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The data available in the dissemination database is not necessarily the working version from the custodians' point of view. Rather, it is the 'published' version. This is illustrated in Figure 1, where end users and their applications never connect directly to the custodian's version of the data. Instead data is published up into the dissemination area where it can remain consistent (all users get the same data model) and constantly available. This provides a level of security and ensure performance is maintained for the end users (by the provision of powerful dissemination hardware) and the custodian (by protecting them from end user queries).
Figure 1: The Northern Territory Government Spatial Data Infrastructure (NTG SDI)
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The user / password details are given below:
| Database | username | password |
|---|---|---|
| sdb1test | sdb_viewer | viewer |
| sdb1prod | sdb_viewer | viewer |
| nrdbprod | nrdb_viewer | viewer |
Live access
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There are certain cases when information should be used in a live query sense, rather than the traditional download-and-store scenario. A good example of this is address searching. Rather than downloading and maintaining a copy of the cadastre in order to implement address searching (geocoding) in an application, it may be better to design the application to make a query to a service for each particular address every time it is required. This ensures the data is always current and removes the need for the application custodian to have to maintain the address dataset.
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