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一、DM在GIS中的应用
DM(Data Mining数据挖掘)是指把人工智能、机器学习与数据库等技术结合起来,由计算机自动的从数据库或数据仓库中的大量数据中揭示出隐含的、先前未知的并具有潜在价值的信息或模式,以解决数据量大而知识贫乏这一困扰专家系统(ES)的知识瓶颈问题的非平凡过程。这一概念一经提出,立即引起了学者、软件开发商和用户的极大兴趣, 相似文献
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继7月房价每平方米下跌48元之后,8月份郑州房价继续回落。近日,中国房地产指数系统百城价格指数发布,8月份郑州住宅均价继续下滑,环比跌幅0.62%,达到6779元/平方米。业内专家认为,从数据来看,在楼市深度博弈中,目前郑州房价正处于波动期。而众多开发商针对“金九银十”不约而同打出了“特价”牌,也在某种程度上印证了这一点。 相似文献
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曾邦华 《资源导刊(河南)》2011,(9):41-41
继7月房价每平方米下跌48元之后,8月份郑州房价继续回落。近日,中国房地产指数系统百城价格指数发布,8月份郑州住宅均价继续下滑,环比跌幅0.62%,达到6779元/平方米。业内专家认为,从数据来看,在楼市深度博弈中,目前郑州房价正处于波动期。而众多开发商针对“金九银十”不约而同打出了“特价”牌,也在某种程度上印证了这一... 相似文献
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"对于开发企业而言,是精品重要,还是市场重要?精品和市场能否有机统一?""设计公司追求精品,但却在甲方要求保质保速的前提下屡屡受挫,如何才能出精品?"这是一场有趣的对话。面对市场而坚持设计质量的建筑师与面对建筑师的坚持而一再强调市场需求的开发商,"天然不是一家"的他们却齐聚一堂,共话设计与市场。这样的交流理应充满"碰撞",但却意外地展现出些许"和谐"。在市场大潮中,建筑师,特别是非国 相似文献
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Relationships between Interannual and Intraseasonal Variations of the Asian-Western Pacific Summer Monsoon Hindcasted by BCC_CSM1.1(m) 总被引:4,自引:0,他引:4
LIU Xiangwen ;WU Tongwen ;YANG Song ;LI Qiaoping ;CHENG Yanjie ;LIANG Xiaoyun ;FANG Yongjie ;JIE Weihua ;NIE Suping 《大气科学进展》2014,31(5):1051-1064
Using hindcasts of the Beijing Climate Center Climate System Model, the relationships between interannual variability (IAV) and intraseasonal variability (ISV) of the Asian-western Pacific summer monsoon are diagnosed. Predictions show reasonable skill with respect to some basic characteristics of the ISV and IAV of the western North Pacific summer monsoon (WNPSM) and the Indian summer monsoon (ISM). However, the links between the seasonally averaged ISV (SAISV) and seasonal mean of ISM are overestimated by the model. This deficiency may be partially attributable to the overestimated frequency of long breaks and underestimated frequency of long active spells of ISV in normal ISM years, although the model is capable of capturing the impact of ISV on the seasonal mean by its shift in the probability of phases. Furthermore, the interannual relationships of seasonal mean, SAISV, and seasonally averaged long-wave variability (SALWV; i.e., the part with periods longer than the intraseasonal scale) of the WNPSM and ISM with SST and low-level circulation are examined. The observed seasonal mean, SAISV, and SALWV show similar correlation patterns with SST and atmospheric circulation, but with different details. However, the model presents these correlation distributions with unrealistically small differences among different scales, and it somewhat overestimates the teleconnection between monsoon and tropical central-eastern Pacific SST for the ISM, but underestimates it for the WNPSM, the latter of which is partially related to the too-rapid decrease in the impact of E1 Nifio-Southern Oscillation with forecast time in the model. 相似文献
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在不久前的地荒问题争论上,政府和开发商之间唇枪舌剑,互不相让,双方都言之凿凿,却都回避了更加长远的视野里中国人的土地越来越少的现实.而实际上鼓吹地荒的人,并不是打算提醒大家注意长期的土地稀缺问题,而可能不过是关注自己目前的开发规模,关注已有的房子如何能够在高价出售时不受指责;而政府用目前还有多少闲置土地来反驳地荒论,则隐含了一个只要在闲置土地上盖了房子,就不会使土地减少的悖论. 相似文献
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送给人的礼物,能不能再拿回来?按今天的常识,多半是不行的。但在西周的时候,情况却不是这样的,比方说周王赐给奴隶主贵族们土地,就跟开发商给明星们送房子一样,只要高兴,想送给谁就送给谁,想送多少就送多少。 相似文献