面向服务的地理信息公共服务平台研究     

李宗华  彭明军  樊玮 《测绘软科学研究》2010,(4):12-17

信息技术的日益发展,使得异构信息资源不断涌现,如何将这些异构信息进行集成成为迫切需要解决的问题。为了解决异构地理空间信息源的共享问题,本文研究了一种面向服务的地理信息共享模式,采用符合OGC标准的WFS、WMS等建立各种标准的服务,使得用户不但可以在网络上方便地调用各种地理空间信息,还可以通过标准的接口将各种标准的数据服务和功能服务与自己的应用系统进行集成,以及将来自不同软件提供的接口的数据进行共享。以武汉市为例,开发并实现了面向服务的地理空间信息公共服务平台,说明了通过标准的服务接口访问服务的方法,该平台在武汉市政务专网上得到了广泛应用。  相似文献   

面向电网规划的GIS集成应用平台     

王韦  颜炯  刘秀坤 《地理空间信息》2012,10(5):93-95,98

针对电网规划的特点和需求,实现了一个面向电网规划的GIS集成应用平台。分析了基于GIS技术的电网规划平台系统结构,介绍了平台实现中的功能,并讨论了面向服务架构的电网规划服务集成技术,最后详细介绍了平台对电网规划过程的支持作用。  相似文献   

Stratigraphic architecture and infill history of a deglaciated bedrock valley based on georadar, seismic profiling and drilling     

LOUISE HANSEN  ACHIM BEYLICH  VALENTIN BURKI†  RAYMOND S. EILERTSEN‡  OLA FREDIN  EILIV LARSEN  ASTRID LYSÅ  ATLE NESJE†  KNUT STALSBERG  JAN F. TØNNESEN  Associate Editor – Nick Eyles 《Sedimentology》2009,56(6):1751-1773

The sediment fill of a silled bedrock valley in Western Norway has been investigated with respect to stratigraphy and infill history using a combination of mapping, georadar, seismic profiling and drilling. A small outlet glacier occupies the head of the valley that displays a stepwise down-valley profile and terminates in a lake at 29 m above sea-level. The valley is surrounded by high, steep bedrock slopes and is characterized by a series of filled basins each limited by sills of bedrock or moraine accumulations. Till, glacial outwash and/or rockslide deposits fill in the lower half of the two larger basins. (Fan) delta deposits fringed by the deposits of alluvial fans and colluvial cones dominate the upper fill of most basins. (Fan) delta deposits interfinger downstream with lake sediments in the larger basins and fluvial deposits comprise the top fill. The overall infill pattern was controlled by deglaciation as well as basin size and shape. An overall decreasing sediment supply following deglaciation is shown in the fill of a larger basin down-valley, whereas a recently increasing sediment supply during glacier growth is reflected primarily in an upstream basin. Only the lowermost basin was exposed to a sea-level drop from 75 m above sea-level to the present lake level associated with incision and river migration. This observation is in contrast to the basins above marine influence where incision has been limited due to fixed downstream sills resulting in insignificant erosion except for some fan-head entrenchment. It follows that the fills of these small valley basins display progradational and aggradational trends of deposition and paraglacial reworking has been limited. Additionally, the study demonstrates that georadar profiling, combined with other methods, is very useful for comprehensive investigation of valley basins.  相似文献   

基于欧拉数的地籍拓扑关系计算   总被引：2，自引：0，他引：2  

周晓光  陈军  李志林  赵仁亮 《测绘学报》2006,35(3):291-298

地籍实体间的空间拓扑关系是地籍信息系统时空数据组织与查询、空间数据质量控制、空间数据更新处理等的基础,然而现有拓扑关系模型在计算地籍实体间的拓扑关系方面存在不足。本文提出了一种基于目标整体交/差和欧拉数的地籍实体拓扑关系计算方法,其将目标看作一个整体,用目标整体间∩(交)、\(差)两个集合操作的结果来区分目标之间的拓扑关系,结果的取值包括内容、维数和欧拉数三个拓扑不变量。研究工作表明本文所提出的拓扑关系模型克服了现有拓扑关系模型在描述地籍实体间拓扑关系方面存在的不足,并且其已成功地应用到地籍空间数据更新处理中。  相似文献   

