共查询到18条相似文献，搜索用时 109 毫秒
1.
2.
网络地图服务(WMS)是基于开放地理信息系统协会(OGC)规范的在线地图服务,通过WMS可以实现多源异构地理空间数据的转换和封装,Internet上现在发布了越来越多的WMS服务。本文研究WMS网络地图服务的查找方法和组合使用的方法,用户通过组合网络WMS服务和自定义服务既可满足应用需求,又可达到快速开发应用的目的。 相似文献
3.
4.
WMS的自定义地图服务聚合技术研究 总被引：1，自引：0，他引：1
针对网络地图服务资源多样化及其共享开放性的特点和WMS服务资源多但实际使用者少的缺点,研究了一种聚合WMS服务的使用方法,使得用户可以根据需求自由组合WMS服务提供的地图资源,从而产生满足用户需求的地图服务聚合应用.通过研究服务信息获取验证和服务聚合操作可视化等关键技术,实现了基于WMS地图服务的聚合应用系统. 相似文献
5.
将网格技术应用于地理信息领域,构建实现地理信息资源共享与协同工作的网格地理信息系统,是目前地理信息行业研究的热点之一。OGC制定的网络服务规范作为得到广泛支持的地理空间数据互操作规范。与网格技术的相关规范存在许多不兼容之处,使得OGC服务在网格体系下难于集成和管理。文章研究了OGC数据服务WMS,WFS和wCS的相关规范和OGSA—DAI网格中间件技术,提出将OGC数据服务扩展为OGSA—DAI的数据资源的方案,将WMS,WFS和WCS封装为符合WSRF的网格资源,实现分布式异构地理空间数据在OGSA—DAI框架下的访问、集成与管理。此方案提供了一种将OGC服务集成到网格环境中的方法,比较容易实现,对相关研发工作的开展具有很好的借鉴作用。 相似文献
6.
7.
8.
9.
在高标准农田项目建设中,因项目多、资料类型多、资料空间范围重叠,传统瓦片地图服务无法满足在线统一管理资料的需求。针对该问题,本文基于标准瓦片地图服务,设计了一种"复合型"瓦片地图服务,将全省项目的各种资料瓦片集中发布,解决其在线统一管理问题。 相似文献
10.
提出了一种在客户端用金字塔模型建立WMS服务地图图像的本地缓存的方法,利用了GeoGlobe平台集成deegree 2.1-rc1的WMS服务,实现了在三维客户端环境中快速多分辨率动态显示的效果. 相似文献
11.
A regional groundwater management system has been elaborated, integrating Relational Database Management System (RDBMS) and various web services. It consists of web geospatial application so-called HydrIS (Hydrogeological Information System) based on Open Source components and technologies, leading to a feasible and low-cost solution. Therefore, HydrIS permits delivery of data from a number of heterogeneous sources to standards supported by the Open Geospatial Consortium (OGC). The protocols used for exchanging data are also derived from OGC standards, i.e., WMS (Web Mapping Service), WFS (Web Feature Service), and WCS (Web Coverage Service). Finally, a geoportal was developed, which consists of client-applications that communicate with different Web Services (WMS, WCS, and WFS) through http-requests. 相似文献
12.
OGC组织的WMS规范提供了一种空间数据发布的通用方法,但是它依赖于特定空间数据发布格式,需要对于数据包含的地学信息进行复杂的预先整理,这和目前广泛使用的地学数据存档和交换数据格式之间存在较大的差距。文章提出了一种常用空间数据向WMS发布格式的自动化动态映射模型,构建了基于MapServer和0per-Layers的空间数据对象的动态WMS发布技术原型,实现了包含遥感数据、GIS数据、行业数据等常规空间数据在WMS环境下的自动化动态发布和显示,并进行了相关的实验验证工作。 相似文献
13.
