不同系统中统计符号库的设计     

闫浩文  杨维芳 《四川测绘》1999,22(4):167-168

统计符号是地图制图中最受欢迎和最为广泛应用的地图符号之一。本文就应用于电子制图系统、机助制图系统、决策支持系统中的统计符号库设计的不同进行了论述。  相似文献   

地震活动的随机场特征          下载免费PDF全文

马禾青  杨明芝 《地震工程学报》2018,40(3):542-548

地震活动是一种随机自然现象,将其基本要素变量看作是空间和时间的函数,它们具有随机场的基本特征,由此得到地震活动的随机场描述。重点讨论在一定条件下地震活动能量场和频次场的统计特征及地震活动场的平稳性问题,说明应用随机场方法研究地震活动的合理性。  相似文献   

俯冲带板间地震水平加速度谱阻尼修正系数研究          下载免费PDF全文

张潇男  姜明秀  康莉莉 《世界地震工程》2019,35(4):082-94

基于日本K-net和Kik-net台站的俯冲带地区板间地震的数据,分SCⅠ~SCⅣ四种场地分别建立了水平向加速度反应谱阻尼修正系数模型。利用最小二乘法进行回归拟合,拟合公式采用对数三次项提高拟合精度。通过统计检验和残差分析,验证模型的拟合效果。研究表明:低于5%与高于5%阻尼比的阻尼修正系数变化趋势差异明显,分别在周期点0.3~0.5s区间达到极大值和极小值;不同场地类别的阻尼修正系数统计上显著不同,建立不同场地类别的模型是必要的;模型残差的标准差分布在0.012~0.712之间,建立的阻尼修正系数模型较好的拟合了阻尼修正系数随谱周期和阻尼比的变化趋势。  相似文献   

不同实验条件下软质岩石地基承载力分析     

张云  杨忠 《贵州地质》2006,23(2):137-141

现行《岩土工程勘察规范》(GB50021-2001)及《建筑地基基础设计规范》(GB50007-2002)规定,确定岩石地基承载力特征值常用方法有取岩样作室内试验和现场原位载荷试验等。软质岩的岩石试样作室内试验时,因环境条件与实地有明显的差异,试验结果多不理想,现场静载试验在实际环境条件下进行,能更好地挖掘软质岩石地基承载力特征值的潜力,减少基础工程造价。  相似文献   

Statistical functions used for spatial modelling due to assessment of landslide distribution and landscape-interaction factors in Iran     

《地学前缘(英文版)》2020,11(4):1257-1269

Landslides influence the capacity for safe and sustainable development of mountainous environments.This study explores the spatial distribution of and the interactions between landslides that are mapped using global positioning system(GPS) and extensive field surveys in Mazandaran Province,Iran.Point-pattern assessment is undertaken using several univariate summary statistical functions,including pair correlation,spherical-contact distribution,nearest-neighbor analysis,and O-ring analysis,as well as bivariate summary statistics,and a markcorrelation function.The maximum entropy method was applied to prioritize the factors controlling the incidence of landslides and the landslides susceptibility map.The validation processes were considered for separated 30%data applying the ROC curves,fourfold plot,and Cohen's kappa index.The results show that pair correlation and O-ring analyses satisfactorily predicted landslides at scales from 1 to 150 m.At smaller scales,from 150 to 400 m,landslides were randomly distributed.The nearest-neighbor distribution function show that the highest distance to the nearest landslide occurred in the 355 m.The spherical-contact distribution revealed that the patterns were random up to a spatial scale of 80 m.The bivariate correlation functions revealed that landslides were positively linked to several linear features(including faults,roads,and rivers) at all spatial scales.The mark-correlation function showed that aggregated fields of landslides were positively correlated with measures of land use,lithology,drainage density,plan curvature,and aspect,when the numbers of landslides in the groups were greater than the overall average aggregation.The results of analysis of factor importance have showed that elevation(topography map scale:1:25,000),distance to roads,and distance to rivers are the most important factors in the occurrence of landslides.The susceptibility model of landslides indicates an excellent accuracy,i.e.,the AUC value of landslides was 0.860.The susceptibility map of landslides analyzed has shown that 35% of the area is low susceptible to landslides.  相似文献   

