Editing Geocode (section)

== Classification ==
[[File:Geocode-exemple1-MASP.png|thumb|420px|
Geocode cells of [[Geohash]], with 8 (blue) and 9 (yellow) digits, a typical ''hierarchical grid'', comparing with [[latitude-longitude]] (12 or more digits). A [[São Paulo Museum of Art|museum]] is a typical location to be pointed by a geocode, its gate need ~20 meters of precision.
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There are some common aspects of many geocodes (or [[#Geocode_system|geocode systems]]) that can be used as classification criteria:
* ''Ownership'': proprietary or [[public domain|free]], differing by its [[licence]]s.
* ''Formation'': the geocode can be originated from a name (ex. abbreviation of official name the country) or from mathematical function ([[data compression|encoding]] algorithm to compress [[latitude-longitude]]). See ''geocode system'' types below (of [[#Systems of standard names|names]] and of [[#Systems of regular grids|grids]]).
* ''Hierarchy'': geocode's syntax hierarchy corresponding to the spatial hierarchy of its represented entities. A geocode system can hierarchical ([[#Hierarchical_naming|name]] or [[#Hierarchical_grids|grid]]) or non-hierarchical.
* ''Covering'': global or partial. The entities (represented by the geocodes) are in all globe (e. g. geographical points) or is delimited the theme (e.g. only terrestrial areas) or by the ownership's jurisdiction (e.g. only into a country).
*  ''Type of the represented entity'': [[Well-known text representation of geometry|type of geometry]]. Point (the geocode can be translated to a [[Geo URI]]), grid cell (the geocode system is related with a [[discrete global grid|DGG]]) or polygon (typically administrative boundaries delimitations).
<!-- ** grids can be also classified as [[Discrete global grid#Hierarchical grids|''hierarchical'']] or  [[Discrete global grid#Non-hierarchical grids|''non-hierarchical'']]-->
** special hierarchical grids, with global covering and equal-area cells, can be classified as ''DGGS cell''<ref name="DGGS2017">The OGS's standard "[https://docs.opengeospatial.org/as/15-104r5/15-104r5.html Discrete Global Grid Systems]" definition.</ref>
** some non-standard geographic entities, can be classified also by its [[Coordinate system|coordinate system and elipsoid of reference]] (e.g. [[Universal Transverse Mercator coordinate system|UTM]]). The [[de facto standard|''de facto'' standard]] is the [[WGS84]].<ref>For internet formats and protocols, the [[WGS84]] is ''de facto'' and [[De jure|''de juri'']] standard: see [[geo URI]] protocol, [[GeoJSON]], [[Geography Markup Language|GML]] and [[Keyhole Markup Language|KML]] formats.</ref>
* ''Scope of use'': general use vs specialized (e.g. airport geocodes).
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Grids have also some tradition in more specific classifying: DGGS is (hierarchical+grid+global+equalArea) ... DGG is (grid+global) ... 
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