Topological relations between spherical spatial regions with holes     

Jingwei Shen  Lan Zhang 《International Journal of Digital Earth》2020,13(4):429-456

ABSTRACT

There is growing interest in globally modelling the entire planet. Although topological relations between spherical simple regions and topological relations between regions with holes in the plane have been investigated, few studies have focused on the topological relations between spherical spatial regions with holes. The 16-intersection model (16IM) is proposed to describe the topological relations between spatial regions with holes. A total of 25 negative conditions are proposed to eliminate the impossible topological relations between spherical spatial regions with holes. The results show that (1) 3 disjoint relations, 3 meet relations, 66 overlap relations, 7 cover relations, 3 contain relations, 1 equal relation, 7 coveredBy relations, 3 inside relations, 1 attach relation, 52 entwined relations, and 28 embrace relations can be distinguished by the 16IM and that (2) the formalisms of attach, entwined, and embrace relations between the spherical spatial regions without holes based on the 9IM and that between the spherical spatial regions with holes based on the simplified 16IM are different, whereas the formalisms of other types of relations between spherical spatial regions without holes based on the 9IM and that between the spherical spatial regions with holes based on a simplified 16IM are the same.  相似文献   

MDA在农业GIS应用系统构建中的应用研究     

单东方  潘瑜春  周艳兵 《地理信息世界》2011,(4):81-86

随着GIS在农业领域应用的不断深入,农业GIS应用系统的开发也朝着具体、复杂和专业化方向发展.针对目前农业GIS应用系统开发中存在的概念模型、数据模型、元数据标准不统一、数据库整合性差等不足,本文通过分析MDA架构体系及开发流程,结合软件复用思想和MDA方法,提出一种基于MDA的农业GIS应用系统开发构建方式,阐述了空...  相似文献   

电子政务顶层设计方法研究   总被引：1，自引：0，他引：1  

金江军 《国土资源信息化》2011,(4):3-5,36

人们对电子政务顶层设计的重要性已经达成广泛共识。本文首先介绍了美国、英国、德国、新加坡的电子政务顶层设计进展,然后设计了电子政务总体框架,该框架由业务架构、服务架构、应用架构、信息架构、技术架构、管理架构六个部分构成。最后提出了电子政务顶层设计推进策略,指出了顶层设计与规划的区别。  相似文献   

时空一体化数据的TGIS设计的初步探讨     

陈晋  史培军  李京 《遥感学报》1995,(2)

在大量调研国外有关文献的基础上，对受到国际ＧＩＳ领域的高度重视的时空一体化数据的地理信息系统ＴＧＩＳ（ＴｅｍｐｏｒａｌＧｅｏｇｒａｐｈｙＩｎｆｏｒｍａｔｉｏｎＳｙｓｔｅｍ）的概念模式、数据模型与功能设计等问题进行了分析，认为建立在时空拓扑结构基础上，具有时空数据管理、查询、时间维数据整合和内插、时序及时空分析工具、可视化操作等功能的ＴＧＩＳ将是未来ＧＩＳ发展的趋势，它将极大地促进ＧＩＳ在应用领域的广度和深度。  相似文献   

利用一维资料重现n维系统吸引子结构的试验   总被引：1，自引：0，他引：1  

朱焰宇  林振山 《热带气象学报》1997,13(1):68-74

以Ｒｏｓｓｌｅｒ系统和Ｌｏｒｅｎｚ系统为例，研究了利用单变量时间序列来重现ｎ维动力吸引子的枯朴结构，研究结果表明，在一维时间序列重建的相空间里，存在着若干个主矢量，这些主矢量可以从某一侧面揭示出系统吸收子的枯扑系统。  相似文献   

中国虚拟天文台体系结构   总被引：2，自引：2，他引：0  

崔辰州  赵永恒 《天文研究与技术》2004,1(2):140-151

虚拟天文台是天文技术和信息技术结合的产物，其体系结构体现着与最新信息技术的结合。本文首先介绍虚拟天文台的工作流程和原理，进而介绍了虚拟天文台体系结构研究的最新进展。以网格技术为基础，给出了中国虚拟天文台的层次式体系结构和服务式体系结构。  相似文献