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: I think that if your system can't be deployed without being used everywhere at once, it's utter bees and should not occur.
gollark: Living standards have still consistently increased for pretty much everyone for ages, governments are the ones going to war and covertly operating and you can't really get around this given the existence of scarcity, worldwide extreme poverty is declining and literacy is increasing, etc.
gollark: And yet it somewhat works ish, apparently better than many of the things called "communism" over the æges.
gollark: Such forms of communism seem impräctical.
gollark: Added to my questioning profile.

See also
  • Feature class

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


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.