Spatial Data Infrastructure

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Spatial Data on the Internet

In more recent definitions of SDI it translates into "Spatial Data on the Internet". The main reason for this slight shift in perspective is that there is no reason to try and define a separate infrastructure for spatial data if a perfectly well organized infrastructre is already in place (the Internet and the Web).

Legacy Definitions

The legacy definition of a Spatial Data Infrastructure (SDI) is an infrastructure to provide interactively connected access to spatial data and metadata using software tools. Modern SDIs are typically implemented as interoperable Web services which are designed as resources. In the resource oriented paradigm the interaction occurs by exchanging stateless representations of the resources.

In broader definitions an SDI as the sum of the technology, policies, standards, human resources, and related activities necessary to acquire, process, distribute, use, maintain, and preserve spatial data. Kuhn (2005) defines an SDI is a coordinated series of agreements on technology standards, institutional arrangements, and policies that enable the discovery and use of geospatial information by users and for purposes other than those it was created for.

Application of SDI Design