基于案例推理的统计地图表示方法智能选取中的应用   总被引：1，自引：1，他引：0  

李洪省  王英杰  余卓渊  韩嘉福  罗斌 《地球信息科学学报》2009,11(6):819-825

地图符号的选择在空间信息可视化中至关重要。本文基于案例推理的研究范式和专题制图过程,提出了一种智能化专题制图的CBR框架,它依赖的知识主要是系统所存储的专题地图设计过程中解决问题的具体记录。本文从案例库内容设计、案例表达和数据库模式、案例相似性计算和案例检索等方面重点研究了CBR在统计地图表示方法智能选取中的应用,并以《中国人口地图集》为蓝本,以myCBR为工具,展现了CBR在专题地图设计知识获取、表达和推理中的应用潜力。  相似文献   

A Medium/Long-Range Forecast of Paci c Subtropical High Based on Dynamic Statistic Model Reconstruction          下载免费PDF全文

HONG Mei  ZHANG Ren  LIU Kefeng  YU Dandan 《Acta Meteorologica Sinica》2007,21(3):376-384

Based on the 500-hPa geopotential height eld series of T106 numerical forecast products, by empirical rthogonal function (EOF) time-space separation, and on the hypotheses of EOF space-models being stable,he EOF time coe cient series were taken as dynamical statistic model variables. The dynamic system econstruction idea and genetic algorithm were introduced to make the dynamical model parameters optimized, and a nonlinear dynamic statistic model of EOF separating time coefficient series was established. By he model time integral and EOF time-space reconstruction, a medium/long-range forecast of subtropical high was carried out. The results show that the dynamical model forecast and T106 numerical forecast were approximately similar in the short-range forecast (65 days), but in the medium/long-range forecast>5 days), the forecast results of dynamical model was superior to that of T106 numerical products. A new method and idea were presented for diagnosing and forecasting complicated weathers such as subtropical high, and showed a better application outlook.  相似文献   

土地可持续利用评价中GDP数据空间化方法的研究   总被引：7，自引：0，他引：7  

钟凯文  黎景良  张晓东 《测绘信息与工程》2007,32(3):10-12

分析了社会经济统计数据的空间化方法及GDP空间分布情况,提出了一种应用遥感和GIS技术,以土地利用类型为基础,结合面积权重与反距离加权的GDP数据空间化方法,实现了广东省韶关市GDP空间化.  相似文献   

日常地籍管理信息系统的设计与建立--以浦东新区第一规划土地所为例     

李国标  王珏华 《测绘与空间地理信息》2000,23(2):9-11

浦东规划土地局第一土地所在日常地籍管理中,应用地籍管理信息系统取得显著的成效.本文以此为实例,阐述日常地籍管理信息系统的设计与建立方法、过程;并且从规土一所对软件具体应用和取得的成功角度,阐述GIS在日常地籍管理中应用的必要性、迫切性.  相似文献   

硼酸盐水溶液中硼物种的存在形式及影响因素          下载免费PDF全文

张爱芸  姚燕 《盐湖研究》2007,15(2):50-56

根据以往相关的研究报道,综述了含硼水溶液中硼物种的存在形式,及其与总硼浓度、溶液pH值、溶液离子强度、温度、压力等因素的关系。随着总硼浓度的提高,硼氧配阴离子的聚合度加大,在pH值较高或较低时,聚硼离子的含量较少,主要以H3BO3和B(OH)4-的形式存在;同时,指出含硼水溶液存在普遍的过饱和现象,我国含硼盐湖卤水中的硼物种可以用B4O72-的综合统计形式表示。总结了硼酸盐水溶液中各种硼氧配阴离子的FT-IR,Raman和NMR的归属。  相似文献