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OpenStreetMap
OpenStreetMap uses its own data model, which is different from any other data model used by Geographic Information Systems (GIS). It uses only three primitive types, combined with a free-form tagging scheme that allows you to describe accurately, virtually any geographic feature. It also describes the topology of the features—how they are connected, and how you move from one to another. This last feature is essential for some applications, particularly routing, but isn't a feature of many traditional GIS'.
In this chapter, we'll look at how OpenStreetMap's systems record the features you draw on the map. In particular, we'll look at:
OpenStreetMap's design goals
The data structures used
The tagging system
The guidelines used by the OpenStreetMap community to make the data as consistent and accurate as possible.
The simplicity of the data model often surprises people coming to OpenStreetMap from a traditional GIS background, who are used...
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