利用服务共享实现城市异构GIS系统互操作是解决互操作问题的一个新思路。本文首先分析了开放地理信息系统联盟(OGC Open GIS Consortium)的互操作模型(OWS Open GIS Web Service)的框架结构以及服务协作,然后以模型框架中的一个基本数...利用服务共享实现城市异构GIS系统互操作是解决互操作问题的一个新思路。本文首先分析了开放地理信息系统联盟(OGC Open GIS Consortium)的互操作模型(OWS Open GIS Web Service)的框架结构以及服务协作,然后以模型框架中的一个基本数据服务———地图要素服务(Web Feature Service)为例,详细介绍了利用服务共享实现城市异构GIS数据共享与互操作的具体开发过程,最后对该模式的应用前景进行了分析。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
首先,利用倾斜摄影与重点区域工程实景建筑信息模型(Building Information Modeling,BIM)建模,结合地理信息系统(Geographic Information System,GIS)数据处理构建数字地形。其次,脱密已有景区数据,对脱密后的景区基础空间数据进行处理...首先,利用倾斜摄影与重点区域工程实景建筑信息模型(Building Information Modeling,BIM)建模,结合地理信息系统(Geographic Information System,GIS)数据处理构建数字地形。其次,脱密已有景区数据,对脱密后的景区基础空间数据进行处理、入库、制作专题图以及构建空间服务,脱密后的景区空间要素对象经过数据平台数据治理,作为符合开放地理空间信息联盟(Open Geospatial Consortium,OGC)标准的空间服务进行发布。最后,综合展示模块通过图层控制功能自主选择空间服务于一张图中叠加展示,实现智慧旅游平台集浏览、查询、统计、分析于一体的二三维一体化综合展示模型研究。展开更多
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 HydrlS （ Hydroge...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 HydrlS （ Hydrogeological Information System） based on Open Source components and technologies, leading to a feasible and low-cost solution. Therefore, HydrlS 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.展开更多
文摘利用服务共享实现城市异构GIS系统互操作是解决互操作问题的一个新思路。本文首先分析了开放地理信息系统联盟(OGC Open GIS Consortium)的互操作模型(OWS Open GIS Web Service)的框架结构以及服务协作,然后以模型框架中的一个基本数据服务———地图要素服务(Web Feature Service)为例,详细介绍了利用服务共享实现城市异构GIS数据共享与互操作的具体开发过程,最后对该模式的应用前景进行了分析。
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.
文摘首先,利用倾斜摄影与重点区域工程实景建筑信息模型(Building Information Modeling,BIM)建模,结合地理信息系统(Geographic Information System,GIS)数据处理构建数字地形。其次,脱密已有景区数据,对脱密后的景区基础空间数据进行处理、入库、制作专题图以及构建空间服务,脱密后的景区空间要素对象经过数据平台数据治理,作为符合开放地理空间信息联盟(Open Geospatial Consortium,OGC)标准的空间服务进行发布。最后,综合展示模块通过图层控制功能自主选择空间服务于一张图中叠加展示,实现智慧旅游平台集浏览、查询、统计、分析于一体的二三维一体化综合展示模型研究。
文摘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 HydrlS （ Hydrogeological Information System） based on Open Source components and technologies, leading to a feasible and low-cost solution. Therefore, HydrlS 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.