《制图学和地理信息科学》2013,40(4):269-283
Many time-critical applications such as emergency response, location-based services, and real time traffic management need instant access to diverse data to make quick decisions and take instantaneous actions. However, two issues block time-critical applications to quickly acquire and integrate spatial data over the web: (1) the heterogeneity of existing GIS systems, and (2) the file-level data sharing systems over the web. This research examines current open standards, protocols, and technologies capable of solving the two issues for real-time spatial data sharing over the web. Focusing on investigating the role of Web Feature Services (WFS) and Web Map Services (WMS), this research has developed a solution for real-time geospatial data sharing at the feature level over the web. A prototype has been implemented to query, extract, create, delete, update, and map geographic features stored in web-accessible OGC (Open Geospatial Consortium) simple feature datastores for transportation emergency applications. The prototype results show that the OGC WFS and WMS play important roles in real-time geospatial data sharing and exchange from heterogeneous sources at the feature level for time-critical applications. The WFS and WMS eliminate time-consuming data translation and facilitate reuse of existing geospatial data over the web. Several issues related to the solution are also discussed in the paper. 相似文献
14.
HydrIS:一个用于地下水管理的开放的GIS决策支持系统——以Morocco为例(英文) 总被引：1，自引：0，他引：1
A regional groundwater management system has been elaborated, integrating Relational Database Management System (RDBMS) and
various web services. It consists of web geospatial application so-called HydrIS ( Hydrogeological Information System) based
on Open Source components and technologies, leading to a feasible and low-cost solution. Therefore, HydrIS permits delivery
of data from a number of heterogeneous sources to standards supported by the Open Geospatial Consortium (OGC). The protocols
used for exchanging data are also derived from OGC standards, i.e., WMS (Web Mapping Service), WFS (Web Feature Service),
and WCS (Web Coverage Service). Finally, a geoportal was developed, which consists of client-applications that communicate
with different Web Services (WMS, WCS, and WFS) through http-requests.
A prototype for web-based GIS application was designed using the deegree Framework to provide systematic interfaces and functions.
This system was developed to demonstrate the value of making hydrogeological data more widely accessible through client/server
architecture. This experience and knowledge already gained in this project will be a source for technology transfer and policy
decisions. Otherwise, this will enable user groups to improve the management of their groundwater resources and contribute
to enhanced decision support capabilities.
相似文献
15.
16.
17.
Requirements for Next Generation Spatial Data Infrastructures-Standardized Web Based Geoprocessing and Web Service Orchestration 总被引：2，自引：0，他引：2
Spatial Data Infrastructures (SDI) have been widely accepted to exchange geospatial data among organizations. Today SDIs main focus lies on the provision of geospatial data in the form of distributed spatial web services, the retrieval through catalogues, and visualization in the form of Web Map Services (WMS). The hypothesis presented in this paper takes SDI's one step further by providing a method to process geodata in an Open Geospatial Consortium (OGC) compliant way into information. Two case studies present the potential of standardized geoprocessing services. In addition, this paper addresses the problem of service chaining by providing a system architecture to implement complex geoprocessing models and workflows based on web services using Web Service Orchestration (WSO). The proposed methods utilize spatial standards provided by OGC, the International Organization for Standardization (ISO) and ‘mainstream IT’ standards provided by the World Wide Web Consortium (W3C) and the Organization for the Advancement of Structured Information Standards (OASIS) to establish a generic web service architecture for providing common geoprocessing capabilities (e.g. spatial algorithms, map algebra, etc.) for usage in SDIs. 相似文献
18.
在分析了OGC网络服务的不同版本标准和不同服务器实现的差异基础上,提出了一种结合“面向对象思想”和“工厂设计模式”的兼容性解决方案.该方案通过继承抽象的OGC解析器,实现了不同版本标准的WMS解析器,然后结合“工厂设计模式”以实现对不同版本标准的支持;设计了提供扁平化功能的多叉树结构以结合树形图层和一般GIS软件的列表式图层的优势;设计了标准键关键字库以实现对基地址的识别和URL的修正.实现了通过选择高效的序列化器以支持XML文本的高效解析;封装高性能的网络传输工具以支持对服务的高效访问.笔者根据以上设计思路,实现了一个WMS客户端,可支持不同版本、不同厂商开发的WMS服务. 相似文献