To publish data on the Web, we first have to identify the items of interest in our domain (e.g., those relevant concepts, topics, events, phenomena, features, datasets, applications, and services). They are the things whose properties and relationships we want to describe in the data. In Web Architecture terminology, all items of interest are called resources.
The GeoPlatform aggregates, indexes, and links resources of the National Spatial Data Infrastructure (NSDI) to facilitate public and cross-government sharing, discovery, and access, of curated collections of authoritative and other relevant geospatial data. These are the things we are interested in curating, finding, and accessing. The “GeoPlatform Portfolio” is a collection of geospatial resources that have been registered and curated with the GeoPlatform for rapid access and use. The GeoPlatform Portfolio is composed of “assets” of various types, interrelationships, and roles.
The GeoPlatform Portfolio is managed as Linked Data on the Web. Linked Data enables people to share structured data and other related resources on the Web as easily as they can share documents today. The term Linked Data was coined by Tim Berners-Lee in his Linked Data Web Architecture note. The term refers to a style of publishing and interlinking structured data on the Web. The basic assumption behind Linked Data is this: the value and usefulness of data increases the more it is interlinked with other data. In summary, Linked Data is simply about using the Web to create typed links between data from different sources so that relevant data can be more easily found, accessed, and exploited. This is what the GeoPlatform does.
Follow these references for more information about Linked Open Data, the Semantic Web, and publishing and curating spatial resources in the Web.
These are the core business objects of the GeoPlatform Portfolio, representing geospatial resources that are curated, linked, discovered, and ultimately accessed online by individuals and software applications.
Portfolio Assets may be linked to individuals in citations (e.g., cited author or contributor), as points-of-contact (e.g., service-desk support), and other roles. Portfolio Assets are linked to Concepts so that the purpose and “fit-for-use” (i.e., the meaning, significance, and function) of an asset can be more specifically defined by producers and determined by consumers. Concepts are most useful when they are defined by authoritative or “controlled” vocabularies, generically called “Concept Schemes”.
These important web resources can be used to further describe, represent, and organize GeoPlatform Portfolio Assets:
To learn more about the concepts behind and promise of the Semantic Web, Linked Open Data, and Spatial Data in the Web, follow these links…
- Building the Web of Data (and things)
- Tim Berners-Lee TED Talk (Video) on Linked Open Data
- Linked Open Data (LOD) tenets and standards
- W3C Data Activities
- W3C Linked Data Standards
- Tim Berners-Lee Linked Data Design Issues
- W3C Data on the Web Best Practices
- Spatial Data in the Web
- W3C Spatial Data on the Web: Use Cases and Requirements
- W3C Spatial Data on the Web Best Practices
More information about the GeoPlatform Portfolio and the Portfolio Model can be found here:
- The GeoPlatform Portfolio and Portfolio Model