9-Lecture16
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NSDI in the Web 2.0 Era<br />
Lecture 16
Contributing Geospatial Data<br />
– NSDI 1.0 – Government plays an important role in<br />
NSDI, especially in countries where surveying and<br />
mapping is strongly controlled by the government<br />
• Private sector has a large variety of data and expertise to<br />
share it as well<br />
– Tele Atlas<br />
– NAVTEQ<br />
– InfoUSA (10 million USA businesses)
Contributing Geospatial Data<br />
– VGI provided by citizens is playing an increasingly<br />
important role<br />
• Wikimapia – 12 million places marked and described by<br />
users
Framework Services and Specialized<br />
Services<br />
• According to WOA/SOA principle, web<br />
services should be aligned with business<br />
functions.<br />
– By adopting this principle, NSDI 2.0 will align the<br />
web services produced by an organization with<br />
the collective needs of the community
Framework Services and Specialized<br />
Services<br />
• A web service should by used not only by the<br />
organization that creates it but also by the<br />
external organization as well
Framework Services and Specialized<br />
Services<br />
• Framework data and web services are<br />
foundation of NSDI. They serve as the<br />
geographic framework, or foundation on<br />
which other datasets can be developed and<br />
referenced.<br />
– Framework data – basic datasets
Framework Services and Specialized<br />
Services<br />
• US framework dataset has seven themes<br />
– Geodetic control<br />
– Ortho-imagery<br />
– Elevation<br />
– Transportation<br />
– Hydrography<br />
– Governmental Units<br />
– Cadastral Information
Framework Services and Specialized<br />
Services<br />
• Making this framework data available as map<br />
and feature web services will eliminate a lot of<br />
cost of redundant data collecting and provide<br />
the opportunity for web application that will<br />
cut across government and societal needs.
Framework Services and Specialized<br />
Services
Hosting vs Outsourcing
Hosting vs Outsourcing
Hosting vs Outsourcing
Issues with Today’s Geospatial Web<br />
Services<br />
• Fully functional national framework services<br />
are not yet in place.<br />
• Many web services are difficult to consume<br />
• The performance of many services is slow<br />
• Sharing in still limited
Assembling Web Services<br />
• Discovering needed services – findability<br />
• Taking advantage of Cloud GIS Services
Assembling Web Services<br />
• Using web services to build applications
Assembling Web Services<br />
• Using Geobrowsers to assemble web services
Reading Assignment<br />
• Challenges and Prospects<br />
– Page 194-196
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