共查询到20条相似文献，搜索用时 109 毫秒
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空间数据增量信息提取是空间数据库增量更新的基础,而要素几何匹配则为空间数据增量信息提取的关键流程之一。针对面状要素几何匹配时所产生的单一匹配算子匹配准确度低,以及多算子加权匹配算法匹配效率低、冗余度高、结果不准确等情况,本文提出一种基于多层次匹配的面状要素几何匹配算法。该算法以反映面状要素位置、大小、形状特征的质心匹配算子、面积重叠度算子以及转向角函数匹配算子为基础,并按各算子复杂度进行层次匹配规则设计,以提高算法效率、保证匹配的准确性。本文通过2种方法进行对比实验,结果表明：层次匹配算法匹配完整度和准确度均能达到90%以上,可以很好地进行面状要素几何匹配;与加权匹配方法相比效率更高,代价更小,且所得匹配结果比加权匹配方法所得结果更加准确。 相似文献
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党的十六届五中全会《关于国民经济和社会发展第十一个五年规划的建议》提出了建设社会主义新农村的历史任务。为了制定好“十—五”规划．2005年5月．根据国务院领导的指示．由中研室、中农办、财政部、建设部、人民银行和贵州省的有关同志，到韩国就“新村运动”进行了考察。我作为考察团团长，深深感到当前要认真贯彻落实五中全会《建议》的精神， 相似文献
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方先知 《国土资源导刊(湖南)》2006,3(1):8-11
一、中央和省委关于国土资源规划工作的有关精神(一)中央对国土资源“十一五”工作做出了全面部署。党的十六届五中全会通过的《中共中央关于制定国民经济和社会发展第十一个五年规划的建议》对“十一五”期间的国土资源主要工作进行了部署。在《建议》十个方面的四十六条中,与 相似文献
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地下工程风险分析的层次分析法及MATLAB应用 总被引：1，自引：0，他引：1
针对层次分析法应用的不足，探讨了层次分析法在MATLAB中的实现过程，编制了相应的子函数程序，解决了在层次分析法应用中，采用近似的方法求解矩阵最大特征值和特征向量的问题。以基坑工程风险分析为例，分析了层次分析法MATLAB程序在地下工程风险分析中的应用。结果表明，层次分析法结合MATLAB应用，能较好地进行地下工程多因素的风险分析。 相似文献
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按照厅党组的统一安排，我参加了机关公务员培训学习。通过学习感到确实收获很大，特别是系统全面地学习了《中共中央关于制定国民经济和社会发展第十一个五年规划的建议》、《中华人民共和国国民经济和社会发展第十一个五年规划纲要》和《浙江省国民经济和社会发展第十一个五年规划纲要》。目前正逢新一轮土地利用总体规划编制，结合本职工作，更深刻领会到必须要以国民经济和社会发展规划为依据，努力做好新一轮土地利用总体规划编制工作。 相似文献
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方文 《资源导刊(河南)》2011,(10):38-38
据中国之声《新闻纵横》报道,十一假期,人们的手机上收到的除了亲朋好友的祝福短信,恐怕就是众多不厌其烦的楼盘广告。＂十一黄金周＂以往都是各大楼盘的销售旺季,但是今年,全国各主要城市商品房销售却比往年冷清不少。＂金九银十＂为何变成了＂冷九寒十＂,楼市是否就此迎来下行的拐点？ 相似文献
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阐述了排课系统的管理层次、操作权限分配、资源管理、网络排课的具体实现过程。本系统较好地解决了多个校区、多个学院之间的分配资源和排课冲突问题。其特点是资源统一管理、分散使用，利用校园网进行教学管理，不受时间、空间的限制。 相似文献
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介绍解五维波动问题的微分算子级数法，首先引进数性算子概念及微分算子级数法；其次．推导出了求解公式；最后通过求解公式求解了一些五维波动方程的例题，得出任何维数（n≥5）的波动方程柯西问题都可以用微分算子级数法求其解。 相似文献
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本文对浙江省化石观赏石的主要类型、时空分布等情况作了简要叙述，并结合国际上化石观赏石的收藏和贸易情况，就浙江省的开发问题提出了一些看法。浙江省的恐龙蛋、鱼、螺、贝、虾及笔石等化石具有地方特色，且有一定的数量。这些化石在西方颇受欢迎，有较多的经营者和收藏者。 相似文献
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The aviation industry has become one of the top ten greenhouse gas emission industries in the world.China's aviation carbon emissions continue to increase,but t... 相似文献
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Wang Peilie 《中国海洋湖沼学报》1985,3(1):37-47
Minke whales caught in the Yellow Sea range from 4.16 m to 8.60 m in length with an average length of 6.93 m for the female
and 6.14 m for the male. Sex ratio of the female is 74.3%. The pregnancy ratio of all sexually matured females is 65.8%. The
minimum size of the pregnant whale observed is 6.60 m in length. Females having a body length of more than 7 m long are all
sexually matured.
