar to the competitive market equilibrium. While not sufficient to ensure compliance on their own, eligibility requirements and annual retirement of AAUs equal to actual emissions contribute to compliance at little or no cost. Hence, such provisions could complement other liability proposals.  相似文献   

内蒙古三河铅锌矿床的矿化特征及构造控矿规律     

毕亚强  李永新  陈文科  马虎彪  于超  冯宇  周林  岳雷  杨在京  扈德峰 《地质力学学报》2022,28(1):36-49

以内蒙三河铅锌矿床为研究对象,通过详细的野外和井下地质调研、 勘查资料综合分析、 构造地质测量、矿石和蚀变岩的岩石学和矿物学研究等,对矿区主要的构造类型、产状特征、脉体和蚀变的类型及矿化与断裂构造的关系进行了详细的研究.研究结果表明,矿区矿体主要呈脉状-网脉状产于北西西向断裂构造中.根据矿区断裂-脉体类型-蚀变的关系可...  相似文献