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feature data
In geographic information systems, a feature is an object that can have a geographic location and other properties.〔(【引用サイトリンク】work=http://www.ogcnetwork.net/?q=gml-sf )〕 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".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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