Agent技术在分布式GIS中的应用研究   总被引：8，自引：0，他引：8  

罗英伟  汪小林  许卓群 《遥感学报》2003,7(2):153-160

首先分析了分布式计算技术的发展，详细介绍了当今主流的分布计算技术——Agent技术、分布式GIS技术是以分布式计算技术为依托的，Agent技术将为分布GIS带来新的技术发展；随后，深入分析了Agent技术在分布式GIS中的应用，并结合已有的研究重点介绍了基于Agent的分布式GIS建模、空间信息查找与获取、WebGIS服务体系、空间辅助决策以及GIS互操作等。  相似文献   

2016年4月16日熊本地震滑动分布反演与分析          下载免费PDF全文

解全才  张庆云  马强  张景发 《世界地震工程》2021,(3):189-199

综合利用强震数据、GPS数据和InSAR数据基于双断层模型反演熊本地震滑动分布,通过选择合理的介质模型和平滑因子,分别对数据进行单独反演和联合反演。从结果分析可以看出:三种数据联合反演的结果最优,最终滑动模型为:断层1走向为236°,倾角65°,滑动角-150.6°,最大滑动量为6m;断层2走向为206°,倾角72°,滑动角-155°,最大滑动量为4m。基于K-net和Kik-net获取永久位移快速反演得到的滑动分布结果与基于GPS数据,Sentinel-1A InSAR数据反演甚至联合反演得到滑动分布结果比较一致,表明大震后利用高密度强震动台网后快速获取滑动分布用于震后应急响应和灾害评估是切实可行的,同时认为此次地震发震断层为右旋走滑的断层系统。  相似文献   

GPS动态相对定位的自适应Kalman滤波算法     

李俊毅  郝金明  李军正 《全球定位系统》2013,(5):43-46

GPS动态数据处理中广泛应用卡尔曼滤波,经典Kalman滤波认为预报误差是白噪声,服从零均值的正态分布,并利用动态噪声协方差矩阵来控制它对当前信息的影响,但实际测量定位中难以保证观测对象的规则运动,因而容易出现模型误差。针对GPS动态定位的这一问题,探讨了在实际应用中存在模型误差时的卡尔曼滤波,介绍了一种自适应Kalman滤波算法,该法顾及了载体机动加速及接收机发生周跳时的影响,减少了滤波发散的机会。  相似文献   

Architecture of HLA based distributed virtual geographic environment     

Xu Bingli  Lin Hui  Gong Jianhua 《地球空间信息科学学报》2013,16(2):127-134

Integrating the theory of distributed virtual geographic enviroments (DVGE) and high level architecture(HLA), the architecture of DVGE based on HLA is designed. The data flow and the object models of the architecture are also discussed. The architecture basically meets the need of DVGE in real-time communication, distribution, collaboration, reusing and interoperation, expansion, and standard.  相似文献   

Flood simulation using different sources of rainfall in the Huong River,Vietnam / Simulation d'inondation à l'aide de différentes sources d'information pluviométrique dans le bassin de la Rivière Huong,Vietnam     

《水文科学杂志》2013,58(5):909-917

Abstract

The possibility of simulating flooding in the Huong River basin, Vietnam, was examined using quantitative precipitation forecasts at regional and global scales. Raingauge and satellite products were used for observed rainfall. To make maximum use of the spatial heterogeneity of the different types of rainfall data, a distributed hydrological model was set up to represent the hydrological processes. In this way, streamflow simulated using the rainfall data was compared with that observed in situ. The forecast on a global scale showed better performance during normal flow peak simulations than during extreme events. In contrast, it was found that during an extreme flood peak, the use of regional forecasts and satellite data gives results that are in close agreement with results using raingauge data. Using the simulated overflow volumes recorded at the control point downstream, inundation areas were then estimated using topographic characteristics. This study is the first step in developing a future efficient early warning system and evacuation strategy.  相似文献   

Objective quantitative spatial verification of distributed snow cover simulations—an experiment for the whole of Switzerland / Vérification quantitative spatiale objective de simulations distribuées de la couche de neige—une étude pour l'ensemble de la Suisse     

《水文科学杂志》2013,58(1):179-191

Abstract

Skill measures based on 2 × 2 contingency tables were adopted for the quantitative internal verification of snow cover simulations with the distributed hydrological model PREVAH, which provided a high resolution simulation of the hydrological cycle for Switzerland for the 1981–2000 period. Simulated snow cover has been compared to data monitored at 103 stations. The skill measures provide valuable quantitative indications on the correspondence of the modelled and observed values. The analysis with objective scores reveals better model estimates of snow cover presence and distribution in locations above 1000 m a.s.l., relative to lower areas. For explicit spatial verification, 20 NOAA-AVHRR snow cover scenes were compared to the model results. The spatial and temporal differences in the agreement between observed and simulated snow cover patterns were assessed. PREVAH provides reliable snow cover simulations. The results also reveal that scores from 2 × 2 contingency tables provide objective methodological support in the quantitative estimation of the agreement between observed and simulated spatial patterns.  相似文献   

