Concepts of incremental updating and versioning

Abstract

The basic problem being addressed by the Commission is that a user compiles their data base using core data sets from various sources, integrating them together for their particular needs and building their own, value-added data and topology on top. The user’s primary concern is their value-added data, maintaining their integrity, quality and spatial referencing; however, the core data sets provide the crucial spatial framework for the value-added data. Unfortunately, geographical data are dynamic and most suppliers maintain and update their core data sets. Such updates could be: continuous (eg: telemetry), periodic (eg: daily, monthly or annually), part of a planned update cycle (eg: for a national mapping series), when the amount of change or number of errors crosses a threshold, or by special request (eg: to prepare for a census or election).

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