针对林业资源管理决策系统中资源信息可重用性、异构系统互操作性及空间分析能力等方面的不足,论述了网络地理信息系统(GIS based on internet,Web GIS)和开放地理信息系统协会(Open GIS Consortium,OGC)的地理信息Web服务规范,然后对基...针对林业资源管理决策系统中资源信息可重用性、异构系统互操作性及空间分析能力等方面的不足,论述了网络地理信息系统(GIS based on internet,Web GIS)和开放地理信息系统协会(Open GIS Consortium,OGC)的地理信息Web服务规范,然后对基于Web GIS和OGC规范的林业资源管理决策系统进行了设计和实现,并以北京市大兴区林业资源管理为例,将建立基于Web GIS和OGC规范的林业资源管理决策系统进行了应用。该系统具有良好的异构系统互操作性,实现不同来源数据的访问与集成,为数据提供者和数据需求者搭建起沟通的桥梁。展开更多
An implementation of the Open Geospatial Consortium Web Feature Service (WFS) and Web Map Service (WMS) specifications in an open source desktop GIS is presented together with a discussion of considerations for improv...An implementation of the Open Geospatial Consortium Web Feature Service (WFS) and Web Map Service (WMS) specifications in an open source desktop GIS is presented together with a discussion of considerations for improving the use of web services data in desktop applications. In our implementation, WFS and WMS services are consumed by a plug-in to MapWindow GIS [1], allowing the end user to view WFS, WMS and ArcIMS data, including data from the ESRI Geography Network, in a transparent manner that can be configured for either data analysis and modeling, or data visualization. This implementation in an open source GIS allows for others to view and use the code, improve it, and otherwise implement the suggested considerations in other GIS platforms. Specific considerations proposed here include: pre-fetching through envelope optimization, tile display, and feature complexity reduction. These strategies improve the speed and responsiveness with which data can be viewed and analyzed. Comparisons made with other web-based data access implementations are used to evaluate whether these techniques provide performance benefits, and under which circumstances.展开更多
Google Maps的Ajax客户端为WebGIS开发提供了新思路。该文从3方面讨论了Ajax在WebGIS中的应用。在原理方面,通过分析Ajax模型和Google Maps,阐述了Ajax方法与OGC规范相结合的客户端模式;在实现环节,以MapBuilder为例分析了Ajax客户端的...Google Maps的Ajax客户端为WebGIS开发提供了新思路。该文从3方面讨论了Ajax在WebGIS中的应用。在原理方面,通过分析Ajax模型和Google Maps,阐述了Ajax方法与OGC规范相结合的客户端模式;在实现环节,以MapBuilder为例分析了Ajax客户端的实现模式及功能扩展方法;在应用方面,介绍了基于GeoServer和Map-Builder实现的淮河流域水环境信息网络查询原型系统实例。展开更多
论述了目前万维网地理信息系统(WebGIS)的几种实现方案,认为传统的基于HTTP协议的客户机/服务器结构,限制了WebGIS的性能,提出了一种基于浏览器应用程序通用高效的架构,这种架构把Ajax(Asynchronous JavaScript And XML)模型整合到了Web...论述了目前万维网地理信息系统(WebGIS)的几种实现方案,认为传统的基于HTTP协议的客户机/服务器结构,限制了WebGIS的性能,提出了一种基于浏览器应用程序通用高效的架构,这种架构把Ajax(Asynchronous JavaScript And XML)模型整合到了WebGIS应用系统中,解决了传统WebGIS响应速度慢、刷新滞缓等问题。展开更多
文摘针对林业资源管理决策系统中资源信息可重用性、异构系统互操作性及空间分析能力等方面的不足,论述了网络地理信息系统(GIS based on internet,Web GIS)和开放地理信息系统协会(Open GIS Consortium,OGC)的地理信息Web服务规范,然后对基于Web GIS和OGC规范的林业资源管理决策系统进行了设计和实现,并以北京市大兴区林业资源管理为例,将建立基于Web GIS和OGC规范的林业资源管理决策系统进行了应用。该系统具有良好的异构系统互操作性,实现不同来源数据的访问与集成,为数据提供者和数据需求者搭建起沟通的桥梁。
文摘An implementation of the Open Geospatial Consortium Web Feature Service (WFS) and Web Map Service (WMS) specifications in an open source desktop GIS is presented together with a discussion of considerations for improving the use of web services data in desktop applications. In our implementation, WFS and WMS services are consumed by a plug-in to MapWindow GIS [1], allowing the end user to view WFS, WMS and ArcIMS data, including data from the ESRI Geography Network, in a transparent manner that can be configured for either data analysis and modeling, or data visualization. This implementation in an open source GIS allows for others to view and use the code, improve it, and otherwise implement the suggested considerations in other GIS platforms. Specific considerations proposed here include: pre-fetching through envelope optimization, tile display, and feature complexity reduction. These strategies improve the speed and responsiveness with which data can be viewed and analyzed. Comparisons made with other web-based data access implementations are used to evaluate whether these techniques provide performance benefits, and under which circumstances.
文摘论述了目前万维网地理信息系统(WebGIS)的几种实现方案,认为传统的基于HTTP协议的客户机/服务器结构,限制了WebGIS的性能,提出了一种基于浏览器应用程序通用高效的架构,这种架构把Ajax(Asynchronous JavaScript And XML)模型整合到了WebGIS应用系统中,解决了传统WebGIS响应速度慢、刷新滞缓等问题。
