Feature data

In geographic information systems, a feature is an object that can have a geographic location and other properties.[1] Common types of geometries include points, arcs, and polygons. Carriageways and cadastres are examples of feature data. Features can be labeled when displayed on a map.

Feature types

The definition of features that share membership of a common theme is a feature type, though there are a number of terms for this characteristic, including category, feature class, group, layer, level, object, and theme.

Layer served as the traditional term of choice, but use of this word has declined as data has become more object-oriented and less concerned with cartographic layering.

Data modelers can use feature types to create a hierarchical structure. For example, a dataset may consist of types called highways, streets and lanes. The system may group these particular types together under a category called "Roads".

gollark: Arbitrary, but really convenient, and stop saying "lock".
gollark: Actually, let's just make time begin with the Unix epoch.
gollark: If you want mildly less arbitrary, why not... base it on the Moon landings or something?
gollark: If you're adding 10000 to the existing system it's basically based on Jesus but offset a round number.
gollark: Well, yes, the fact that our calendar is based around the Jesus thing isn't really ideal, but there aren't exactly many better ones.

See also
  • Feature class

References
  1. "GML Simple Features Profile". OGC. Retrieved 11 July 2011.


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