According to the studies on the embryos obtained from the females caught in the northern Yellow Sea, there is only one breeding
season each year. Mating mostly occurs from July through September, and the length of pregnancy is ten to eleven months with
the peak of calving from May through July. Most females breed one calf each time, only two cases with twins. Sex ratio of
female fetus is 56.6%, and the newly born calf measures 250–270 cm in body length.
This paper was published in Chinese inOceanologia et Limnologia Sinica
13 (4): 338–345. 相似文献
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建立中国水资源信息学学科体系的刍议 总被引：2，自引：0，他引：2
路京选 《地球信息科学学报》2004,6(1):11-13
20世纪90年代初,欧洲出现新兴边缘学科水资源信息学,在短短10余年时间里得以迅速发展。我国近年来的水利信息化进程明显加快,数字水利、数字流域等发展迅速。目前,正在从传统水利向现代水利过渡,以水利信息化带动水利产业化,成为我国今后水利发展的主要方向。本文在介绍这一新兴学科基础上,建议尽快建立我国自己的水资源信息学学科体系,为水利信息化的不断深入以及可持续发展做好理论准备。 相似文献
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Xiao-qing Chen Jian-gang Chen Peng Cui Yong You Kai-heng Hu Zong-ji Yang Wei-feng Zhang Xin-po Li Yong Wu 《山地科学学报》2018,15(4):779-792
On August 8, 2017, a Ms = 7.0 magnitude earthquake occurred in the Jiuzhaigou Valley, in Sichuan Province, China(N: 33.20°, E: 103.82°). Jiuzhaigou Valley is an area recognized and listed as a world heritage site by UNESCO in 1992. Data analysis and field survey were conducted on the landslide, collapse, and debris flow gully, to assess the coseismic geological hazards generated by the earthquake using an unmanned aerial vehicle(UAV), remote-sensing imaging, laser range finders, geological radars, and cameras. The results highlighted the occurrence of 13 landslides, 70 collapses, and 25 potential debris flow gullies following the earthquake. The hazards were classified on the basis of their size and the potential property loss attributable to them. Consequently, 14 large-scale hazards, 30 medium-sized hazards, and 64 small hazards accounting for 13%, 28%, and 59% of the total hazards, respectively, were identified. Based on the variation tendency of the geological hazards that ensued in areas affected by the Kanto earthquake(Japan), Chi-chi earthquake(Taiwan China), and Wenchuan earthquake(Sichuan China), the study predicts that, depending on the rain intensity cycle, the duration of geological hazard activities in the Jiuzhaigou Valley may last over ten years and will gradually decrease for the following five to ten yearsbefore returning to pre-earthquake levels. Thus,necessary monitoring and early warning systems must be implemented to ensure the safety of residents,workers and tourists during the construction of engineering projects and reopening of scenic sites to the public. 相似文献
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Xinxian Lu 《中国地理科学(英文版)》1992,2(3):256-265
The developed regions are faced with the problems of regional comprehensive development, and the research on regional comprehensive
development has become a trend in the world. To optimize regional industrial structure and to select and determine scientifically
the spatial development strategy of regional industries are the central themes to be solved for the research on regional comprehensive
development in the developed regions. This paper proposed the basis for optimizing regional industrial structure, and the
main factors of selecting and determining the regional leading industries. Based on this, the paper puts forward the leading
industries and the spatial development strategy in Shanghai-Nanjing-Hangzhou area in the future ten or more years. Combined
with the situation of Shanghai-Nanjing-Hangzhou area, the paper also discusses some problems of locating superior developing
axis to benefit the rational distribution of regional productive forces. 相似文献
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陆心贤 《中国地理科学(英文版)》1992,(3)
The developed regions are faced with the problems of regional comprehensive development, and the research on regional comprehensive development has become a trend in the world. To optimize regional industrial structure and to select and determine scientifically the spatial development strategy of regional industries are the central themes to be solved for the research on regional comprehensive development in the developed regions. This paper proposed the basis for optimizing regional industrial structure, and the main factors of selecting and determining the regional leading industries. Based on this, the paper puts forward the leading industries and the spatial development strategy in Shanghai-Nanjing-Hangzhou area in the future ten or more years. Combined with the situation of Shanghai-Nanjing-Hangzhou area, the paper also discusses some problems of locating superior developing axis to benefit the rational distribution of regional productive forces. 相似文献
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我国洪涝灾害频发且危害巨大,为有效防灾、减灾和救灾,需建立洪涝灾害事件信息模型,表示和共享洪涝灾害信息。然而,目前事件信息模型主要是表示静态信息,缺乏对洪涝灾害事件动态过程的表示。本文从观测角度出发,建立顾及洪涝灾害事件阶段和动态过程的洪涝灾害事件信息模型。围绕洪涝灾害事件信息模型,提出了10类需建模的元素,并以MOF（Meta Object Facility）建模框架构建了十元组模型,通过映射方法实现模型编码方案与事件模式语言的映射。最后,以2010年梁子湖洪涝灾害模拟为例,开展了模型分阶段建立过程实验。结果表明,本文提出的模型能表示洪涝灾害事件的动态信息和实现洪涝灾害事件的动态建模。 相似文献