Putting it All in Context Web Map Context Documents Tom Kralidis把它在上下文的We地图上下文文件汤姆kralidis.docVIP

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Putting it All in Context Web Map Context Documents Tom Kralidis把它在上下文的We地图上下文文件汤姆kralidis.doc

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Putting it All in Context Web Map Context Documents Tom Kralidis把它在上下文的We地图上下文文件汤姆kralidis

Tom Kralidis Systems Scientist GeoAccess Division, Canada Centre for Remote Sensing 650-615 Booth Street Ottawa, ON, K1A-0E9 Canada tom.kralidis@ccrs.nrcan.gc.ca December 2002 Introduction The concept of Geospatial Data Infrastructures (GDI) and distributed geospatial processing has brought about new and exciting opportunities for data access, discovery and visualization. The growth and ubiquity of the Internet has enabled many interesting uses and applications of geospatial information. In fact, geospatial information is gaining momentum as ubiquitous, all-purpose information holdings for government, industry and academia. The Canadian Geospatial Data Infrastructure (CGDI) is a Canadian public sector led initiative to ‘put Canada’s geographic information on the Internet’. The OpenGIS Consortium (OGC) represents a collaborative approach to the definition, development and publication of geospatial processing services through distributed networks. Many GDIs are leveraging these efforts in implementing and publishing online services to provide maps and geospatial data through such technologies as Web Map Service (WMS) and Web Feature Service (WFS). Organizations are developing web mapping client applications, which connect to these services for dynamic map data and images from distributed servers, which obey the aforementioned specifications. Web Mapping clients benefit from eliminating the need for exhaustive data management budgets, and acquiring up to date geospatial information from its authoritative provider. WMS and WFS are endorsed by the CGDI Architecture Vision [5], the Global Spatial Data Infrastructure (GSDI) Cookbook [2], the former NASA Digital Earth Program, and align with the vision of the OGC Abstract Specification [4]. There currently exists a gap in the concept of web mapping applications of enabling the end user to ‘bookmark’, or save state of, the application in such a way that is transferable to other web mapping applications. Users frequen