SURFACE EXPOSURE DATING: REVIEW AND CRITICAL EVALUATION     

Ronald I. Dorn  Fred M. Phillips 《自然地理学》2013,34(4):303-333

The past decade has seen the development and application of over a dozen new methods for quantitative age-determinations of geomorphic surfaces. Some surface exposure dating methods are numerical, including the accumulation of cosmogenic radionuclides ¹⁰Be, ¹⁴C, ²⁶Al, ³⁶Cl, and ⁴¹Ca, accumulation of cosmogenic stable nuclides ³He and ²¹Ne, ¹⁴C dating of organic matter encapsulated in rock coatings, and dendrogeomorphology. Calendar ages are obtained by dendrogeomorphological analysis. Calibrated ages can be obtained by analysis of rock-varnish chemistry, lichenometry, weathering, and soils. Various methods can be used in combination to overcome individual limitations. Whereas conventional methods provide age control on stratigraphic profiles, surface-exposure dating methods are especially suitable for geographic problems, such as analyzing not only temporal, but also spatial variations in the rates of geomorphic processes. [Key words: geomorphology, process, geochronology, cosmogenic nuclides, Quaternary, surface exposure dating, rock varnish, weathering, soils.]  相似文献   

中国地质调查信息网格平台的分布式空间数据服务技术     

吕霞  李丰丹  李健强  耿燕婷  宋苗苗  万林 《地质通报》2012,31(9):1520-1530

通过对中国地质调查信息网格平台中分布式空间数据服务关键技术的研究,提出了一套有效的空间数据共享与服务解决方案,并以全国重要矿产资源潜力预测评价网格应用示范为例,介绍了该方案的具体实施与应用过程。  相似文献   

褶皱相关断裂构造形成条件与发育机制:燕山中部露头尺度变形研究为例   总被引：1，自引：1，他引：0       下载免费PDF全文

邓洪旦  张长厚  邓洪菱  欧阳嘉穗 《地学前缘》2012,19(5):61-75

总结了褶皱相关断裂发育机制的3个构造几何学模型:同心圆褶皱模型、膝折带褶皱模型和弯流褶皱模型。基于燕山中部中、新元古界地层中发育的5个露头尺度褶皱及其中、小型断裂构造的实例剖析,探讨了收缩变形过程中褶皱与断裂构造发育时序与褶皱相关断裂构造的产生机制。研究指出,规模与所在褶皱构造相当或略小的断裂构造当中,既有形成时间早于褶皱变形的断层,也有在褶皱变形过程中调节褶皱不同部位应变差异的褶皱相关断裂构造,而且卷入后期变形的早期断裂可能成为制约褶皱成核位置的影响因素,以及成为枢纽叠覆楔构造的形成方式之一。断层位移-距离曲线特征和断层与褶皱变形几何学、运动学关系分析,可用来判断断层、褶皱变形发生相对时序。认为影响褶皱相关断裂构造发育的机制主要有3种:(1)纵弯滑褶皱作用中,翼部顺层滑动受到限制而无法持续时,将通过断层向上切层的方式予以调节,从而形成翼部或转折端揳入逆冲断裂以及背离向斜和指向背斜逆冲断层;(2)各种因素导致的褶皱曲率变化是褶皱相关断裂产生的重要机制之一,褶皱曲率变化可由褶皱轴面的合并和新生直观反映,轴面合并引起褶皱曲率变化的层位,可能是诱发褶皱相关断裂,如背离向斜和指向背斜逆冲构造开始产生的重要部位;(3)能干性差异和强硬层之间距离较大的岩层组合发生纵弯褶皱变形时,软弱岩系在褶皱核部的聚集和逃逸,是迫使递进收缩的强硬层产生褶皱相关断裂构造的重要机制。  相似文献   

Study on Fractal Feature of Fault Structure and Its Geological Implications Based on Remote Sensing——A Case Study of Jiuyi Mountain Area, Southern Hunan     

LEI Tianci  CUI Fang  YU Fengmin  XU Honggen 《地质论评》2012,58(3)

以九嶷山地区ETM+遥感影像数据为信息源,通过信息提取与解译快速获取该区断裂构造.运用分形理论的盒维数法对断裂构造体系进行分形研究,结果表明,区内断裂构造在0.05～2.75km尺度范围内具有良好的自相似性和分形特征,总体分维值D=1.1155、R2=0.9964,分维值接近中国大地构造单元稳定区分维值;不同走向断裂分维值D在0.9184～1.0441间、R2介于0.9983 ～0.9996间,各分维值D不仅定量描述了各走向断裂分布的复杂性和构造演化的成熟度,而且还反映了断裂的成矿作用:NE向断裂分维值最大,D值在1.0441附近时主要表现为导矿构造;SN向断裂分维值次之,D在0.9870附近时主要表现为控矿构造;NW向断裂分维值偏小,D在0.9502附近时主要表现为含矿构造.  相似文献